Yamaha eBike Motors: 33 Years, 34 Drive Units

Quick Answer

Yamaha's e-bike motors are made by Yamaha Motor Co., Ltd., of Iwata, Japan, which announced its PAS electric-assist bicycle on July 27, 1993 and had built 5 million drive units by 2019. It sells the PW family to bike makers, builds PAS bikes for Japan, and has owned Brose's motor business, now QORE, since August 1, 2025.

If you ride in the US, one date matters most: Yamaha's US arm, Yamaha Motor Corporation, U.S.A., stopped wholesaling e-bikes at the end of 2024 and promised parts, service and its 5-year limited warranty would continue. Yamaha's newest units, the 48-volt PW-X4 and PW-S3, reach you through other brands' bikes.

In this guide

• How we verified this page
• Who makes Yamaha eBike motors?
• Where are Yamaha e-bike motors made?
• Yamaha's e-bike timeline, 1973 to 2026
• 1988 to 1993: how Yamaha invented the PAS
• The law that shaped the motor: Japan's assist-ratio rule
• 1994 to 2011: the PAS grows up in Japan
• 2012 to 2019: the PW series takes Yamaha to Europe
• 2020 to 2026: lighter units, a French plant, Brose, and a US exit
• Yamaha's e-bike business by the numbers
• Every Yamaha drive unit, 1993 to 2026
• Which Yamaha motor do I have?
• Do Yamaha e-bike motors have torque sensors?
• Which Yamaha motor is best, and for what?
• Yamaha vs Bosch: what the makers' own numbers say
• How fast do Yamaha e-bikes go, and are they legal in the US?
• Are Yamaha e-bike motors reliable? What the record shows
• Concepts and prototypes, 1973 to 2025
• Did Yamaha stop making e-bikes? Yamaha's own bikes, from PAS to the US exit
• Which e-bikes use Yamaha motors?
• Yamaha's milestones, checked against the record
• Yamaha motors on our shelf
• Frequently asked questions about Yamaha e-bike motors
• How we verified this page, in detail
• The source register
• Limitations
• References

How we verified this page

By Milad Ghobadibeygvand, BScN (Western University, 2014), writer and reviewer, Redtail eBikes. Verified October 4, 2026.

Every date, name and figure you read here comes from records read on October 4, 2026: Yamaha's own releases in English and Japanese from 1997 to 2026, its fact books from 2010 to 2026, its catalogs, archived copies of its e-bike website back to September 2013, US patents, Japan's law database, the CPSC and METI recall records, and the documents of Brose and of Yamaha's Berlin subsidiary.

Chart values were read off Yamaha's own pages, every drive-unit figure is the maker's as printed, and translations from Japanese are ours. Full method. If you find an error, write to support@redtailebikes.com.

Who makes Yamaha eBike motors?

Yamaha's e-bike drive units come from Yamaha Motor Co., Ltd., the Iwata company listed in Tokyo as stock 7272 (Integrated Report 2026, page 66), and since August 2025 also from its German subsidiary, Yamaha Motor eBike Systems GmbH. Neither is Yamaha Corporation, the piano maker. The motor on your bike is a PAS, PW or QORE unit.

Yamaha Motor was founded on July 1, 1955, its 2026 fact book records, and an earlier edition describes Nippon Gakki, "founded in 1897, presently Yamaha Corporation," as "the company from which Yamaha Motor was later spun off" (2016 fact book, page 10).

The two have been separate companies ever since; they share the brand and have run joint projects under the banner "Two Yamahas, One Passion" (2015 release). On e-bikes, the 2026 edition says Yamaha "pioneered this product with the 1993 release of the PAS (Power Assist System) model" (fact book, page 13).

The Japanese name you may see on a patent, Yamaha Hatsudoki Kabushiki Kaisha, is the same company; the early PAS patents below are assigned to it.

Three families carry the name today; yours is one of them. PAS is Yamaha's own Power Assist System for complete bicycles sold in Japan. PW is the family of drive units Yamaha sells to other bike makers as e-Kits, first as the PM series in Europe and, from 2013, as the PW series. QORE is the former Brose e-bike business, which Yamaha agreed to buy on March 31, 2025 and runs as Yamaha Motor eBike Systems GmbH.

The QORE site's legal notice names that company, with its registered seat in Düsseldorf (register number HRB 107601) and its business address in Berlin. Brose itself announced the sale on March 31, 2025 and its completion in a release dated "Coburg, 08-01-2025": during an interim period, Brose wrote, the business would keep operating "under the current name BAT GmbH."

Where are Yamaha e-bike motors made?

Yamaha's e-bike drive units are made in Japan, at Morimachi in Shizuoka prefecture, and since March 2024 also in France. Yamaha's 2026 fact book names those two plants for e-Kit drive units: its Morimachi Manufacturing Division and Yamaha Motor Manufacturing Europe S.A.S.

Yamaha's 2026 integrated report adds that in 2025 it "reorganized drive unit production layout by integrating production bases in Taiwan," without naming those plants (Integrated Report 2026, page 34). If your bike has a QORE unit, Yamaha Motor eBike Systems GmbH declares it from its Berlin address.

Morimachi is where the PAS began. At the ceremony for 3 million drive units in April 2015, the head of Yamaha's vehicle and solution business said in his address that "22 years ago, from this factory," the world's first electrically assisted bicycle was born (Yamaha release, in Japanese; our translation).

The plant then belonged to Yamaha Motor Electronics Co., Ltd., the group company Yamaha's fact books name as the maker of PAS power units from the 2010 edition onward.

That 2015 release also gave the plant's output: about 240,000 drive units in 2013, about 310,000 in 2014, and about 350,000 planned for 2015, for PAS bicycles and for bike makers in Japan and abroad. Yamaha's page for the PW-XM calls the Mori-machi factory "the world's longest running ebike drive unit factory."

The French plant came later. On March 29, 2024, Yamaha announced that Yamaha Motor Manufacturing Europe SAS had begun making the PW-S2, a unit it had supplied from Japan since 2022, to cut lead times for European bike makers.

A third site was announced in October 2021: a joint venture with India's Hero Motors in Ludhiana, Punjab, to build hub-mounted drive units, with Yamaha holding 10%. No production figure for it appears in Yamaha's releases or fact books through 2026.

Yamaha's e-bike timeline, 1973 to 2026

Yamaha's e-bike story runs from petrol-engine bicycle prototypes in 1973 to 48-volt drive units in 2026. Each row below is dated by the record that dates it, with a link to that record, so you can check any line. Where two of Yamaha's own records disagree, both dates are shown.

1988 to 1993: how Yamaha invented the PAS

Yamaha built the PAS to measure how hard you push on the pedals and add motor force in proportion, a control that ran smoothly only after an 8-bit processor gave way to a 16-bit one. Development began in April 1988, the first prototype worked in 1989, and the bicycle went on sale on November 1, 1993 (story 35; 30th-anniversary history).

Yamaha's own history traces the idea back further. It had tried petrol engines on bicycles in 1973 and 1982, its 30th-anniversary history says, before cheaper batteries and computers in the 1980s led it to an electric motor that would "assist" the rider. The company's history story 35 dates the electric approach to April 1988 and names the hard part: "the control mechanism for providing optimal power assistance in line with the pedaling force from the rider."

The law was the second obstacle. Yamaha wanted riders to need no license and no helmet, so the machine had to count as a bicycle, and in August 1990 it began explaining to the Ministry of Transport and the National Police Agency that the motor only assisted the rider. The authorities, story 35 says, accepted "the product's social benefit and public utility." The 30th-anniversary history adds that they approved its classification as a bicycle in 1993.

The launch was cautious and then crowded. Sales began in three prefectures on November 1, 1993, to let dealers learn to service it; advance orders passed the 1,000 units made, so Yamaha raised the run to 3,000, about 10,000 people came to test rides, and production for fiscal 1994 went from 10,000 to 30,000 units (story 35).

The first model, the PAS PA26-A, is in Yamaha's own collection. It weighed 31 kg, used a brushed DC motor rated at 235 W, ran about 20 km on a charge and cost ¥134,000, according to Yamaha's collection page. Yamaha Japan's 25th-anniversary history prints ¥149,000 for the same bike, and its price note counts the battery and charger in.

Its system had a torque sensor at the pedals, a speed sensor, a controller and a battery, and the motor added force "nearly equal" to yours (30th-anniversary history).

If you want the engineering, it is on file at the US Patent and Trademark Office. US patent 5,375,676, assigned to Yamaha and filed from a Japanese application of March 6, 1992, claims motor power "only in proportion to the manual force sensed by said force sensor" (USPTO). Two sister patents by its first-named inventor, Nozomu Takata, cover what happens when something fails and how the assist should fade with speed:

• US 5,370,200 describes malfunction checks and "a start up routine" that "prevents the sudden application of electric power upon starting of the system" (USPTO).
• US 5,474,148 lets "the assist ratio provided by the electric motor" vary "in response to a variety of vehicle conditions such as speed," to save energy and avoid over-speed (USPTO).

Yamaha's earliest electric-assist document in the US patent class is US 5,226,501, granted on July 13, 1993, two weeks before the PAS was announced; it covers how the motor behaves when you push the bike (USPTO). The patent census below counts the rest.

Our history of electric bikes in America picks up the PAS in its 1993 chapter and follows the American side of the story to 2026.

The law that shaped the motor: Japan's assist-ratio rule

Japan's rule for these bicycles sets no wattage limit; it caps how much the motor may add compared with the rider (enforcement ordinance, Art. 1-3). Below 10 km/h the motor may add up to twice your force, the share shrinks as speed rises, and at 24 km/h the assist must stop. A cap tied to your force can only be met by measuring that force.

The rule sits in Article 1-3 of the Road Traffic Act's enforcement ordinance, and the Act counts as a bicycle a pedal vehicle "using a motor to supplement human power" meeting those standards (Road Traffic Act, Art. 2(1)(xi-2); our translation). For speeds from 10 to under 24 km/h, the ordinance writes the cap as a formula: two minus the speed less ten, divided by seven (Art. 1-3(1)(b)(2); our translation).

The arithmetic is ours, from that formula. The cap equals 2 below 10 km/h; it falls to 1.0 at 17 km/h, so the motor matches you one for one; at 20 km/h it is about 0.57; and it reaches zero at 24 km/h. A three- or four-wheeled bicycle towing a trailer gets a higher cap of 3 below 10 km/h under the same article (Art. 1-3(1)(b)(1); our translation).

The cap was lower when the PAS was born. A 1999 Yamaha release gives the old setting in plain numbers: production PAS bikes assisted at "1:1 at speeds from 0 to 15 km/hr (with diminishing ratio from 15 to 24 km/hr)" (1999 release).

Yamaha's fact book records that before December 1, 2008 the maximum was one to one below 15 km/h, and that the revision raised it to "1 to 2 or less at speeds under 10 km/hour"; Yamaha answered with new control technology for its models (fact book 2010, page 51).

Yamaha's release of December 25, 2008 tells it the same way, an assist ratio "at most 1:1" becoming "1:2 or less" below 10 km/h (release, in Japanese; our translation). A second release that day introduced S.P.E.C.3, a control that sets the assist by the gear you have selected, your speed and your pedal force (release, in Japanese).

The ratio rule left a mark on the riding feel. When Yamaha took its units to Europe, its 30th-anniversary history explains, Japan's proportional rule meant your assist dropped sharply between pedal strokes on climbs, a pulse that had been "ridiculed as 'a yo-yo feeling.'" Europe limited only the speed at which assist ends, so riders there preferred steadier push, and Yamaha designed the PW series "from scratch" for that taste (30th-anniversary history).

If you ride in the United States, the rules work differently again. The federal definition of a "low-speed electric bicycle" is about the motor and top speed: "an electric motor of less than 750 watts (1 h.p.)" and a top speed on motor power alone that "is less than 20 mph" for a 170-pound rider (15 U.S.C. § 2085(b)).

The section sets no ratio between motor and rider, and your state's rules decide where you may ride; our law hub covers each state.

1994 to 2011: the PAS grows up in Japan

From 1994 to 2011 Yamaha's motors were PAS units for Japanese everyday bicycles, and almost every generation moved something. The motor went brushless in 1999 (PAS Royal release, in Japanese), into the rear hub in 2001 (PAS Smile release, in Japanese), and back to the center with a magnetostrictive torque sensor in 2003; lithium-ion batteries followed in 2004 (30th-anniversary history).

First exports and partners, 1997 to 1998

The first export deal came four years after launch, and fifteen years before Yamaha's European drive-unit deal with Giant. On September 5, 1997, Yamaha agreed to supply PAS system units, a power unit with battery and charger, to Kynast in Germany, Sparta in the Netherlands, Bianchi in Italy, Trek in the United States and MBK in France, from October, with 15,000 units planned for that fiscal year (release, in Japanese; our translation).

That made eight customers for Yamaha's system units, the same release says, among them Bridgestone Cycle and National Bicycle Industry in Japan, and Yamaha licensed its patents to the makers that fitted them. Trek's own history remembers the result: its 1998 ElecTrek, "Trek's very first electric bike," paired "a Trek frame with Yamaha's PAS motor system" and "only went 20 miles per charge" (Trek).

Brushless, into the rear hub, then back to the center

The PAS Royal, on sale from October 26, 1999, brought a new drive unit: a low-speed, high-torque brushless DC motor with reduction gearing, with no brush noise and quieter gears, and 12% lighter than before at 4.8 kg. Yamaha said the PAS had passed 460,000 units built since its 1994 national launch (release, in Japanese; our translation). The release page is dated September 12, 1999, while Yamaha's news index lists it on October 12.

In February 2001 the motor moved. The PAS Smile's "rear hub power unit" put a small neodymium-magnet motor in the back wheel, assisting the axle "without going through the chain," and separated the control parts and motor that had been "concentrated near the pedals" (release, in Japanese; our translation). Yamaha called it the second-generation PAS. Its early units were the subject of a 2007 free repair, covered in the reliability record.

If your own bike has a hub motor, our hub-drive guide explains how a hub motor works and the two kinds inside it.

Two years later Yamaha went back to the center. Its 30th-anniversary history dates to 2003 a compact center-mounted unit with a brushless motor using rare-earth magnets, adding its force at the chain, with "a non-contact magnetostrictive torque sensor" reading the rider's push (30th-anniversary history). Our motor guide explains how hub and mid-drive motors differ when you ride.

Lithium-ion batteries and smarter assist control

The first lithium-ion battery came in 2004, with 32% more capacity and 25% less weight than the nickel-metal-hydride pack before it, Yamaha's 30th-anniversary history says. If you want the battery side, our battery guide tables Yamaha's PAS batteries model by model, from the lead-acid pack of 1993 to lithium-ion.

Software changed the ride too. In January 2006 Yamaha added an "Auto-Eco Mode" that switched the assist on and off "depending on the load force sensed at the pedals," stretching your range by about 60%; on the PAS Lithium L in power mode, from 53 km to 85 km a charge (2006 release).

After Japan doubled the permitted assist in December 2008, S.P.E.C.3 set the assist by your gear, your speed and your pedal force, as the law section describes.

The million mark arrived in 2008, though Yamaha counts it two ways. Its 30th-anniversary history says drive-unit production reached 1 million that year; its fact book says "cumulative shipments reached one million units at the end of 2008" (fact book 2010, page 51). Production and shipments are different measures, so we print both for you.

2012 to 2019: the PW series takes Yamaha to Europe

Between 2012 and 2019 Yamaha turned its Japanese drive unit into a European product. A deal with Giant in 2012 led to the PW series in 2013, designed from scratch for European riders, then the PW-X for mountain bikes in 2016, a gradient-reading sensor in 2018 (release) and the PW-X2 in 2019. Yamaha-brand bikes reached the US in 2018 (30th-anniversary history).

Giant and a false start with the chain-drive unit

It began with Giant. Yamaha signed a joint-development contract with Giant Electric Vehicle in October 2011, and its August 28, 2012 release scheduled "full-fledged OEM supply of drive units to Europe" for that September, with a goal of 100,000 units of OEM supply to Europe in 2015 (release). Europe had bought about 700,000 e-bikes in 2011, Yamaha estimated, with Germany and the Netherlands over half.

The first try did not fit. Yamaha's 30th-anniversary history recalls that one of the world's largest bicycle makers ordered its Japanese-style "chain resultant force" units in 2012, "but we only ended up supplying a minimum number of units before the order ended" (30th-anniversary history). European makers wanted a crank-drive unit with room for front and rear derailleurs, and riders preferred steadier push, the history explains.

The PW: a crank-drive unit built for Europe

So Yamaha changed the design. The PW series "was developed from scratch as a drive unit with 'crank resultant force' assist control," the history says, adding the motor's force at the crank instead of at the chain.

Yamaha's August 2013 release called it "one of the world's smallest and lightest center-mount drive units," at 3.5 kg without sprocket, with 80 Nm peak and 70 Nm continuous torque and a triple sensor system, supplied to Giant from October 2013 (release).

Before the PW, Yamaha's 2013 e-Bike Systems site already listed a PM Series, "Yamaha's 1st generation power assist systems for E-Bike," driving the crank through a chain (archived page, September 2013). From March 2013 Yamaha also sold complete kits, drive unit, battery, display and charger, to Winora-Staiger and CycleVision (release).

Europe took to it fast. In road tests with that bike maker the PW was praised for "zero cadence," no lag when you press the pedal, and the website drew so many inquiries that Yamaha "had to remove the 'Contact Us' link," the 30th-anniversary history says.

The 100,000-unit goal for 2015 "was achieved brilliantly," its marketing leader of 2013 is quoted as saying. By then Winora's Haibike was one of the brands fitting Yamaha kits (2015 release).

The PW-X, the Quad Sensor System and the PW-X2

The sport units came next. The PW-X of July 2016 was 13% smaller in volume and about 380 g lighter than the PW with similar torque, and added an Extra Power Mode "for riding on rough terrain and up steep gradients" (release). In June 2018 the PWseries TE added an angle sensor to the crank, torque and speed sensors, so an Automatic Support Mode could raise your assist on climbs and drop it to Eco on the flat (release).

Yamaha calls that four-sensor setup the Quad Sensor System, and the TE its "3rd generation drive system" (2018 release). In 2019 the PW-X2 and PWseries ST replaced the PW-X and PWseries SE on Yamaha's site; their product pages were first archived on July 20, 2019 (PW-X2 archived page). That August, Yamaha's brands page named 15 bike makers fitting its units, from Atala and Batavus to Haibike and Winora (archived page).

Yamaha-brand bikes reach the US, and a plan for India

America came last. At Interbike in 2016, Yamaha's 30th-anniversary history admits, visitors knew the name from motorcycles but "nobody knew its history with bicycles or that it birthed the first e-Bike." Four models were announced for 2018, the YDX-TORC eMTB drew the most interest, and the US lineup later grew to 12 models.

In India, a November 2018 plan with Hero Cycles and Mitsui set test sales of Hero bikes with Yamaha units in cities such as Delhi from spring 2019 (release).

2020 to 2026: lighter units, a French plant, Brose, and a US exit

Since 2020 Yamaha has made its units lighter, built them in France (2024 release), bought Brose's e-bike motor business (Brose) and left the US market for complete bikes (dealer letter).

Yamaha's 2026 model-year range adds the 48-volt PW-X4 and PW-S3 while its 36-volt units stay listed (48-volt range; 36-volt range).

Lighter 36-volt units and a French plant

The decade opened with the light units. The PWseries CE of August 2020 was "the lightest drive unit in the Yamaha Motor line-up," 3.0 kg, or 2.9 kg with a coaster brake, with 50 Nm and Automatic Support Mode (release). The PW-X3, marked new in the 2022 catalog, is "approximately 20% smaller and 10% lighter than the PW-X2," Yamaha's product page says, with 85 Nm at 2.75 kg.

The PW-S2 followed in 2022 and the PW-XM, magnesium-cased at 2.6 kg, in the 2024 catalog. On March 29, 2024, Yamaha Motor Manufacturing Europe in France began building the PW-S2, a unit made in Japan since 2022, to cut lead times for European bike makers (release). India got a different plan: a 2021 joint venture with Hero Motors to build hub-mounted units in Ludhiana (release).

The US exit and the Brose purchase

Then Yamaha pulled back from complete bikes abroad. At the end of 2024 Yamaha's US arm, Yamaha Motor Corporation, U.S.A., stopped wholesaling e-bikes (dealer letter), as the section on Yamaha's own bikes explains.

Yamaha's medium-term plan of February 2025 says it plainly on the e-bike page, "Turn focus of complete Yamaha eBike business to Japan," and concentrates development resources on the e-Kit, the drive unit and its parts (medium-term plan 2025-2027, page 16).

The same plan names its SPV business, home of its e-bikes, a strategic one and says to "Explore M&As" (plan, page 10). On March 31, 2025, Yamaha agreed to buy the e-bike drive business of Brose, maker of the Drive C, T and S motors since 2014 (release). Brose completed the transfer on August 1, 2025, and the business now trades as QORE by Yamaha Motor eBike Systems GmbH, covered with its units in the census.

The 48-volt PW-LINK units and the business behind them

The 48-volt units make up Yamaha's 2026 model-year collection. Yamaha's PW-X4 weighs 2.6 kg and gives "100 Nm of peak torque (boost mode)," with about 10 Nm more torque than the 36-volt PW-XM at 70 rpm and above; the PW-S3 weighs 2.85 kg with 85 Nm in boost (PW-X4 page; PW-S3 page).

If you own one, its battery, display and charger belong to Yamaha's 48-volt PW-LINK system.

The business behind them is still losing money. Yamaha's e-bike segment, which also covers electric wheelchairs, earned ¥37.1 billion in 2025 with an operating loss of ¥14.8 billion, narrower than the ¥22.7 billion loss a year earlier (Integrated Report 2026, page 34).

The report's opening message says integrating Brose "is taking longer than anticipated" and that the overseas strategy of "rolling out eBike drive units rather than complete build-up eBikes will remain unchanged" (Integrated Report 2026, page 10).

Yamaha's e-bike business by the numbers

Yamaha sold about 3.02 million complete PAS bicycles in Japan in the 20 fiscal years from 2006 to 2025, by the figures in its own fact books (our fact-book dataset), and had built 5 million drive units by February 2019 (release, in Japanese). Its e-bike revenue peaked at ¥53.3 billion in 2022 and was ¥37.1 billion in 2025. No fact book we read gives the number of drive units it sells to other bike makers.

The unit sales you see here come from bar charts Yamaha prints in its fact books, four years per edition, which we read off the rendered pages of 17 editions and checked against each other wherever two editions print the same year (our dataset).

Sales grew from 67,000 bicycles in 2006 (fact book 2010, page 52) to a peak of 216,000 in 2021 (fact book 2025, page 14), and were 204,000 in 2025 (fact book 2026, page 14). Added together, the 20 years make 3,023,000, our sum.

Yamaha also printed its share of Japan's e-bike market, from its own surveys, until the 2019 edition: 21.9% in 2009, a peak of 36.0% in 2015 and 31.6% in 2018, of a market it put at 602,000 bicycles that year (fact book 2019, page 23).

From the 2020 edition Yamaha switched to the government's count, METI's domestic shipments: 539,529 in 2016 (fact book 2020, page 15), a peak of 795,000 in 2022 and 765,000 in 2025 (fact book 2026, page 14).

Dividing Yamaha's own sales by METI's shipment count gives a rough share for the years Yamaha stopped printing one: 33.4% in 2016, 24.7% in 2023 and 26.7% in 2025. The two figures measure different things (Yamaha's sales against all makers' shipments as METI counts them), so you should treat the ratio as an approximation, our arithmetic (our derived figures).

Revenue tells you a sharper story. Yamaha's e-bike sales grew from ¥9.2 billion in 2006 (fact book 2010, page 52) to ¥53.3 billion in 2022 (fact book 2024, page 15), then fell 30.4% to ¥37.1 billion in 2025 (fact book 2026, page 14).

The fact books label that line "CBU models and OEM" in recent editions (2025 edition, page 14) and "sales from SPV business (PAS and other)" in the editions of 2015 to 2019 (2017 edition, page 23). For 2023 the 2024 edition printed ¥40.8 billion and the 2025 edition ¥42.1 billion; we show both.

The drive-unit milestones you see in the chart come from Yamaha's releases: 250,000 PAS power units by October 1997, 1 million in 2008, 3 million by April 2015 and 5 million by February 2019 (story 35; 3 million release; 5 million release). Its e-Bike Systems site still says "Over 5 million units shipped worldwide" (system page).

Between the last two releases, Yamaha added 2 million units in 3.89 years, about 515,000 a year by our arithmetic (derived figures); the Morimachi plant's own figures were about 310,000 in 2014 and 350,000 planned for 2015 (where the motors are made).

Patents give you a second measure of the engineering. In the US patent class for electric-assist bicycles, CPC B62M 6/40 to 6/90, we counted 4,688 documents on October 4, 2026, of which 175 name Yamaha Motor as assignee or applicant: 90 granted patents and 85 published applications, in 114 families (our patent dataset).

With each company's name variants merged, Yamaha's 175 rank third in the class, after Shimano's 720 and Bosch's 217, and ahead of SRAM's 107.

Every Yamaha drive unit, 1993 to 2026

Our census counts 34 drive units Yamaha has made or owns: 6 PAS generations for Japan, 18 PM and PW units sold to bike makers, and 10 QORE units it took over from Brose in 2025 (our drive-unit dataset). Nineteen are on Yamaha's or QORE's sites today. Three more rows record Giant's co-developed SyncDrive units and the Hero joint venture.

We count one row per name Yamaha or QORE lists, and one per PAS generation Yamaha describes in a dated record, because Yamaha gives its Japanese units no model names. Six of the 34 are speed-pedelec or coaster-brake versions of another unit, or, for 2019's "PWseries 45," a speed-pedelec unit whose base Yamaha's page does not name. Counted without them, the census holds 28 base units.

Each unit's name links to the record it comes from, so you can check any row, and every figure is the maker's own, in the maker's units: kilograms on Yamaha's European pages, pounds on its US page. A dash means the record did not print that figure. Our motor guide sets Yamaha's newest units beside other makers' in its 2026 census of every major drive system.

PAS units for Japan, 1993 to 2014

PM and PW units for bike makers, 2012 to 2026

The same units' power and speed ratings, where Yamaha prints them, show you how the speed-pedelec versions differ: 500 W rated and assist to 45 km/h (PW-S2 for Speed Pedelec), against 250 W and 25 km/h for the rest of the European range.

The dates you see in these tables are the first record of each unit, not always its launch. Where Yamaha's own release dates a unit, we use it; otherwise we use the first catalog that lists it, or the day its product page was first archived. An archive date shows that a page was online by then, not when it went up (our archive-capture dataset).

QORE units, formerly Brose, owned by Yamaha since 2025

If your bike has a 36-volt QORE unit, it is a former Brose Drive C, T, S or TF in an aluminum or magnesium case, by QORE's own datasheets, and some are also sold remanufactured (QORE). The 48-volt Drive 3 Peak and Drive 3 Power are QORE's newest; their datasheets mark the figures as preliminary, and the Peak's EU declaration calls it a "250-watt motor for EPAC."

Co-developed and announced units

Which Yamaha motor do I have?

Check your bike's specification sheet or its maker's product page: Yamaha's current units are the PW-X4 and PW-S3 on the 48-volt system (48-volt range) and the PW-XM, PW-X3, PW-S2, PW-S2 for Speed Pedelec, PW-ST, PW-C2 and coaster-brake PW-CE on the 36-volt one (36-volt range).

If your bike is older, it may have a PW, PW-X, PW-SE, PW-TE or PW-X2, and if you ride a Giant with SyncDrive, its unit is one Giant says it co-developed with Yamaha.

The name alone does not tell you everything, because one unit is sold in versions. Yamaha's European pages rate its units at 250 W with assist to 25 km/h; its US page lists the same units at "250w" rated nominal power, with assist to 20 mph or, on the PWseries ST and the Civante's PW-SE, 28 mph (US technology page).

If your unit is a speed-pedelec version, its name says so: the PW-X2 for Speed Pedelec and the PWseries S2 for Speed Pedelec are rated at 500 W with assist to 45 km/h (PW-S2 for Speed Pedelec page).

One quirk on Yamaha's own site: the PWseries ST and PW-CE for Coaster Brake pages carry the subtitle "Developed for use on speed pedelecs" above specifications that say 25 km/h. Go by the specification line on your unit's page.

If you own one of Yamaha's own US bikes, its serial number is "located on a white barcoded label affixed to the seat tube," 11 characters beginning with X1M, Yamaha's US FAQ says (Yamaha US FAQ). For a partner brand's bike, the bike's own documents name the unit, and Yamaha's FAQ answers other questions with "Please get in contact with the bike dealer or with the bike manufacturer" (Yamaha e-Bike Systems FAQ).

If your display shows an error

If your display shows "ER," Yamaha's US owner's manuals describe that as "a problem in the e-Bike Systems" and give one instruction: turn the power off and on again, and if that does not clear it, have a dealer inspect the bike "as soon as possible" (Civante owner's manual, page 75).

If you ride a YDX-MORO 05 or 07, its manual signals faults with lamps instead: all the assist lamps flashing red means "The problem occurs in the e-Bike Systems" (YDX-MORO 05/07 owner's manual, page 72). It also lists "Error code" among the data the system sends to compatible bike computers (page 78). None of the three US manuals we read lists what the numbered codes mean, so your dealer reads them for you.

Do Yamaha e-bike motors have torque sensors?

Yes, Yamaha's units read your pedal force, and Yamaha's records name a torque sensor in the 1993 PAS, the 2001 rear-hub unit, the 2003 center unit and the PM and PW units of 2013 (30th-anniversary history; 2013 release). The PW series also reads crank rotation and speed, and units with the Quad Sensor System of 2018 read the slope too.

Torque sensing is where Yamaha started. The first PAS had a torque sensor and a speed sensor feeding the controller (30th-anniversary history), and the 2003 center unit added the "non-contact magnetostrictive torque sensor" Yamaha still uses. Its 2026 fact book lists three things the PAS system detects: "the amount of force applied to the pedals," "the speed of the bicycle while in motion" and "the rotation speed of the pedals (crank)" (fact book 2026, page 14).

The law explains why. Japan caps the motor's force as a share of yours, so the system has to measure yours, as the law section shows. Yamaha's 2013 PW page called its version the triple sensor system: torque, speed and crank sensors, so the motor answers how hard and how fast you pedal (archived PW page, 2013).

The fourth sensor came with the PWseries TE in 2018. It "passes the precise road gradient to the power algorithm," and the Automatic Support Mode uses it to step the assist up from a standstill, on a hill or when you accelerate, and down to Eco on the flat or downhill (release).

Yamaha markets an instant start as "Zero Cadence" technology (PW-S3 page): full support "immediately after pressure is applied to the pedal, not after certain crank turn" (PW-X3 page).

If you are deciding between a torque-sensing and a cadence-sensing bike, our motor guide sets out the difference between the two sensors.

Which Yamaha motor is best, and for what?

If you ride steep mountain trails, Yamaha's own top unit is the PW-X4, at 100 Nm in boost and 2.6 kg (specifications); if you want a lighter trail bike, the 2.6 kg, 85 Nm PW-XM (PW-XM page).

If you commute, tour or carry cargo, look at the PW-S3 or PW-S2, and if you ride relaxed in the city, the PW-C2. If you ride a speed pedelec in Europe, you need a unit built for 45 km/h.

Find your ride in the table: it matches each kind of ride to the unit Yamaha's own pages aim at it, with the figures that separate them. "Best" depends on the ride, so we give Yamaha's own positioning, quoted, and the numbers behind it; none of the bikes we could check in our catalog uses a Yamaha unit, so we have no stake in the answer.

Two figures decide most of your choice. Torque sets how hard the motor can push you up a climb, and in Yamaha's range it runs from 55 Nm on the city-bike PW-C2 to 100 Nm on the mountain-bike PW-X4.

Voltage decides the family. Yamaha lists the 48-volt PW-X4 and PW-S3 with their own PW-LINK displays, batteries and charger, apart from the 36-volt system's (48-volt range), so check the voltage before you buy a used bike or a spare battery.

The frames are another matter: Yamaha calls the PW-S3 "fully compatible with PWseries S2 frames," which matters if your bike was built around a PW-S2 (PW-S3 page).

If you are shopping by the ride rather than the motor, our electric mountain bike guide and commuter e-bike guide match bikes we sell to those rides.

Yamaha vs Bosch: what the makers' own numbers say

On paper, if you compare the top units, Bosch's 2026 unit is the stronger one and Yamaha's is the lighter: Bosch prints 120 Nm and 2.8 kg for its Performance Line CX (Bosch), Yamaha 100 Nm and 2.6 kg for the PW-X4 (Yamaha). Yamaha started more than 17 years earlier, in 1993, and holds 175 US patent documents in the class to Bosch's 217 (our patent dataset).

These are the makers' own figures, and the makers state them differently. Bosch prints a "maximum possible drive torque" and footnotes it "Maximum values: Deviations possible," adding that the CX's "performance values of this drive unit may be lower upon delivery" and can be raised in its app (Bosch Performance Line CX page).

Yamaha prints peak torque in boost mode and, for the PW-X4 and PW-S3, a continuous figure as well (PW-X4 specifications). If you compare the two, read a gap of a few newton-meters as a difference on paper.

Bosch's figures are from the comparison table on its European product pages, read on October 4, 2026; Yamaha's from its own specification pages the same day. The full Bosch story, with all 32 of its drive units, is in our Bosch history, and the Bafang story in our Bafang history.

What the numbers leave out is the feel. Yamaha sells "Zero Cadence" technology, full assist without waiting for the crank to turn (PW-S3 page), and calls its drive unit "basically maintenance-free" (e-Bike Systems FAQ). If you are choosing between two bikes, ride both: the same frame can feel different with each motor's tuning.

How fast do Yamaha e-bikes go, and are they legal in the US?

Of the eight models still on Yamaha's US site, the five YDX-MORO mountain bikes assist you up to 20 mph and the CrossCore RC, Civante and Wabash RT up to 28 mph; Yamaha's European units stop at 25 km/h (15.5 mph) (Yamaha US; PW-X4 specifications).

The US bikes have no throttle (Yamaha US FAQ), so they fall in the pedal-assist classes of states that use the three-class system; our buying guide explains which e-bike class to buy. Your state's law decides where you may ride.

Yamaha's own US pages disagree. Its FAQ says its bikes "provide pedal assist up to 20mph" and that "All Yamaha Power Assist Bicycles are pedal assist only and do not have a throttle" (Yamaha US FAQ).

Yamaha's model pages print "28 mph MAX SPEED" for the CrossCore RC and Wabash RT, both with the PWseries ST, and for the Civante with the PW-SE (CrossCore RC; Wabash RT; Civante), and 20 mph for the YDX-MORO models (YDX-MORO 07). If you are comparing bikes, go by each model page.

Federal law defines a "low-speed electric bicycle" by its motor and top speed: "an electric motor of less than 750 watts (1 h.p.)" and a top speed on motor power alone that "is less than 20 mph" (15 U.S.C. § 2085(b)). If you want the federal detail, our 750 W guide covers whether a 750W e-bike is legal in the US.

Where you may ride is state law. California, for example, defines a class 1 bike as one whose motor "ceases to provide assistance when the bicycle reaches the speed of 20 miles per hour," and class 3 at 28 miles per hour, "equipped with a speedometer" (Cal. Veh. Code § 312.5(a)). Our California e-bike laws guide covers the rest of the state's rules, city by city.

Before you derestrict a Yamaha motor

If you are thinking of derestricting a Yamaha motor, two records matter. Yamaha's e-Bike Systems FAQ answers "Can I tune the system?" with "the user must not atempt [sic] to tune the system," to avoid "infringement of regulation and damage to the bike" (FAQ). The same FAQ warns that moving the system to another frame risks making your bike "non-compliant to regulation."

The law is plainer still in California. Since January 1, 2025, its Vehicle Code says a vehicle "modified to attain a speed greater than 20 miles per hour on motor power alone or to have motor power of more than 750 watts" is not an electric bicycle at all, and shall not be sold or labeled as one (§ 312.5(d)(2)).

Tampering is a violation in its own right in California. The code says "A person shall not tamper with or modify an electric bicycle described in subdivision (a) of Section 312.5 so as to change the speed capability of the bicycle," unless the bike still meets the definition and its class label is replaced (§ 24016(d)).

Since January 1, 2026, no one may sell a product, device or application that takes a bike outside that definition (§ 24016(e)). Unless the code says otherwise, breaking either rule is an infraction (§ 40000.1).

If you are convicted, you face a fine of up to $100 for a first infraction and a fine of up to $200 for a second within a year of a conviction (§ 42001(a)). The code's misdemeanor article and its penalty article do not name § 24016 (Division 17, Article 1; Division 18, Article 1). Rules differ by state; our state-by-state law guide covers yours.

Are Yamaha e-bike motors reliable? What the record shows

If you look up the public records, they show three drive-unit repair campaigns, all in Japan: two in 2007 and 2008 for units built between 2001 and 2004, and a 2020 software fix (Yamaha's recall notices, in Japanese). The US Consumer Product Safety Commission lists no Yamaha e-bike, drive unit or battery (our CPSC search), and neither does the EU's Safety Gate for the last ten years (our Safety Gate search).

Start with the US. The Consumer Product Safety Commission's recall database held 10,027 records on October 4, 2026, the newest dated September 24, 2026, and 51 of them name Yamaha: golf cars, off-road vehicles, ATVs, snowmobiles, off-road motorcycles and generators from Yamaha Motor, music and audio products from the instrument maker, and three other companies' products. None pairs Yamaha or a Yamaha unit name with a bicycle (CPSC recalls; our dataset).

Europe's record is similar for the last ten years. The EU's Safety Gate, its alert system for dangerous non-food products, returned 31 Yamaha alerts for that period on October 4, 2026: 26 for motorcycles, one for a motorcycle part, and one each for a scooter, a personal watercraft, a utility vehicle and a children's sweatshirt. Searches for "Yamaha e-bike," "Yamaha bicycle," "PW-X" and "Yamaha drive unit" returned none (Safety Gate).

Japan is where Yamaha's record lives, on its own recall page for PAS bicycles, which lists 15 free-repair notices from 2007 to 2025 (Yamaha PAS notices, in Japanese). Three concern drive units, three concern batteries and nine concern other parts of the bicycle, from handlebar stems and rims to locks, a rear carrier and a child seat.

The 2007 campaign is the serious one. By May 25, 2007, Yamaha had reported "a total of 18 accidents" to the Ministry of Economy, Trade and Industry as serious product accidents, and its own investigation found "the possibilities are high for two of these accidents as being due to a defect in the product" (Yamaha release, May 31, 2007). The units were built between January 2001 and February 2003; the notice's title dates the bicycles 2003 to February 2005.

None of this is a failure rate, and no maker publishes one. Yamaha says its drive unit is "basically maintenance-free" and that "Software or firmware updates are not necessary" (e-Bike Systems FAQ). If you are buying a used Yamaha-powered bike, check whether its battery falls under a notice and what warranty its maker gives you.

Concepts and prototypes, 1973 to 2025

Yamaha's Tokyo show releases describe e-bike concepts and prototypes from 1997: a PAS concept that year, a folding PAS and two sport prototypes in 2001 (2001 release), the two-motor PAS er in 2009, then concepts in 2011, 2013, 2015, 2017 and 2019 and at the 2023 and 2025 Japan Mobility Shows. Earlier came two petrol prototypes, in 1973 and 1982 (30th-anniversary history), and a two-motor racing pacer in 1999 (1999 release).

Some concepts became products. The YPJ-XC shown in 2017 was on Yamaha's 2019 stand as a production bike (2019 release), and the Dual Twin frame of Yamaha's YDX-MORO mountain bikes carries the 2025 Y-00B.

Three show ideas stand out for drive units: the PAS er of 2009, with motors on both wheels and a front one that regenerates; the front-hub motor of 2011, ten years after the rear-hub PAS Smile; and the steering sensor of 2023, borrowed from the PAS torque sensor (2009 release; 2011 release; 2023 release).

Two-motor e-bikes are on sale today; our dual-motor guide explains what a second motor buys you, and our technology guide rates the Y-00B: Base concept.

Did Yamaha stop making e-bikes? Yamaha's own bikes, from PAS to the US exit

No. Yamaha still makes PAS e-bikes for Japan, about 204,000 sold there in 2025 (fact book 2026, page 14), and drive units for other brands. What ended is Yamaha's own complete bikes abroad: Yamaha's US arm, Yamaha Motor Corporation, U.S.A., stopped wholesaling e-bikes at the end of 2024 (dealer letter), and Yamaha's 2025 plan turns its complete-bike business to Japan (medium-term plan, page 16).

The US story ran six years. Yamaha's US arm entered the American e-bike market in 2018, and in a letter to its dealers late in 2024 it explained the exit: oversupply after the pandemic and a softening market made it "extremely difficult to achieve a sustainable business model," so "Yamaha has made the difficult decision to withdraw from the U.S. eBike business and cease wholesaling units effective the end of this year" (YMUS dealer letter).

The same letter set out a promotion of up to 60% off on bikes retailed and warranty-registered by June 30, 2025, and a promise that "YMUS will continue to provide parts, service, and customer support in the United States both now and in support of our limited 5-year warranty." Bicycle Retailer and Industry News reported the decision on November 2, 2024, quoting Yamaha's division manager that the company had just under 400 US e-bike dealers (BRAIN).

If you look at Yamaha's US site, it still lists eight models with their suggested retail prices, from the $2,999 CrossCore RC to the $6,499 YDX-MORO 07 Special Edition, and a 5-year limited warranty on the drive unit, battery, rigid frame and rigid fork for bikes registered on or after December 1, 2023 (Yamaha US; US FAQ).

Yamaha's global e-Bike Systems FAQ still says "Today, Yamaha branded e-bikes are sold in Japan and in the USA" (FAQ). Yamaha Motor Corporation, U.S.A.'s own online shop still sells you e-bike parts, such as a $349.99 rear fender and rack kit, while its e-bike models page lists no bikes you can buy (Yamaha USA shop).

The decision reaches beyond the US. Yamaha's 2026 integrated report attributes its lower e-bike revenue in 2025 to "our withdrawal from the overseas complete build-up (CBU) eBike business," and reports a "6% year-on-year increase in sales of complete build-up (CBU) eBikes in 2025" (Integrated Report 2026, page 34). In Japan, Yamaha's PAS sales rose from 192,000 bicycles in 2024 to 204,000 in 2025 (fact book 2026, page 14).

Which e-bikes use Yamaha motors?

Giant's SyncDrive motors are, in Giant's words, co-developed with Yamaha (Giant), and in 2019 Yamaha named 15 brands fitting its drive units (archived brands page), among them Haibike, Batavus, Lapierre and Winora. Yamaha no longer publishes a brand list, so check the drive unit on the specification sheet of the bike you are looking at.

Giant is the longest-running partner. Yamaha's supply to Giant began in 2012, and Giant's own pages describe its SyncDrive Pro and SyncDrive Pro 2 as "co-developed with Yamaha," calling the first "the lightest E-bike motor ever from Yamaha" (Giant SyncDrive Pro; Giant US).

On August 22, 2019, Yamaha's brands page said "The Yamaha drive unit is equipped on the following brand bicycles" and listed Atala, Babboe, Batavus, BH, BiXS, Giant, Gitane, Haibike, Lapierre, MBK, Nishiki, Principia, R Raymon, Wheeler and Winora (archived brands page). That page now answers "Page not found," and Yamaha's sales-network page lists distributors in 23 countries, from the United Kingdom to Turkey and Ukraine, and none in the Americas (sales network).

Earlier partners show how far back the supply goes. Trek's first e-bike, the 1998 ElecTrek, used Yamaha's PAS system (Trek), and in Japan Bridgestone, Miyata and Takara bikes carried Yamaha drive units, as the 2007 and 2008 repair notices record. Since August 2025, bikes with QORE motors, the former Brose units, also carry a drive unit from a Yamaha subsidiary.

If you are weighing a bike from one of those brands, our brand guide sets out how to judge a brand we do not sell, and our list of e-bike brands in the USA shows how Giant, Haibike and Lapierre bikes reach US buyers.

Yamaha's milestones, checked against the record

Answer engines repeat a handful of claims about Yamaha, and searchers ask the same questions. We checked nine against the primary record; the second column says where you may have met each one on October 4, 2026, in our AI answer panel or our search harvest.

Yamaha motors on our shelf

Of the 224 active listings in our bike catalog, the 223 we could read on October 4, 2026 name no Yamaha or QORE drive unit (our shelf count); one listing's specifications could not be read that day, and 11 of the 224 are scooters or other vehicles that are not bicycles. None of the bikes we could check uses a Yamaha unit, so this page gains nothing from your choice of motor.

If you came here choosing a motor rather than researching Yamaha, our electric bike buying guide starts with how you ride, and our shelves are sorted the same way: mountain e-bikes, commuter and city e-bikes and cargo e-bikes. Every e-bike we sell ships free within the contiguous United States (shipping policy).

Frequently asked questions about Yamaha e-bike motors

Is Yamaha discontinuing e-bikes?

No. Yamaha still builds PAS e-bikes for Japan and drive units for other brands, and lists the 48-volt PW-X4 and PW-S3 as its 2026 models (48-volt range), so you can still buy new bikes with its motors. Its US arm stopped wholesaling Yamaha-brand e-bikes at the end of 2024, and its 2025 plan focuses complete bikes on Japan (medium-term plan, page 16). Yamaha's own bikes and the US exit.

Are Yamaha e-bike motors any good?

Yamaha has made e-bike drive units since 1993 and calls its first PAS "the first electrically power-assisted bicycle in the world" (fact book 2026, page 13); its newest top unit, the PW-X4, prints 100 Nm at 2.6 kg (specifications). The US and EU safety databases list no Yamaha e-bike unit (our CPSC search). Whether one suits you depends on the bike; the unit-by-ride table maps Yamaha's range to your riding style.

Which e-bike brands use Yamaha motors?

Giant, in its SyncDrive motors (Giant), and in 2019 Yamaha listed 15 brands, including Haibike, Batavus, Lapierre and Winora (archived brands page). Yamaha no longer publishes a list, so check the spec sheet of any bike you are considering for a PW unit. Bikes with Yamaha motors.

Where are Yamaha e-bike motors made?

At Yamaha's Morimachi plant in Shizuoka, Japan, where the PAS began, and since March 2024 also at its French plant, which builds the PW-S2 (fact book 2026, page 14; 2024 release). If your unit is a QORE, its declaration comes from Berlin. Yamaha's 2026 integrated report also mentions drive-unit production bases in Taiwan (page 34). Where the motors are made.

Are Yamaha and Yamaha Motor the same company?

No. Yamaha Motor Co., Ltd., which makes the e-bike motors, was founded on July 1, 1955 (fact book 2026, page 2) as a spin-off of Nippon Gakki, now Yamaha Corporation, the instrument maker (2016 fact book, page 10). The two are separate companies that share the brand. Who makes Yamaha motors.

Is Yamaha Japanese or American?

Japanese. Yamaha Motor is headquartered in Iwata, Japan, and listed on the Tokyo Stock Exchange (Integrated Report 2026, page 66). Its US subsidiary, Yamaha Motor Corporation, U.S.A., sold Yamaha-brand e-bikes in the US from 2018 (30th-anniversary history) to 2024 (dealer letter).

How fast do Yamaha e-bikes go?

Yamaha's US mountain bikes assist up to 20 mph, and its CrossCore RC, Civante and Wabash RT up to 28 mph (CrossCore RC; YDX-MORO 07); its European units stop at 25 km/h, or 45 km/h on the speed-pedelec versions. You can pedal faster, but the motor stops helping you. Speed and US law.

How much does a Yamaha e-bike cost?

Yamaha's US site lists eight models from $2,999 for the CrossCore RC to $6,499 for the YDX-MORO 07 Special Edition, its suggested retail prices on October 4, 2026 (Yamaha US). If you buy another brand's bike with a Yamaha unit, that brand sets the price. The US model list.

Which is more reliable, a Bosch or a Yamaha e-bike motor?

No maker publishes failure rates, so the fairest comparison you can make is the public record: the CPSC lists no Yamaha e-bike unit (our CPSC search), the EU's Safety Gate lists none for the last ten years (our Safety Gate search), and Yamaha's Japanese drive-unit campaigns date from 2007, 2008 and 2020 (recall notices). Yamaha vs Bosch compares the makers' own figures.

What are the common problems with the Yamaha PW-X2 motor?

No recall or safety alert names the PW-X2 in the US, EU or Japanese records we searched (our CPSC search). Yamaha's manuals tell you to switch the system off and on when your display shows an error, then see a dealer if it returns (Civante owner's manual, page 75). The reliability record.

Does a Yamaha e-bike motor need regular maintenance?

Yamaha says no: "The drive unit is basically maintenance-free," and it recommends keeping "the whole bike in good condition overall." It also asks you not to aim a pressure washer at the drive unit or battery (e-Bike Systems FAQ). What Yamaha's FAQ says.

What warranty do Yamaha e-bikes have?

If you own a Yamaha-brand bike in the US, it carries a 5-year limited warranty on the drive unit, battery, rigid frame and fork if registered on or after December 1, 2023, and 1 year on other covered parts (Yamaha US FAQ). For other brands' bikes, Yamaha sends you to the bike's maker. Warranty and support.

Can I turn off the speed limiter on a Yamaha e-bike?

Yamaha says you must not tune the system (e-Bike Systems FAQ), and in California a bike modified to exceed 20 mph on motor power alone or 750 watts is no longer an electric bicycle in law (§ 312.5(d)(2)). Check your state's rules before changing anything. Derestricting and the law.

How do I fix a Yamaha e-bike error code?

Yamaha's manuals give one instruction for a system error: turn the power off and on, and if the error returns, have a dealer inspect your bike (Civante owner's manual, page 75). For a speed-sensor error, they say to check the magnet on the wheel spokes (page 76). Identifying your motor.

Why did Yamaha leave the US e-bike market?

Its US arm told dealers that post-pandemic oversupply and a softening market made a sustainable business "extremely difficult," and stopped wholesaling at the end of 2024 while keeping parts, service and warranty support, so if you own one, you are still covered (dealer letter). The US exit.

Can I buy a Yamaha motor kit for my own bike?

No, you cannot add one to your own bike. Yamaha says its system "is pre-installed by the bike manufacturer, and cannot be retrofitted into a traditional bicycle," because the motor's behavior is set for each bike's tires and drivetrain. Yamaha's FAQ.

How we verified this page, in detail

Every date, name and figure about Yamaha on this page was read in a saved copy of its source on October 4, 2026 (two Yamaha history pages on September 30, 2026), and every computed figure is recomputed by a script from the numbers its source prints, so you can check any figure against the datasets below.

• The sources. 138 documents are cited: 16 official records (US patents, the US Code, California's Vehicle Code, Japan's Road Traffic Act and its enforcement ordinance, the CPSC's recall database, the EU's Safety Gate and Japan's Ministry of Economy, Trade and Industry), 121 publications by Yamaha, by the other companies named and by us, and 1 from the trade press, used to corroborate.
• The archive. 109 of the 138 cited documents carry a public archived copy; every source is also saved as a local research deposit, and the references below name the archive copy or the deposit.
• Yamaha's releases. The English news archive from 1990 to 2026 (74 index entries; the 27 e-bike releases among them read in full) and the Japanese archive (284 releases on the PAS and e-bikes) were saved and read; the dates on this page are the dates in each release, and where Yamaha's index and the release disagree, both are printed. Translations from Japanese are ours.
• The fact books. The e-bike pages of 17 editions of Yamaha's fact book, 2010 to 2026, were rendered and their chart labels read by eye, 173 values in all, each checked against every other edition printing the same year (dataset).
• Yamaha's websites, live and archived. 38 pages of Yamaha's e-Bike Systems site were saved on October 4, 2026, with Yamaha's US site and its eight model pages; 159 archived copies of the site from 2013 to 2026 were read, and each unit's dates on the site come from them (dataset). A capture date shows when a page existed; it never dates a launch.
• The catalogs and manuals. Yamaha's e-Bike Systems catalogs for model years 2022 to 2024 and 3 owner's manuals from Yamaha's US site were downloaded and read.
• The drive-unit census. One row per unit as Yamaha or QORE names it, and one per PAS generation Yamaha describes in a dated record: 37 rows, of which 34 are units Yamaha has made or owns. Every figure is the maker's as printed, and each row names its sources (dataset). Every figure the page computes from them is listed with its method (dataset).
• The patent count. All 4,688 US patents and published applications in the patent office's classes for electric-assist cycles, CPC B62M 6/40 to 6/90, were retrieved from its Patent Public Search on October 4, 2026; a document counts as Yamaha's when its owner or applicant name contains Yamaha Hatsudoki or Yamaha Motor, 175 in all (dataset).
• The recall searches. All 10,027 recall records in the CPSC's database were searched in every field for "Yamaha" on word boundaries (dataset); the EU's Safety Gate was searched in a browser through its own search box, 31 Yamaha alerts over its default ten-year window (dataset); and all 15 of Yamaha's Japanese PAS notices were read and sorted by what each covers (dataset).
• The shelf count. The descriptions of all 224 active listings in our bike catalog were read on October 4, 2026; the same reader finds 18 listings naming Bafang, so an empty result would have been caught (dataset).
• The law. Japan's Road Traffic Act and its enforcement ordinance were read in the current text served by the government's e-Gov law database, 15 U.S.C. § 2085 in the 2024 edition of the US Code, and California Vehicle Code §§ 312.5, 24016, 40000.1 and 42001, with the misdemeanor article of Division 17 and the penalty article of Division 18, on the Legislature's site, all on October 4, 2026.
• The questions. The questions this page answers were matched against 12,438 rows harvested from 11 source types on October 4, 2026 (search suggestions from Google, Bing, DuckDuckGo and YouTube, People Also Ask boxes, related searches, search-result titles, Reddit threads, ranking-page headings, AI follow-up questions and the panel's own prompts), and against a 14-prompt panel answered by 6 AI search engines (82 answers).
• The page pinpoints. Every link to a page of a PDF was re-checked against that page of our saved copy (dataset).
• The images. The cover's type was set in Playcut Brush, a design tool from Playcut (playcut.ai), over a photograph composed on Playcut. Its bicycle is Yamaha's Y-00B: Bricolage concept, photographed on Yamaha's stand at the Japan Mobility Show 2025 by RuinDig/Yuki Uchida (Wikimedia Commons) under CC BY 4.0: we cut the bicycle and its display stands out of that photograph, unchanged, and set them in a hall generated around them with Playcut's Nano Banana Pro image model. The patent sheet is Yamaha's own US patent 5,375,676, and the charts are drawn by script from our datasets.

If you find an error, write to support@redtailebikes.com; every correction is dated in the Limitations below.

Our datasets

The data behind this page's counts, each with its method in the file's opening lines:

• Every Yamaha drive unit in our census, 37 rows with sources
• Yamaha's fact-book e-bike figures, 2010 to 2026 editions, with edition and page
• Every figure this page computes, with its method
• Yamaha's US e-bike patents, with the class total and owner ranking
• Each unit's appearances on Yamaha's site, from archived copies
• Yamaha's 15 Japanese PAS notices, with what each covers
• The CPSC recall search for Yamaha
• The EU Safety Gate search for Yamaha
• Our catalog listings and whether each names Yamaha
• The PDF page of every passage cited to a PDF

The source register

Every source is graded by who published it, so you can weigh each one: official records first (T1), then organizations writing about themselves, Yamaha above all, and our own datasets (T2), and the trade press (T4), used only to corroborate.

Limitations

What this page could not establish, and when each limit lapses: each item names the gap, why it remains open, and the event that would close it, so you can judge how far each figure on the page reaches.

1. The AI answers were read from a connection outside the United States, with US settings wherever an engine offers them; Microsoft Copilot could not be read (a sign-in wall) and one Perplexity answer could not be read (a sign-up prompt). Expires when the panel is re-run from a US connection.
2. The EU's Safety Gate was searched over its default window, the last ten years; its archived alerts, older than that, could not be searched, because the archive option refused the query. Expires when the archived alerts are searched by another route.
3. Yamaha's fact books print their e-bike figures as chart labels, read here by eye; they give no count of the drive units Yamaha sells to other bike makers, so the page gives none. Expires when Yamaha publishes e-Kit unit volumes.
4. Archive capture dates show when a page existed, not when a unit launched; the 2019 "PWseries 45" appears in one capture only, and Yamaha's page does not say which unit it was built on. Expires when Yamaha dates its units in a release or catalog.
5. Yamaha's 2026 report names drive-unit production bases in Taiwan without naming them, and its releases give no production figure for the 2021 Hero joint venture. Expires when Yamaha names the plants or reports output.
6. QORE's 48-volt datasheets mark their figures as preliminary, and the 36-volt QORE units date from the Brose era, before Yamaha owned them. Expires when QORE publishes final figures.
7. Yamaha's own pages disagree in places: its US FAQ says 20 mph while three model pages print 28 mph, its global FAQ still says Yamaha-brand e-bikes are sold in the USA, its collection page prices the 1993 PAS at ¥134,000 while its Japanese 25th-anniversary history prints ¥149,000 with battery and charger, and two release dates differ between Yamaha's index and the release. The page prints both sides. Expires when Yamaha corrects the pages.
8. The patent count matches owner and applicant names, so a Yamaha document filed under another name is missed; patents that came to Yamaha with the Brose business are not counted as Yamaha's. Expires when the class is re-counted against assignment records.
9. Yamaha's Japanese notices and releases are translated by us, and the category given to each notice (drive unit, battery or other part) is our reading of it. Expires when Yamaha publishes them in English.
10. One of the 224 catalog listings could not be read on October 4, 2026, so the shelf count covers 223. Expires at the next catalog read.
11. The engines' answers and the store's figures are as served on October 4, 2026, and change without notice. Expires at the next re-check of this page.

Corrections. None as of October 4, 2026.

References

Every source below was read on October 4, 2026, in a saved copy, except the two Yamaha history pages read on September 30, 2026; the last four entries credit the cover's design tool and photograph and support no fact. Each link opens the cited document itself, so you can check any figure, and an archived copy is named wherever the Internet Archive holds one.

1. Yamaha Motor Co., Ltd. (Yamaha history, Our Stories). Our Stories：35 Developing the PAS-Harmony between Usability and Energy Conservation. Story text. Undated. Accessed September 30, 2026. https://global.yamaha-motor.com/stories/history/stories/0035.html. Archived copy: https://web.archive.org/web/20261004212218/https://global.yamaha-motor.com/stories/history/stories/0035.html.
2. Yamaha Motor Co., Ltd. (news release, in Japanese). 電動アシスト自転車用ドライブユニット累計生産500万台達成. Release text. February 27, 2019. Accessed October 4, 2026. https://global.yamaha-motor.com/jp/news/2019/0227/pas.html. Archived copy: https://web.archive.org/web/20261004212245/https://global.yamaha-motor.com/jp/news/2019/0227/pas.html.
3. Brose Fahrzeugteile SE & Co. KG (press release). Brose transfers e-bike drive business to Yamaha Motor. Release text. August 1, 2025. Accessed October 4, 2026. https://www.brose.com/de-en/press/2025/brose-transfers-e-bike-drive-business-to-yamaha-motor.html. Archived copy: https://web.archive.org/web/20261004212313/https://www.brose.com/de-en/press/2025/brose-transfers-e-bike-drive-business-to-yamaha-motor.html.
4. Yamaha Motor Corporation, U.S.A. (letter to dealers, published by Bicycle Retailer and Industry News). eBike dealer business update. Letter text. Undated letter; reported November 2, 2024. Accessed October 4, 2026. https://www.bicycleretailer.com/sites/default/files/downloads/article/ebikedealerbusinessupdate_bicycleretailercom.pdf. Archived copy: https://web.archive.org/web/20250625052654/https://www.bicycleretailer.com/sites/default/files/downloads/article/ebikedealerbusinessupdate_bicycleretailercom.pdf.
5. Yamaha Motor Co., Ltd., e-Bike Systems (global.yamaha-motor.com). PW-X4 SPECIFICATIONS - e-Bike Systems. Specifications table. Undated page. Accessed October 4, 2026. https://global.yamaha-motor.com/business/e-bike-systems/products/pw-x4/spec.html. Archived copy: https://web.archive.org/web/20260513001854/https://global.yamaha-motor.com/business/e-bike-systems/products/pw-x4/spec.html.
6. Yamaha Motor Co., Ltd., e-Bike Systems (global.yamaha-motor.com). PW-S3 SPECIFICATIONS - e-Bike Systems. Specifications table. Undated page. Accessed October 4, 2026. https://global.yamaha-motor.com/business/e-bike-systems/products/pw-s3/spec.html. Archived copy: https://web.archive.org/web/20261004212448/https://global.yamaha-motor.com/business/e-bike-systems/products/pw-s3/spec.html.
7. Yamaha Motor Co., Ltd., Investor Relations. Integrated Report 2026. PDF page 67. PDF created July 3, 2026. Accessed October 4, 2026. https://global.yamaha-motor.com/ir/library/integrated-report/2026/YMC_IR2026_Eng.pdf#page=67. Archived copy: https://web.archive.org/web/20261004212959/https://global.yamaha-motor.com/ir/library/integrated-report/2026/YMC_IR2026_Eng.pdf.
8. Yamaha Motor Co., Ltd., Investor Relations. FACT BOOK 2026. PDF page 4. PDF created July 24, 2026. Accessed October 4, 2026. https://global.yamaha-motor.com/ir/library/factbook/pdf/2026/2026factbook.pdf#page=4. Archived copy: https://web.archive.org/web/20261004212618/https://global.yamaha-motor.com/ir/library/factbook/pdf/2026/2026factbook.pdf.
9. Yamaha Motor Co., Ltd., Investor Relations. FACT BOOK 2016. PDF page 12. PDF created April 10, 2017. Accessed October 4, 2026. https://global.yamaha-motor.com/ir/library/factbook/pdf/2016/2016factbook.pdf#page=12. Archived copy: https://web.archive.org/web/20221001074916/https://global.yamaha-motor.com/ir/library/factbook/pdf/2016/2016factbook.pdf.
10. Yamaha Motor Co., Ltd. (news release). A single-theme design project collaborated on by Yamaha Corporation and Yamaha Motor, &Y (Andy), The &Y01 design - An electrically power-assisted wheelchair that performs music. Release text. September 24, 2015. Accessed October 4, 2026. https://global.yamaha-motor.com/news/2015/0924/andy.html. Archived copy: https://web.archive.org/web/20261004212646/https://global.yamaha-motor.com/news/2015/0924/andy.html.
11. Yamaha Motor Co., Ltd., Investor Relations. FACT BOOK 2026. PDF page 15. PDF created July 24, 2026. Accessed October 4, 2026. https://global.yamaha-motor.com/ir/library/factbook/pdf/2026/2026factbook.pdf#page=15. Archived copy: https://web.archive.org/web/20261004212618/https://global.yamaha-motor.com/ir/library/factbook/pdf/2026/2026factbook.pdf.
12. United States Patent and Trademark Office. US 5,375,676 A, Bicycle with electric motor. Claim 1 and the front page. December 27, 1994. Accessed October 4, 2026. https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/5375676. Archived copy: https://web.archive.org/web/20261004212712/https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/5375676.
13. Yamaha Motor Co., Ltd. (news release). Yamaha Develops New PW Series for European E-Bikes. Release text. August 28, 2013 (dateline); August 27, 2013 in Yamaha's news index. Accessed October 4, 2026. https://global.yamaha-motor.com/news/2013/0827/pas.html. Archived copy: https://web.archive.org/web/20261004212729/https://global.yamaha-motor.com/news/2013/0827/pas.html.
14. Yamaha Motor Co., Ltd. (news release). Yamaha Motor Acquires German Automotive Parts Manufacturer's e-Kit Business Subsidiary - Establishing a new company in key market of Europe to expand business -. Release text. March 31, 2025. Accessed October 4, 2026. https://global.yamaha-motor.com/news/2025/0331/spv.html. Archived copy: https://web.archive.org/web/20261004212756/https://global.yamaha-motor.com/news/2025/0331/spv.html.
15. Yamaha Motor eBike Systems GmbH (QORE). Impressum – QORE by YMESG. Legal notice. As of November 1, 2025 (legal notice). Accessed October 4, 2026. https://www.qore-system.de/de-de/impressum. Archived copy: https://web.archive.org/web/20261004212836/https://www.qore-system.de/de-de/impressum.
16. Brose Fahrzeugteile SE & Co. KG (press release). Brose sells its e-bike drives business to Yamaha. Release text. March 31, 2025. Accessed October 4, 2026. https://www.brose.com/de-en/press/brose-sells-its-ebike-drives-business-to-yamaha.html. Archived copy: https://web.archive.org/web/20261004212905/https://www.brose.com/de-en/press/brose-sells-its-ebike-drives-business-to-yamaha.html.
17. Yamaha Motor Co., Ltd., Investor Relations. FACT BOOK 2026. PDF page 16. PDF created July 24, 2026. Accessed October 4, 2026. https://global.yamaha-motor.com/ir/library/factbook/pdf/2026/2026factbook.pdf#page=16. Archived copy: https://web.archive.org/web/20261004212618/https://global.yamaha-motor.com/ir/library/factbook/pdf/2026/2026factbook.pdf.
18. Yamaha Motor Co., Ltd., Investor Relations. Integrated Report 2026. PDF page 35. PDF created July 3, 2026. Accessed October 4, 2026. https://global.yamaha-motor.com/ir/library/integrated-report/2026/YMC_IR2026_Eng.pdf#page=35. Archived copy: https://web.archive.org/web/20261004212959/https://global.yamaha-motor.com/ir/library/integrated-report/2026/YMC_IR2026_Eng.pdf.
19. Yamaha Motor Co., Ltd. (news release, in Japanese). 電動アシスト自転車用ドライブユニット累計生産300万台達成. Release text. April 10, 2015. Accessed October 4, 2026. https://global.yamaha-motor.com/jp/news/2015/0410/pas.html. Archived copy: https://web.archive.org/web/20261004213105/https://global.yamaha-motor.com/jp/news/2015/0410/pas.html.
20. Yamaha Motor Co., Ltd., Investor Relations. FACT BOOK 2010. PDF page 52. PDF created May 13, 2010. Accessed October 4, 2026. https://global.yamaha-motor.com/ir/library/factbook/pdf/2009/2009factbook.pdf#page=52. Archived copy: https://web.archive.org/web/20261004213242/https://global.yamaha-motor.com/ir/library/factbook/pdf/2009/2009factbook.pdf.
21. Yamaha Motor Co., Ltd., e-Bike Systems (global.yamaha-motor.com). PW-XM - e-Bike Systems. Page text. Undated page. Accessed October 4, 2026. https://global.yamaha-motor.com/business/e-bike-systems/products36/pw-xm/. Archived copy: https://web.archive.org/web/20261004213327/https://global.yamaha-motor.com/business/e-bike-systems/products36/pw-xm/.
22. Yamaha Motor Co., Ltd. (news release). Yamaha Motor Accelerates Growth: Launches European Production Hub for Electrically Power Assisted Bicycle Drive Units - Strategically targeting expansion into pivotal markets poised for future growth -. Release text. March 29, 2024. Accessed October 4, 2026. https://global.yamaha-motor.com/news/2024/0329/du.html. Archived copy: https://web.archive.org/web/20261004213402/https://global.yamaha-motor.com/news/2024/0329/du.html.
23. Yamaha Motor Co., Ltd. (news release). Yamaha Motor and Hero Motors Company Sign Agreement for New e-Bike Hub-mounted drive unit Manufacturing Joint Venture ― Building e-Bike Hub-mounted drive units in India to supply the growing global market ―. Release text. October 29, 2021. Accessed October 4, 2026. https://global.yamaha-motor.com/news/2021/1029/corporate.html. Archived copy: https://web.archive.org/web/20261004213430/https://global.yamaha-motor.com/news/2021/1029/corporate.html.
24. Yamaha Motor Co., Ltd., e-Bike Systems (global.yamaha-motor.com). The 30th anniversary of the Yamaha e-Bike - e-Bike Systems. Page text. Undated page. Accessed October 4, 2026. https://global.yamaha-motor.com/business/e-bike-systems/30th/. Archived copy: https://web.archive.org/web/20261004213525/https://global.yamaha-motor.com/business/e-bike-systems/30th/.
25. Yamaha Motor Co., Ltd. (Communication Plaza collection). 1993 PAS (PA26-A), collection record. Collection record and specifications. Undated. Accessed September 30, 2026. https://global.yamaha-motor.com/showroom/cp/collection/pas_pas_pa26-a/. Archived copy: https://web.archive.org/web/20261004213649/https://global.yamaha-motor.com/showroom/cp/collection/pas_pas_pa26-a/.
26. Yamaha Motor Co., Ltd. (PAS site, yamaha-motor.co.jp, in Japanese), archived by the Internet Archive. 電動アシスト自転車の歴史はヤマハPASから (PAS 25th-anniversary history: the history of electric-assist bicycles starts with the Yamaha PAS). PAS history table, first row and price note 2. Undated page; captured July 20, 2019. Accessed September 29, 2026. https://web.archive.org/web/20190720235430/https://www.yamaha-motor.co.jp/pas/campaign/25th/index.html.
27. Yamaha Motor Co., Ltd. (news release, in Japanese). 電動ハイブリッド自転車｢ヤマハ PAS｣のシステムユニット 海外供給開始について. Release text. September 5, 1997. Accessed October 4, 2026. https://global.yamaha-motor.com/jp/news/1997/0905/pas.html. Archived copy: https://web.archive.org/web/20261004213737/https://global.yamaha-motor.com/jp/news/1997/0905/pas.html.
28. Trek Bicycle Corporation (trekbikes.com). The 50 bikes that built Trek | Celebrating five decades of innovation. 1998 ElecTrek entry. Undated page. Accessed October 4, 2026. https://www.trekbikes.com/us/en_US/50bikes/. Archived copy: https://web.archive.org/web/20261004213825/https://www.trekbikes.com/us/en_US/50bikes/.
29. Yamaha Motor Co., Ltd. (news release, in Japanese). 新ドライブユニット採用、インテリジェントバッテリー搭載、デザイン一新 さらなる進化を遂げたヤマハ『パスロイヤル』シリーズ新発売. Release text. October 12, 1999 in Yamaha's news index; September 12, 1999 on the release page. Accessed October 4, 2026. https://global.yamaha-motor.com/jp/news/1999/1012/pas.html. Archived copy: https://web.archive.org/web/20261004213858/https://global.yamaha-motor.com/jp/news/1999/1012/pas.html.
30. Yamaha Motor Co., Ltd. (news release, in Japanese). 小型軽量"リアハブパワーユニット"採用で滑らかな走行性と軽量スリム化を両立 ヤマハ電動ハイブリッド自転車『パススマイル』 新発売. Release text. January 15, 2001. Accessed October 4, 2026. https://global.yamaha-motor.com/jp/news/2001/0115/pas.html. Archived copy: https://web.archive.org/web/20261004213926/https://global.yamaha-motor.com/jp/news/2001/0115/pas.html.
31. Yamaha Motor Co., Ltd. (recall information, Japan; in Japanese). 【無償修理】 2003年～2005年2月に製造された後輪モーター型ドライブユニット搭載電動アシスト自転車の無償修理について. Notice text. May 15, 2007. Accessed October 4, 2026. https://www.yamaha-motor.co.jp/recall/pas/2007-05-15/. Archived copy: https://web.archive.org/web/20261004213952/https://www.yamaha-motor.co.jp/recall/pas/2007-05-15/.
32. Yamaha Motor Co., Ltd. (recall information, Japan; in Japanese). 【無償修理】 2003年4月～2004年8月に製造された電動アシスト自転車のドライブユニット無償修理について. Notice text. July 7, 2008. Accessed October 4, 2026. https://www.yamaha-motor.co.jp/recall/pas/2008-07-07/. Archived copy: https://web.archive.org/web/20261004214037/https://www.yamaha-motor.co.jp/recall/pas/2008-07-07/.
33. Yamaha Motor Co., Ltd. (news release). Joint development of electrically power assisted bicycles with Giant Bicycles. Release text. August 28, 2012. Accessed October 4, 2026. https://global.yamaha-motor.com/news/2012/0828/pas-giant.html. Archived copy: https://web.archive.org/web/20261004214105/https://global.yamaha-motor.com/news/2012/0828/pas-giant.html.
34. Yamaha Motor Co., Ltd., Investor Relations. FACT BOOK 2013. PDF page 13. PDF created April 15, 2013. Accessed October 4, 2026. https://global.yamaha-motor.com/ir/library/factbook/pdf/2012/2012factbook.pdf#page=13. Archived copy: https://web.archive.org/web/20221001092059/https://global.yamaha-motor.com/ir/library/factbook/pdf/2012/2012factbook.pdf.
35. Yamaha Motor Co., Ltd. (news release). Increasing supply of electrically power assisted bicycles system kits to Europe. Release text. March 14, 2013. Accessed October 4, 2026. https://global.yamaha-motor.com/news/2013/0314/pas-kit.html. Archived copy: https://web.archive.org/web/20261004214142/https://global.yamaha-motor.com/news/2013/0314/pas-kit.html.
36. Yamaha Motor Co., Ltd. (news release). The 43rd Tokyo Motor Show 2013 - Yamaha Motor Main Display Models. Release text. November 8, 2013. Accessed October 4, 2026. https://global.yamaha-motor.com/news/2013/1108/tms.html. Archived copy: https://web.archive.org/web/20261004214210/https://global.yamaha-motor.com/news/2013/1108/tms.html.
37. Yamaha Motor Co., Ltd. (news release, in Japanese). 電動アシスト自転車の新スポーツブランド「YPJ」第一弾 ロードバイク「YPJ-R」を新発売 爽快な走行性能を実現した新コンセプトの軽量電動アシストスポーツ自転車. Release text. September 28, 2015. Accessed October 4, 2026. https://global.yamaha-motor.com/jp/news/2015/0928/ypj.html. Archived copy: https://web.archive.org/web/20261004214237/https://global.yamaha-motor.com/jp/news/2015/0928/ypj.html.
38. Yamaha Motor Co., Ltd. (news release). Yamaha Motor Begins Supply of "PW-X" System Kit for Electrically Power Assisted Bicycles — Newly Developed High End Sporty Model for Europe —. Release text. July 18, 2016. Accessed October 4, 2026. https://global.yamaha-motor.com/news/2016/0718/e-kit.html. Archived copy: https://web.archive.org/web/20261004214305/https://global.yamaha-motor.com/news/2016/0718/e-kit.html.
39. Yamaha Motor Co., Ltd. (news release). Yamaha Motor Begins Supply of "PWseries TE" System with 2 types of new displays for Electrically Power Assisted Bicycles. Release text. June 6, 2018. Accessed October 4, 2026. https://global.yamaha-motor.com/news/2018/0606/e-kit.html. Archived copy: https://web.archive.org/web/20261004214338/https://global.yamaha-motor.com/news/2018/0606/e-kit.html.
40. Yamaha Motor Co., Ltd., e-Bike Systems (news release). Yamaha Motor answers to the public needs by introducing the PWseries CE drive unit and the External Crossover 500 battery as all new products to the Model Year 2021 line-up - e-Bike Systems. Release text and specifications. August 3, 2020. Accessed October 4, 2026. https://global.yamaha-motor.com/business/e-bike-systems/news/news20200803/. Archived copy: https://web.archive.org/web/20261004214425/https://global.yamaha-motor.com/business/e-bike-systems/news/news20200803/.
41. Yamaha Motor Co., Ltd., e-Bike Systems. e-Bike Systems catalog, model year 2022. Drive-unit pages. PDF created August 31, 2021. Accessed October 4, 2026. https://global.yamaha-motor.com/business/e-bike-systems/news/catalog/YAMAHA_2022_eBike_systems_EN.pdf. Archived copy: https://web.archive.org/web/20250723122456/https://global.yamaha-motor.com/business/e-bike-systems/news/catalog/YAMAHA_2022_eBike_systems_EN.pdf.
42. Yamaha Motor Co., Ltd., e-Bike Systems. e-Bike Systems catalog, model year 2024. Drive-unit pages. PDF created June 15, 2023. Accessed October 4, 2026. https://global.yamaha-motor.com/business/e-bike-systems/news/catalog/YAMAHA_2024_eBike_systems_EN.pdf. No public archived copy; saved as a local research deposit.
43. Yamaha Motor eBike Systems GmbH (QORE). EU declaration of incorporation, QORE Drive 3 Peak (machine code G8H237). Datasheet table. PDF created December 9, 2025. Accessed October 4, 2026. https://production.oebc.media/qore-website/7832e41d0b2ce491b015197c5a0d0b80454b8303/downloads/konformitaetserklaerung/48v/DoI_machinery_Drive3_Peak_G8H237_signed.pdf. Archived copy: https://web.archive.org/web/20261004214713/https://production.oebc.media/qore-website/7832e41d0b2ce491b015197c5a0d0b80454b8303/downloads/konformitaetserklaerung/48v/DoI_machinery_Drive3_Peak_G8H237_signed.pdf.
44. Yamaha Motor Co., Ltd., e-Bike Systems (global.yamaha-motor.com), archived by the Internet Archive. PW-X4 - e-Bike Systems. Page text. Undated page; captured February 8, 2026. Accessed October 4, 2026. https://web.archive.org/web/20260208230937/https://global.yamaha-motor.com/business/e-bike-systems/products/pw-x4/.
45. United States Patent and Trademark Office. US 5,370,200 A, Bicycle with electric motor. Abstract and claims. December 6, 1994. Accessed October 4, 2026. https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/5370200. Archived copy: https://web.archive.org/web/20261004214728/https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/5370200.
46. United States Patent and Trademark Office. US 5,474,148 A, Bicycle with electric motor. Abstract and claims. December 12, 1995. Accessed October 4, 2026. https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/5474148. Archived copy: https://web.archive.org/web/20261004214756/https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/5474148.
47. United States Patent and Trademark Office. US 5,226,501 A, Electric-motored bicycle. Abstract and claims. July 13, 1993. Accessed October 4, 2026. https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/5226501. Archived copy: https://web.archive.org/web/20261004214811/https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/5226501.
48. Digital Agency, Government of Japan (e-Gov Law Search). Enforcement Ordinance of the Road Traffic Act (Prime Minister's Office Order No. 60 of 1960), current text. Art. 1-3. Current text as served October 4, 2026 (e-Gov API v1). Accessed October 4, 2026. https://laws.e-gov.go.jp/law/335M50000002060. Archived copy: https://web.archive.org/web/20261004214857/https://laws.e-gov.go.jp/law/335M50000002060.
49. Digital Agency, Government of Japan (e-Gov Law Search). Road Traffic Act (Act No. 105 of 1960), current text. Art. 2(1)(xi-2). Current text as served October 4, 2026 (e-Gov API v1). Accessed October 4, 2026. https://laws.e-gov.go.jp/law/335AC0000000105. Archived copy: https://web.archive.org/web/20261004214925/https://laws.e-gov.go.jp/law/335AC0000000105.
50. Yamaha Motor Co., Ltd. (news release). PAS Unit-mounted Bicycle "Keirin PAS" Developed as Electro-hybrid Pacer Cycle for Bicycle Races. Release text. May 19, 1999. Accessed October 4, 2026. https://global.yamaha-motor.com/news/1999/0519/pas.html. Archived copy: https://web.archive.org/web/20261004214952/https://global.yamaha-motor.com/news/1999/0519/pas.html.
51. Yamaha Motor Co., Ltd. (news release, in Japanese). 新基準対応電動ハイブリッド自転車PASシリーズ 多様化するニーズに対応したモデル展開. Release text. December 25, 2008. Accessed October 4, 2026. https://global.yamaha-motor.com/jp/news/2008/1225/about-pas.html. No public archived copy; saved as a local research deposit.
52. Yamaha Motor Co., Ltd. (news release, in Japanese). 独自の制御技術による新機構「S.P.E.C.3」と新走行モードを採用 新基準対応の電動ハイブリッド自転車PASシリーズ3モデル新発売. Release text. December 25, 2008. Accessed October 4, 2026. https://global.yamaha-motor.com/jp/news/2008/1225/pas.html. Archived copy: https://web.archive.org/web/20261004215053/https://global.yamaha-motor.com/jp/news/2008/1225/pas.html.
53. U.S. Government Publishing Office (govinfo), United States Code, 2024 edition. 15 U.S.C. § 2085, Low-speed electric bicycles. § 2085(b). 2024 edition of the U.S. Code. Accessed October 4, 2026. https://www.govinfo.gov/content/pkg/USCODE-2024-title15/pdf/USCODE-2024-title15-chap47-sec2085.pdf. Archived copy: https://web.archive.org/web/20251013233319/https://www.govinfo.gov/content/pkg/USCODE-2024-title15/pdf/USCODE-2024-title15-chap47-sec2085.pdf.
54. Yamaha Motor Co., Ltd. (news release). Release of the Electro-hybrid Bicycle "PAS Lithium" Series 2006 Models Achieving "Powerful & Long-running" performance with 60% longer running distance at the same high power assist with "Auto-Eco Mode". Release text. January 17, 2006. Accessed October 4, 2026. https://global.yamaha-motor.com/news/2006/0117/pas_lithium.html. No public archived copy; saved as a local research deposit.
55. Yamaha Motor Co., Ltd., e-Bike Systems (global.yamaha-motor.com), archived by the Internet Archive. PM Series - e-Bike,Pedelec. Page text. Undated page; captured September 28, 2013. Accessed October 4, 2026. https://web.archive.org/web/20130928220850/http://global.yamaha-motor.com:80/business/e-bike-systems/pm/.
56. Yamaha Motor Co., Ltd. (news release). Yamaha MotoGP Teams Ride Haibike’s E-bikes Equipped with Yamaha E-KITs. Release text. May 7, 2015. Accessed October 4, 2026. https://global.yamaha-motor.com/news/2015/0507/e-kits.html. Archived copy: https://web.archive.org/web/20261004215227/https://global.yamaha-motor.com/news/2015/0507/e-kits.html.
57. Yamaha Motor Co., Ltd., e-Bike Systems (global.yamaha-motor.com), archived by the Internet Archive. PW-X2 - e-Bike Systems | Yamaha Motor Co., Ltd.. Page text. Undated page; captured July 20, 2019. Accessed October 4, 2026. https://web.archive.org/web/20190720123827/https://global.yamaha-motor.com/business/e-bike-systems/products/pw-x2/.
58. Yamaha Motor Co., Ltd., e-Bike Systems (global.yamaha-motor.com), archived by the Internet Archive. BRANDS / PARTNERS - e-Bike Systems | Yamaha Motor Co., Ltd.. Page text. Undated page; captured August 22, 2019. Accessed October 4, 2026. https://web.archive.org/web/20190822113734/https://global.yamaha-motor.com/business/e-bike-systems/brands/.
59. Yamaha Motor Co., Ltd. (news release). Yamaha Motor Studies Feasibility of Electrically Power Assisted Bicycles in India — Concludes MOU with Hero Cycles and Mitsui & Co. —. Release text. November 21, 2018. Accessed October 4, 2026. https://global.yamaha-motor.com/news/2018/1121/e-kit.html. Archived copy: https://web.archive.org/web/20261004215254/https://global.yamaha-motor.com/news/2018/1121/e-kit.html.
60. Yamaha Motor Co., Ltd., e-Bike Systems (global.yamaha-motor.com). PRODUCTS - 48V:PW-LINK System - e-Bike Systems. Page text. Undated page. Accessed October 4, 2026. https://global.yamaha-motor.com/business/e-bike-systems/products/. Archived copy: https://web.archive.org/web/20260515173835/https://global.yamaha-motor.com/business/e-bike-systems/products/.
61. Yamaha Motor Co., Ltd., e-Bike Systems (global.yamaha-motor.com). PRODUCTS - 36V:PW system - e-Bike Systems. Page text. Undated page. Accessed October 4, 2026. https://global.yamaha-motor.com/business/e-bike-systems/products36/. Archived copy: https://web.archive.org/web/20260821200554/https://global.yamaha-motor.com/business/e-bike-systems/products36/.
62. Yamaha Motor Co., Ltd., e-Bike Systems (global.yamaha-motor.com). PW-X3 - e-Bike Systems. Page text. Undated page. Accessed October 4, 2026. https://global.yamaha-motor.com/business/e-bike-systems/products36/pw-x3/. Archived copy: https://web.archive.org/web/20261004215321/https://global.yamaha-motor.com/business/e-bike-systems/products36/pw-x3/.
63. Yamaha Motor Co., Ltd.. Medium-Term Management Plan (2025-2027), presentation. Slide 16. PDF created February 11, 2025. Accessed October 4, 2026. https://global.yamaha-motor.com/about/mtp/pdf/2025/2025medium-plan-e.pdf#page=16. Archived copy: https://web.archive.org/web/20261004215553/https://global.yamaha-motor.com/about/mtp/pdf/2025/2025medium-plan-e.pdf.
64. Yamaha Motor Co., Ltd.. Medium-Term Management Plan (2025-2027), presentation. Slide 10. PDF created February 11, 2025. Accessed October 4, 2026. https://global.yamaha-motor.com/about/mtp/pdf/2025/2025medium-plan-e.pdf#page=10. Archived copy: https://web.archive.org/web/20261004215553/https://global.yamaha-motor.com/about/mtp/pdf/2025/2025medium-plan-e.pdf.
65. Yamaha Motor Co., Ltd., e-Bike Systems (global.yamaha-motor.com). PW-X4 - e-Bike Systems. Page text. Undated page. Accessed October 4, 2026. https://global.yamaha-motor.com/business/e-bike-systems/products/pw-x4/. Archived copy: https://web.archive.org/web/20260821200518/https://global.yamaha-motor.com/business/e-bike-systems/products/pw-x4/.
66. Yamaha Motor Co., Ltd., e-Bike Systems (global.yamaha-motor.com). PW-S3 - e-Bike Systems. Page text. Undated page. Accessed October 4, 2026. https://global.yamaha-motor.com/business/e-bike-systems/products/pw-s3/. Archived copy: https://web.archive.org/web/20261004215708/https://global.yamaha-motor.com/business/e-bike-systems/products/pw-s3/.
67. Yamaha Motor Co., Ltd., Investor Relations. Integrated Report 2026. PDF page 11. PDF created July 3, 2026. Accessed October 4, 2026. https://global.yamaha-motor.com/ir/library/integrated-report/2026/YMC_IR2026_Eng.pdf#page=11. Archived copy: https://web.archive.org/web/20261004212959/https://global.yamaha-motor.com/ir/library/integrated-report/2026/YMC_IR2026_Eng.pdf.
68. Redtail eBikes (first-party dataset). Yamaha Motor's e-bike figures in its fact books, 2010-2026 editions: unit sales, market, shipments and revenue, with edition and page (CSV). One row per record. October 4, 2026. Accessed October 4, 2026. https://cdn.shopify.com/s/files/1/1032/8847/1835/files/yamaha-ebike-motors_factbook_20261004.csv?v=1791149930. No public archived copy; saved as a local research deposit.
69. Yamaha Motor Co., Ltd., Investor Relations. FACT BOOK 2010. PDF page 53. PDF created May 13, 2010. Accessed October 4, 2026. https://global.yamaha-motor.com/ir/library/factbook/pdf/2009/2009factbook.pdf#page=53. Archived copy: https://web.archive.org/web/20261004213242/https://global.yamaha-motor.com/ir/library/factbook/pdf/2009/2009factbook.pdf.
70. Yamaha Motor Co., Ltd., Investor Relations. FACT BOOK 2025. PDF page 16. PDF created July 1, 2025. Accessed October 4, 2026. https://global.yamaha-motor.com/ir/library/factbook/pdf/2025/2025factbook.pdf#page=16. Archived copy: https://web.archive.org/web/20250903065739/https://global.yamaha-motor.com/ir/library/factbook/pdf/2025/2025factbook.pdf.
71. Yamaha Motor Co., Ltd., Investor Relations. FACT BOOK 2019. PDF page 25. PDF created April 4, 2019. Accessed October 4, 2026. https://global.yamaha-motor.com/ir/library/factbook/pdf/2019/2019factbook.pdf#page=25. Archived copy: https://web.archive.org/web/20221001074749/https://global.yamaha-motor.com/ir/library/factbook/pdf/2019/2019factbook.pdf.
72. Yamaha Motor Co., Ltd., Investor Relations. FACT BOOK 2020. PDF page 17. PDF created April 1, 2020. Accessed October 4, 2026. https://global.yamaha-motor.com/ir/library/factbook/pdf/2020/2020factbook.pdf#page=17. Archived copy: https://web.archive.org/web/20221001091026/https://global.yamaha-motor.com/ir/library/factbook/pdf/2020/2020factbook.pdf.
73. Redtail eBikes (first-party dataset). Every figure this page computes from Yamaha's numbers, with the method (CSV). One row per record. October 4, 2026. Accessed October 4, 2026. https://cdn.shopify.com/s/files/1/1032/8847/1835/files/yamaha-ebike-motors_derived_20261004.csv?v=1791149933. No public archived copy; saved as a local research deposit.
74. Yamaha Motor Co., Ltd., Investor Relations. FACT BOOK 2024. PDF page 17. PDF created April 1, 2024. Accessed October 4, 2026. https://global.yamaha-motor.com/ir/library/factbook/pdf/2024/2024factbook.pdf#page=17. Archived copy: https://web.archive.org/web/20240519205746/https://global.yamaha-motor.com/ir/library/factbook/pdf/2024/2024factbook.pdf.
75. Yamaha Motor Co., Ltd., Investor Relations. FACT BOOK 2017. PDF page 25. PDF created April 10, 2017. Accessed October 4, 2026. https://global.yamaha-motor.com/ir/library/factbook/pdf/2017/2017factbook.pdf#page=25. Archived copy: https://web.archive.org/web/20221001083142/https://global.yamaha-motor.com/ir/library/factbook/pdf/2017/2017factbook.pdf.
76. Yamaha Motor Co., Ltd., e-Bike Systems (global.yamaha-motor.com). SYSTEM - e-Bike Systems. Page text. Undated page. Accessed October 4, 2026. https://global.yamaha-motor.com/business/e-bike-systems/system/. Archived copy: https://web.archive.org/web/20260821200531/https://global.yamaha-motor.com/business/e-bike-systems/system/.
77. Redtail eBikes (first-party dataset). US patents and published applications naming Yamaha Motor in CPC B62M 6/40-6/90, with the class total and the owner ranking (CSV). One row per record. October 4, 2026. Accessed October 4, 2026. https://cdn.shopify.com/s/files/1/1032/8847/1835/files/yamaha-ebike-motors_patents_20261004.csv?v=1791149936. No public archived copy; saved as a local research deposit.
78. Redtail eBikes (first-party dataset). Every Yamaha e-bike drive unit in our census, 1993-2026: the maker's figures as printed, with the source of every row (CSV). One row per record. October 4, 2026. Accessed October 4, 2026. https://cdn.shopify.com/s/files/1/1032/8847/1835/files/yamaha-ebike-motors_drive-units_20261004_7de25b33-1d18-4a7f-9f35-bcffaa648ae5.csv?v=1791152903. No public archived copy; saved as a local research deposit.
79. Yamaha Motor Co., Ltd. (news release, in Japanese). “GREEN CORE”思想に基づいた次世代ドライブユニットを新開発. Release text. November 13, 2014. Accessed October 4, 2026. https://global.yamaha-motor.com/jp/news/2014/1113/pas.html. Archived copy: https://web.archive.org/web/20261004220227/https://global.yamaha-motor.com/jp/news/2014/1113/pas.html.
80. Yamaha Motor Corporation, U.S.A. (yamahabicycles.com). Technology: drive units. Drive-unit specifications. Undated page. Accessed October 4, 2026. https://www.yamahabicycles.com/ebike.php?action=technology-drive. Archived copy: https://web.archive.org/web/20260821200619/https://www.yamahabicycles.com/ebike.php?action=technology-drive.
81. Yamaha Motor Co., Ltd., e-Bike Systems (global.yamaha-motor.com), archived by the Internet Archive. PRODUCTS - e-bike, pedelec | Yamaha Motor Co., Ltd.. Page text. Undated page; captured April 3, 2019. Accessed October 4, 2026. https://web.archive.org/web/20190403050449/https://global.yamaha-motor.com/business/e-bike-systems/products/.
82. Yamaha Motor Co., Ltd., e-Bike Systems (global.yamaha-motor.com). PWseries ST - e-Bike Systems. Page text. Undated page. Accessed October 4, 2026. https://global.yamaha-motor.com/business/e-bike-systems/products36/pw-st/. Archived copy: https://web.archive.org/web/20260508121426/https://global.yamaha-motor.com/business/e-bike-systems/products36/pw-st/.
83. Yamaha Motor Co., Ltd., e-Bike Systems (global.yamaha-motor.com). PWseries CE for Coaster Brake - e-Bike Systems. Page text. Undated page. Accessed October 4, 2026. https://global.yamaha-motor.com/business/e-bike-systems/products36/pw-ce-cb/. Archived copy: https://web.archive.org/web/20260509134903/https://global.yamaha-motor.com/business/e-bike-systems/products36/pw-ce-cb/.
84. Yamaha Motor Co., Ltd., e-Bike Systems (global.yamaha-motor.com). PW-X3 - e-Bike Systems. Specifications table. Undated page. Accessed October 4, 2026. https://global.yamaha-motor.com/business/e-bike-systems/products36/pw-x3/spec.html. Archived copy: https://web.archive.org/web/20260208234836/https://global.yamaha-motor.com/business/e-bike-systems/products36/pw-x3/spec.html.
85. Yamaha Motor Co., Ltd., e-Bike Systems (global.yamaha-motor.com). PWseries S2 - e-Bike Systems. Specifications table. Undated page. Accessed October 4, 2026. https://global.yamaha-motor.com/business/e-bike-systems/products36/pw-s2/spec.html. Archived copy: https://web.archive.org/web/20260606051514/https://global.yamaha-motor.com/business/e-bike-systems/products36/pw-s2/spec.html.
86. Yamaha Motor Co., Ltd., e-Bike Systems (global.yamaha-motor.com). PW-XM - e-Bike Systems. Specifications table. Undated page. Accessed October 4, 2026. https://global.yamaha-motor.com/business/e-bike-systems/products36/pw-xm/spec.html. Archived copy: https://web.archive.org/web/20260607165132/https://global.yamaha-motor.com/business/e-bike-systems/products36/pw-xm/spec.html.
87. Yamaha Motor Co., Ltd., e-Bike Systems (global.yamaha-motor.com). PWseries S2 for Speed Pedelec - e-Bike Systems. Page text. Undated page. Accessed October 4, 2026. https://global.yamaha-motor.com/business/e-bike-systems/products36/pw-s2-sp/. Archived copy: https://web.archive.org/web/20260606041227/https://global.yamaha-motor.com/business/e-bike-systems/products36/pw-s2-sp/.
88. Yamaha Motor Co., Ltd., e-Bike Systems (global.yamaha-motor.com). PWseries C2 - e-Bike Systems. Specifications table. Undated page. Accessed October 4, 2026. https://global.yamaha-motor.com/business/e-bike-systems/products36/pw-c2/spec.html. Archived copy: https://web.archive.org/web/20260614230159/https://global.yamaha-motor.com/business/e-bike-systems/products36/pw-c2/spec.html.
89. Redtail eBikes (first-party dataset). When each Yamaha drive unit appeared on Yamaha's e-Bike Systems site, from archived captures, 2013-2026 (CSV). One row per record. October 4, 2026. Accessed October 4, 2026. https://cdn.shopify.com/s/files/1/1032/8847/1835/files/yamaha-ebike-motors_site-captures_20261004_6c3fa864-4e1b-4910-a6ff-16b3625cf713.csv?v=1791153730. No public archived copy; saved as a local research deposit.
90. Yamaha Motor eBike Systems GmbH (QORE). Datenblatt Drive 3 Peak (datasheet). Datasheet table. PDF created August 6, 2026. Accessed October 4, 2026. https://production.oebc.media/qore-website/7832e41d0b2ce491b015197c5a0d0b80454b8303/downloads/systemparts/48v/Antrieb/Drive3_Peak_Datenblatt.pdf. No public archived copy; saved as a local research deposit.
91. Yamaha Motor eBike Systems GmbH (QORE). Datenblatt Drive 3 Power (datasheet). Datasheet table. PDF created August 6, 2026. Accessed October 4, 2026. https://production.oebc.media/qore-website/7832e41d0b2ce491b015197c5a0d0b80454b8303/downloads/systemparts/48v/Antrieb/Drive3_Power_Datenblatt.pdf. No public archived copy; saved as a local research deposit.
92. Yamaha Motor eBike Systems GmbH (QORE). Datenblatt 36V drive units, Gen 1 and Gen 2 (datasheet). Datasheet table. PDF created December 3, 2025. Accessed October 4, 2026. https://production.oebc.media/qore-website/7832e41d0b2ce491b015197c5a0d0b80454b8303/downloads/systemparts/36v/Antrieb/Datenblatt_Gen1_Gen2.pdf. No public archived copy; saved as a local research deposit.
93. Giant Manufacturing Co., Ltd. (giant-bicycles.com). SyncDrive Pro | Giant Bicycles Official site. Product text. Undated page. Accessed October 4, 2026. https://www.giant-bicycles.com/global/showcase/syncdrive-pro. Archived copy: https://web.archive.org/web/20260219100922/https://www.giant-bicycles.com/global/showcase/syncdrive-pro.
94. Giant Manufacturing Co., Ltd. (giant-bicycles.com). SyncDrive Pro Electric Bike Motor | Giant Bicycles US. Product text. Undated page. Accessed October 4, 2026. https://www.giant-bicycles.com/us/e-tech-syncdrive-pro. Archived copy: https://web.archive.org/web/20260612203824/https://www.giant-bicycles.com/us/e-tech-syncdrive-pro.
95. Yamaha Motor Corporation, U.S.A. (yamahabicycles.com). Frequently asked questions. FAQ answers. Undated page. Accessed October 4, 2026. https://www.yamahabicycles.com/ebike.php?action=faq. No public archived copy; saved as a local research deposit.
96. Yamaha Motor Co., Ltd., e-Bike Systems (global.yamaha-motor.com). FAQ - e-Bike Systems. FAQ answers. Undated page. Accessed October 4, 2026. https://global.yamaha-motor.com/business/e-bike-systems/faq/. Archived copy: https://web.archive.org/web/20260821200554/https://global.yamaha-motor.com/business/e-bike-systems/faq/.
97. Yamaha Motor Corporation, U.S.A. (yamahabicycles.com). Owner's manual: CIVANTE. PDF page 81. PDF created April 13, 2020. Accessed October 4, 2026. https://www.yamahabicycles.com/globalassets/2020/all-bikes/civante/manuals/civante-owners-manual.pdf#page=81. Archived copy: https://web.archive.org/web/20260216090602/https://www.yamahabicycles.com/globalassets/2020/all-bikes/civante/manuals/civante-owners-manual.pdf.
98. Yamaha Motor Corporation, U.S.A. (yamahabicycles.com). Owner's manual: YDX MORO 05 07. PDF page 78. PDF created March 23, 2022. Accessed October 4, 2026. https://www.yamahabicycles.com/globalassets/2022-sept-product-launch/all-bikes/ydx-moro-05/assembly--owners-manual/ydx-moro-05-07-owners-manual.pdf#page=78. Archived copy: https://web.archive.org/web/20260821200640/https://www.yamahabicycles.com/globalassets/2022-sept-product-launch/all-bikes/ydx-moro-05/assembly--owners-manual/ydx-moro-05-07-owners-manual.pdf.
99. Yamaha Motor Corporation, U.S.A. (yamahabicycles.com). Owner's manual: YDX MORO 05 07. PDF page 84. PDF created March 23, 2022. Accessed October 4, 2026. https://www.yamahabicycles.com/globalassets/2022-sept-product-launch/all-bikes/ydx-moro-05/assembly--owners-manual/ydx-moro-05-07-owners-manual.pdf#page=84. Archived copy: https://web.archive.org/web/20260821200640/https://www.yamahabicycles.com/globalassets/2022-sept-product-launch/all-bikes/ydx-moro-05/assembly--owners-manual/ydx-moro-05-07-owners-manual.pdf.
100. Yamaha Motor Co., Ltd., e-Bike Systems (global.yamaha-motor.com), archived by the Internet Archive. Drive Unit | PW Series - e-Bike,Pedelec | YAMAHA MOTOR CO., LTD.. Page text. Undated page; captured September 28, 2013. Accessed October 4, 2026. https://web.archive.org/web/20130928080941/http://global.yamaha-motor.com:80/business/e-bike-systems/pw/0002.html.
101. Yamaha Motor Co., Ltd., e-Bike Systems (global.yamaha-motor.com). PWseries S2 - e-Bike Systems. Page text. Undated page. Accessed October 4, 2026. https://global.yamaha-motor.com/business/e-bike-systems/products36/pw-s2/. Archived copy: https://web.archive.org/web/20260513003538/https://global.yamaha-motor.com/business/e-bike-systems/products36/pw-s2/.
102. Yamaha Motor Co., Ltd., e-Bike Systems (global.yamaha-motor.com). PWseries C2 - e-Bike Systems. Page text. Undated page. Accessed October 4, 2026. https://global.yamaha-motor.com/business/e-bike-systems/products36/pw-c2/. Archived copy: https://web.archive.org/web/20260508131551/https://global.yamaha-motor.com/business/e-bike-systems/products36/pw-c2/.
103. Robert Bosch GmbH, Bosch eBike Systems (bosch-ebike.com). Performance Line CX: the sportiest Bosch motor for eMTBs. Comparison table 'Technical data' and its footnotes. Undated page. Accessed October 4, 2026. https://www.bosch-ebike.com/en/products/performance-line-cx. No public archived copy; saved as a local research deposit.
104. Robert Bosch GmbH. Bosch Group annual report 2011. PDF page 79. PDF created March 30, 2012. Accessed October 3, 2026. https://assets.bosch.com/media/en/global/bosch_group/our_figures/publication_archive/pdf_1/gb2011.pdf#page=79. Archived copy: https://web.archive.org/web/20260731113233/https://assets.bosch.com/media/en/global/bosch_group/our_figures/publication_archive/pdf_1/gb2011.pdf.
105. Yamaha Motor Corporation, U.S.A. (yamahabicycles.com). Yamaha Power Assist Bicycles, home page (models and suggested retail prices). Page text. Undated page. Accessed October 4, 2026. https://www.yamahabicycles.com/. Archived copy: https://web.archive.org/web/20260712025206/https://www.yamahabicycles.com/.
106. Yamaha Motor Corporation, U.S.A. (yamahabicycles.com). CrossCore RC Yamaha Power Assist Electric Bicycles. Page text. Undated page. Accessed October 4, 2026. https://www.yamahabicycles.com/bikes/crosscoreRC. Archived copy: https://web.archive.org/web/20260821200619/https://www.yamahabicycles.com/bikes/crosscoreRC.
107. Yamaha Motor Corporation, U.S.A. (yamahabicycles.com). WABASH RT Yamaha Power Assist Electric Bicycles. Page text. Undated page. Accessed October 4, 2026. https://www.yamahabicycles.com/bikes/WabashRT. Archived copy: https://web.archive.org/web/20260821200619/https://www.yamahabicycles.com/bikes/WabashRT.
108. Yamaha Motor Corporation, U.S.A. (yamahabicycles.com). CIVANTE Yamaha Power Assist Electric Bicycles. Page text. Undated page. Accessed October 4, 2026. https://www.yamahabicycles.com/bikes/civante. Archived copy: https://web.archive.org/web/20260821200619/https://www.yamahabicycles.com/bikes/civante.
109. Yamaha Motor Corporation, U.S.A. (yamahabicycles.com). YDX-MORO 07 Yamaha Power Assist Electric Bicycles. Page text. Undated page. Accessed October 4, 2026. https://www.yamahabicycles.com/bikes/ydx-moro-07. Archived copy: https://web.archive.org/web/20260821200619/https://www.yamahabicycles.com/bikes/ydx-moro-07.
110. California Legislature, Legislative Counsel (leginfo.legislature.ca.gov). California Vehicle Code § 312.5. § 312.5(a)(1), (a)(3), (d)(2). Amended by Stats. 2024, Ch. 791, Sec. 2. (SB 1271. Accessed October 4, 2026. https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=VEH&sectionNum=312.5. Archived copy: https://web.archive.org/web/20261004081031/https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=VEH&sectionNum=312.5.
111. California Legislature, Legislative Counsel (leginfo.legislature.ca.gov). California Vehicle Code § 24016. § 24016(d), (e). Amended by Stats. 2025, Ch. 37, Sec. 1. (AB 545. Accessed October 4, 2026. https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=VEH&sectionNum=24016. Archived copy: https://web.archive.org/web/20260830104334/https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=VEH&sectionNum=24016.
112. California Legislature, Legislative Counsel (leginfo.legislature.ca.gov). California Vehicle Code § 40000.1. § 40000.1. Added by Stats. 1971, Ch. 1178.. Accessed October 4, 2026. https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=VEH&sectionNum=40000.1. Archived copy: https://web.archive.org/web/20260424192845/https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=VEH&sectionNum=40000.1.
113. California Legislature, Legislative Counsel (leginfo.legislature.ca.gov). California Vehicle Code § 42001. § 42001(a)(1)-(2). Amended by Stats. 2006, Ch. 900, Sec. 3. Effective January 1, 2007.. Accessed October 4, 2026. https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=VEH&sectionNum=42001. No public archived copy; saved as a local research deposit.
114. California Legislature, Legislative Counsel (leginfo.legislature.ca.gov). California Vehicle Code, Division 17 (Offenses and Prosecution), Chapter 1, Article 1. Div. 17, Ch. 1, Art. 1: whole article read for § 24016. Added by Stats. 2010, Ch. 685, Sec. 3. (AB 2479. Accessed October 4, 2026. https://leginfo.legislature.ca.gov/faces/codes_displayText.xhtml?lawCode=VEH&division=17.&title=&part=&chapter=1.&article=1.. No public archived copy; saved as a local research deposit.
115. California Legislature, Legislative Counsel (leginfo.legislature.ca.gov). California Vehicle Code, Division 18 (Penalties and Disposition of Fees, Fines, and Forfeitures), Chapter 1, Article 1. Div. 18, Ch. 1, Art. 1: whole article read for § 24016. Amended by Stats. 2007, Ch. 749, Sec. 7.5. Effective January 1, 2008. Operative January 1, 2009, by Sec. 9 of Ch. 749.. Accessed October 4, 2026. https://leginfo.legislature.ca.gov/faces/codes_displayText.xhtml?lawCode=VEH&division=18.&title=&part=&chapter=1.&article=1.. No public archived copy; saved as a local research deposit.
116. Yamaha Motor Co., Ltd. (recall information, Japan; in Japanese). 電動アシスト自転車関連 (index of Yamaha's recall and free-repair notices for electric-assist bicycles). Notice text. Undated. Accessed October 4, 2026. https://www.yamaha-motor.co.jp/recall/pas/. Archived copy: https://web.archive.org/web/20260412100320/https://www.yamaha-motor.co.jp/recall/pas/.
117. Redtail eBikes (first-party dataset). CPSC recall records naming Yamaha, of 10,027 searched; none is an e-bike record (CSV). One row per record. October 4, 2026. Accessed October 4, 2026. https://cdn.shopify.com/s/files/1/1032/8847/1835/files/yamaha-ebike-motors_cpsc-search_20261004.csv?v=1791149946. No public archived copy; saved as a local research deposit.
118. Redtail eBikes (first-party dataset). EU Safety Gate alerts naming Yamaha, default ten-year window, and the e-bike queries that returned none, October 4, 2026 (CSV). One row per record. October 4, 2026. Accessed October 4, 2026. https://cdn.shopify.com/s/files/1/1032/8847/1835/files/yamaha-ebike-motors_safety-gate_20261004.csv?v=1791149949. No public archived copy; saved as a local research deposit.
119. U.S. Consumer Product Safety Commission. Recalls database (searched in full through the SaferProducts.gov Recalls REST web service). All 10,027 records, searched in every field. Undated; records to September 24, 2026. Accessed October 4, 2026. https://www.cpsc.gov/Recalls. Archived copy: https://web.archive.org/web/20261003011435/https://www.cpsc.gov/Recalls.
120. European Commission, Directorate-General for Justice and Consumers. Safety Gate: the EU rapid alert system for dangerous non-food products, alert search. Free-text searches for Yamaha, Yamaha e-bike, Yamaha bicycle, PW-X and Yamaha drive unit. Undated; default window of the last ten years. Accessed October 4, 2026. https://ec.europa.eu/safety-gate-alerts/screen/search?resetSearch=true. Archived copy: https://web.archive.org/web/20261003135656/https://ec.europa.eu/safety-gate-alerts/screen/search?resetSearch=true.
121. Yamaha Motor Co., Ltd. (recall information, Japan; in Japanese). 【無償修理】2020年モデル電動アシスト自転車の無償改修のお知らせ. Notice text. February 3, 2020. Accessed October 4, 2026. https://www.yamaha-motor.co.jp/recall/pas/2020-02-03/. Archived copy: https://web.archive.org/web/20260419170432/https://www.yamaha-motor.co.jp/recall/pas/2020-02-03/.
122. Yamaha Motor Co., Ltd. (recall information, Japan; in Japanese). 【無償修理】2012～2013年の一部のモデル用PASバッテリー無償交換のお知らせ. Notice text. January 26, 2021. Accessed October 4, 2026. https://www.yamaha-motor.co.jp/recall/pas/2021-01-26/index.html. No public archived copy; saved as a local research deposit.
123. Yamaha Motor Co., Ltd. (recall information, Japan; in Japanese). 【無償修理】2016～2018年に製造された一部のPASバッテリー（X0T型及びX0U型）無償交換のお知らせ. Notice text. April 5, 2022. Accessed October 4, 2026. https://www.yamaha-motor.co.jp/recall/pas/2022-04-05. Archived copy: https://web.archive.org/web/20260212224827/https://www.yamaha-motor.co.jp/recall/pas/2022-04-05.
124. Ministry of Economy, Trade and Industry, Japan (product safety, recall information). リコール情報: 電動アシスト自転車用バッテリー (recall information: batteries for electric-assist bicycles; Yamaha Motor, Bridgestone Cycle, Toyoda TRIKE, Asahi). Products, battery types, units. April 5, 2022. Accessed October 4, 2026. https://www.meti.go.jp/product_safety/recall/file/220405-1.html. No public archived copy; saved as a local research deposit.
125. Yamaha Motor Co., Ltd. (news release). Notice concerning Yamaha Motor's announcement on serious accidents involving the electric hybrid bicycle "PAS", in accordance with the consumer products safety law. Release text. May 31, 2007. Accessed October 4, 2026. https://global.yamaha-motor.com/news/2007/0531/info.html. Archived copy: https://web.archive.org/web/20260418174933/https://global.yamaha-motor.com/news/2007/0531/info.html.
126. Yamaha Motor Co., Ltd. (news release). Yamaha Main Display Models for the 35th Tokyo Motor Show 2001. Release text. October 17, 2001. Accessed October 4, 2026. https://global.yamaha-motor.com/news/2001/1017/tms.html. Archived copy: https://web.archive.org/web/20260612165142/https://global.yamaha-motor.com/news/2001/1017/tms.html.
127. Yamaha Motor Co., Ltd. (news release). The 32nd Tokyo motor show. Release text. October 22, 1997. Accessed October 4, 2026. https://global.yamaha-motor.com/news/1997/1022/tms.html. Archived copy: https://web.archive.org/web/20260120081424/https://global.yamaha-motor.com/news/1997/1022/tms.html.
128. Yamaha Motor Co., Ltd. (news release). Models to be Displayed at the 41st Tokyo Motor Show 2009 (Part 2). Release text. October 9, 2009. Accessed October 4, 2026. https://global.yamaha-motor.com/news/2009/1009/tms.html. Archived copy: https://web.archive.org/web/20260120084025/https://global.yamaha-motor.com/news/2009/1009/tms.html.
129. Yamaha Motor Co., Ltd. (news release). Main Models to be displayed at the 42nd Tokyo Motor Show 2011. Release text. November 9, 2011. Accessed October 4, 2026. https://global.yamaha-motor.com/news/2011/1109/tms.html. No public archived copy; saved as a local research deposit.
130. Yamaha Motor Co., Ltd. (news release). The 44th Tokyo Motor Show 2015 Yamaha Motor Main Display Models. Release text. October 16, 2015. Accessed October 4, 2026. https://global.yamaha-motor.com/news/2015/1016/tms.html. No public archived copy; saved as a local research deposit.
131. Yamaha Motor Co., Ltd. (news release). The 45th Tokyo Motor Show 2017 Yamaha Motor Main Display Models. Release text. October 12, 2017. Accessed October 4, 2026. https://global.yamaha-motor.com/news/2017/1012/tms.html. No public archived copy; saved as a local research deposit.
132. Yamaha Motor Co., Ltd. (news release). The Yamaha Motor Booth at the 46th Tokyo Motor Show 2019, “There Is Greater Joy Yet to Come”. Release text. October 10, 2019. Accessed October 4, 2026. https://global.yamaha-motor.com/news/2019/1010/tms.html. No public archived copy; saved as a local research deposit.
133. Yamaha Motor Co., Ltd. (news release). Introducing the Yamaha Booth at the Japan Mobility Show 2023- Co-exhibiting with Yamaha Corporation under the theme of "Feel Life" -. Release text. October 11, 2023. Accessed October 4, 2026. https://news.yamaha-motor.co.jp/news/2023/1011/jms.html. No public archived copy; saved as a local research deposit.
134. Yamaha Motor Co., Ltd. (Communication Plaza collection). Japan Mobility Show 2025 - Events. Collection record and specifications. Undated. Accessed October 4, 2026. https://global.yamaha-motor.com/showroom/event/japan-mobilityshow-2025/. Archived copy: https://web.archive.org/web/20260420092933/https://global.yamaha-motor.com/showroom/event/japan-mobilityshow-2025/.
135. Bicycle Retailer and Industry News. Yamaha ending US e-bike sales | Bicycle Retailer and Industry News. Article text. November 2, 2024. Accessed October 4, 2026. https://www.bicycleretailer.com/industry-news/2024/11/03/yamaha-ending-us-e-bike-sales. Archived copy: https://web.archive.org/web/20260508160259/https://www.bicycleretailer.com/industry-news/2024/11/03/yamaha-ending-us-e-bike-sales.
136. Yamaha Motor Corporation, U.S.A. (yamaha-motor.com). E-Bike parts shop and E-Bike models page. Rendered page text. Undated page. Accessed October 4, 2026. https://yamaha-motor.com/shop/e-bike. Archived copy: https://web.archive.org/web/20260806064513/https://yamaha-motor.com/shop/e-bike.
137. Yamaha Motor Corporation, U.S.A. (yamahabicycles.com). YDX-MORO Yamaha Power Assist Electric Bicycles. Page text. Undated page. Accessed October 4, 2026. https://www.yamahabicycles.com/bikes/ydx-moro. Archived copy: https://web.archive.org/web/20260821200619/https://www.yamahabicycles.com/bikes/ydx-moro.
138. Yamaha Motor Corporation, U.S.A. (yamahabicycles.com). YDX-MORO PRO Yamaha Power Assist Electric Bicycles. Page text. Undated page. Accessed October 4, 2026. https://www.yamahabicycles.com/bikes/ydx-moro-pro. Archived copy: https://web.archive.org/web/20260821200619/https://www.yamahabicycles.com/bikes/ydx-moro-pro.
139. Yamaha Motor Corporation, U.S.A. (yamahabicycles.com). YDX-MORO 05 Yamaha Power Assist Electric Bicycles. Page text. Undated page. Accessed October 4, 2026. https://www.yamahabicycles.com/bikes/ydx-moro-05. Archived copy: https://web.archive.org/web/20260821200619/https://www.yamahabicycles.com/bikes/ydx-moro-05.
140. Yamaha Motor Corporation, U.S.A. (yamahabicycles.com). YDX-MORO 07 Yamaha Power Assist Electric Bicycles. Page text. Undated page. Accessed October 4, 2026. https://www.yamahabicycles.com/bikes/ydx-moro-07-30th-anniversary. Archived copy: https://web.archive.org/web/20260821200619/https://www.yamahabicycles.com/bikes/ydx-moro-07-30th-anniversary.
141. Yamaha Motor Co., Ltd., e-Bike Systems (global.yamaha-motor.com). GLOBAL SALES NETWORK - e-Bike Systems. Page text. Undated page. Accessed October 4, 2026. https://global.yamaha-motor.com/business/e-bike-systems/sales-network/. Archived copy: https://web.archive.org/web/20260821200530/https://global.yamaha-motor.com/business/e-bike-systems/sales-network/.
142. Yamaha Motor Co., Ltd. (news release). Yamaha Motor's electrically power assisted bicycles Receive Japan's Technology Management and Innovation Award — Have contributed to society since release as world's first electrically power assisted bicycles in 1993 —. Release text. January 27, 2020. Accessed October 4, 2026. https://global.yamaha-motor.com/news/2020/0127/pas.html. No public archived copy; saved as a local research deposit.
143. Redtail eBikes (first-party dataset). Which of our 224 active bike-catalog listings name a Yamaha motor, October 4, 2026 (CSV). One row per record. October 4, 2026. Accessed October 4, 2026. https://cdn.shopify.com/s/files/1/1032/8847/1835/files/yamaha-ebike-motors_shelf-count_20261004.csv?v=1791149952. No public archived copy; saved as a local research deposit.
144. Yamaha Motor Corporation, U.S.A. (yamahabicycles.com). Owner's manual: CIVANTE. PDF page 82. PDF created April 13, 2020. Accessed October 4, 2026. https://www.yamahabicycles.com/globalassets/2020/all-bikes/civante/manuals/civante-owners-manual.pdf#page=82. Archived copy: https://web.archive.org/web/20260216090602/https://www.yamahabicycles.com/globalassets/2020/all-bikes/civante/manuals/civante-owners-manual.pdf.
145. Redtail eBikes (first-party dataset). Yamaha's 15 PAS free-repair notices in Japan, 2007-2025, with what each covers (CSV). One row per record. October 4, 2026. Accessed October 4, 2026. https://cdn.shopify.com/s/files/1/1032/8847/1835/files/yamaha-ebike-motors_recalls-japan_20261004.csv?v=1791149943. No public archived copy; saved as a local research deposit.
146. Redtail eBikes (first-party dataset). The PDF page of every passage this page cites to a page of a PDF, re-found on that page (CSV). One row per record. October 4, 2026. Accessed October 4, 2026. https://cdn.shopify.com/s/files/1/1032/8847/1835/files/yamaha-ebike-motors_pinpoints_20261004_d6813a17-8349-4c5a-a8ba-2f8e6e98e81f.csv?v=1791152910. No public archived copy; saved as a local research deposit.
147. Playcut. Playcut Brush. The image credit in the method section. Current. Accessed October 4, 2026. https://playcut.ai/tools/claude-code-image-generation/. A credit for the cover, not a source for any fact.
148. Playcut. Playcut. The image credit in the method section. Current. Accessed October 4, 2026. https://playcut.ai. A credit for the cover, not a source for any fact.
149. commons.wikimedia.org. File:Japan-Mobility-Show-2025-RuinDig 2044.jpg. The image credit in the method section. Current. Accessed October 5, 2026. https://commons.wikimedia.org/w/index.php?curid=180874926. A credit for the cover, not a source for any fact.
150. creativecommons.org. Creative Commons Attribution 4.0 International (CC BY 4.0). The image credit in the method section. Current. Accessed October 5, 2026. https://creativecommons.org/licenses/by/4.0/. A credit for the cover, not a source for any fact.