Samebike CY20 Pro Review 2026: $599, 468 Wh, Folds

Folding 20-inch frame · 500 W rear hub, 800 W peak · 36 V 13 Ah, 468 Wh · 19.9 mph top speed · thumb throttle and 5 assist levels · 20 × 3.0 tires · 68 lb · 330 lb load · $599 · verified September 26, 2026

Quick Answer — The Samebike CY20 Pro is a $599 folding e-bike with a 500 W rear hub, a 468 Wh battery and 20 × 3.0 tires; it folds to 34.6 × 19.3 × 33.5 inches. Pedaling easily at 15 mph on the flat, a 180 lb rider gets a computed 46 miles per charge; Samebike says up to 90 km (56 miles).

On the throttle alone the same rider gets about 29 miles at 15 mph. The range section turns Samebike's numbers into your ride, and the fit section shows which heights the seat post suits.

What this review covers

What $599 buys · What it is · Fit · The motor · The battery · How far it goes · Brakes, light and horn · Fork, tires and wheels · The fold · Weight and load · The Mercer fit test · UL · Recalls · The class question · Where to ride it · Green and red flags · The verdict · Checklist · Buying it from us · FAQ · Limitations · The bottom line · References

How we verified this Samebike CY20 Pro review

Every figure here was read on September 26, 2026 from Samebike's CY20 Pro product page, its product record, the CY20 Pro manual, our listing or the federal texts quoted in the class and trail sections. The range and fit figures are computed, and each section names its inputs.

This review is specification-verified: every number is Samebike's, a cited source's, or arithmetic shown on this page. We sell the CY20 Pro, so weigh the red flags as carefully as the green ones.

Written by Milad Ghobadibeygvand, BScN (Western University, 2014). Corrections: support@redtailebikes.com.

What $599 buys

Sources: Samebike's product page (stat strip, specification table, size-and-fit list, feature panels) and the manual's specification page, both read September 26, 2026. Where Samebike prints two figures for one thing, the table carries the one we plan on and Limitations lists the other.

A 68-pound folder with a 500 W hub and a seat you can raise 6 inches

The CY20 Pro is a small-wheeled folding e-bike built for the commute and the trunk. A low step-through frame folds at a hinge in the middle, the handlebar stem folds down beside it, and the battery sits in the seat tube behind the rider's legs (the manual's folding and battery pages).

Samebike's FAQ describes it as "a lightweight folding electric bike that is perfect for city riding and commuting, and can also be carried for travel." It comes in two versions: this one with cast "Solid Wheel" rims and a 36 V pack, and a Spoked Wheel version at the same $599 with a 48 V pack.

Samebike's studio view with the handlebar stem folded down: the step-through frame, the pack in the seat tube, and the padded rack over the rear wheel.

Check the model name on any figure you read. Samebike also sells a plain CY20 in Europe, a different folder on 20 × 2.35 tires, and its own comparison of the two (July 25, 2026) gives the European CY20 Pro a 48 V pack.

The Pro here is the one Samebike's US store lists as 36 V 13 Ah with 20 × 3.0 tires; 36 × 13 is 468 watt-hours. When a figure you read does not match those numbers, check which CY20 it describes.

Samebike's own photograph of the CY20 Pro in use; the rider is seated upright, which the fit section measures.

Will the CY20 Pro fit you?

On its drawn seat post, the CY20 Pro's saddle reaches the fit formula's height for 99 of every 100 riders at 5'4" and 5'6", 96 of 100 at 5'8" and 75 of 100 at 5'10"; at 6'0" the count falls to 30 of 100, and at 5'0" to 41.

The median rider leans 5 to 11 degrees from upright to reach the grips, and with a relaxed back the hands carry 8 to 14 percent of body weight. The model places the 6,068 bodies the US Army measured for its 2012 survey on Samebike's own drawing and sets each saddle at 109% of inseam.

To find your place on this frame:

1. Measure your inseam in socks. Stand with your back to a wall, pull a hardcover book up firmly between your legs where a saddle would sit, and measure from the floor to its spine.
2. Find your height in the tables below and check that your inseam falls inside that row's range.
3. Fine-tune on delivery with the knee and heel checks at the end of this section.

Samebike prints two recommended-height windows for this bike, and the drawing shows the seat higher than its listed figures. Read at the scale of the published wheelbase, Samebike's seat heights match the drawing measured to the seat clamp; the saddle itself adds about 3.3 to 3.6 inches above that.

Samebike's drawing, scaled to its published 1,135 mm wheelbase. The overall length and both seat heights read to the clamp agree with the listed figures to within 3.5 percent and the highest handlebar setting to 0.0 percent; the lowest handlebar setting reads 4.1 percent above its listed figure.

Will the saddle go high enough for me?

From 5'4" to 5'8", yes for 96 to 99 of every 100 riders; at 5'10" for 75, and at 6'0" for 30. The formula puts the top of the saddle at 109% of your inseam, measured from the pedal axle (Peveler et al., 2005), and published work accepts settings as low as 106% (Ferrer-Roca et al., 2012).

The height off the floor then depends on the crank axle, 12.3 inches up, the 178 mm cranks and the 76-degree seat post, all measured on Samebike's drawing.

Floor-to-saddle height for the typical rider at each height, and how many of 100 riders at that height have their 109% and 106% saddle heights inside the drawn seat post's 35.7 to 41.8 inches; Army survey bodies, men and women together. At 4'11" and 5'0" most riders need a saddle lower than the post's 35.7 inches; at 6'0" the riders the post does not reach sit a median of about 0.9 inches low.

At the short end the lowest saddle is the question. At 5'0" the formula height of the median rider, 35.4 inches, sits just under the 35.7-inch floor, so 41 of 100 riders that height reach it and the rest ride with the knee a little more bent than the formula sets.

At the tall end the post runs out: at 6'0" it reaches 109% for 30 of 100 riders, and the rest ride with the saddle below the formula height.

Can I put a foot down at a stop?

Easily: the step-through frame's lowest top edge sits 15.2 inches off the ground, and 95 of every 100 riders at every height in the table clear it by at least 11.6 inches.

That low top edge is the frame's strong suit. You step through the gap in front of the saddle, so nothing asks you to swing a leg over the back.

Barefoot inseam minus the 15.2-inch step-over height measured on Samebike's drawing at the wheelbase scale; each cell is the clearance that 95 of 100 riders at that height have or exceed.

Will I feel cramped, or stretched?

Neither, for most riders: the median rider leans 5 to 11 degrees from upright, because the grips sit 29.8 to 33.0 inches above the crank axle and 12.3 to 14.8 inches ahead of it at the lowest bar setting.

Twenty recreational cyclists, asked to rank three trunk positions, rated the most upright one the most comfortable (Priego Quesada et al., 2017). Each angle below is the least lean that lets a straight arm meet the grip from the sit-bone position, worked out from that body's measured torso and arm.

Trunk lean from vertical for the median rider at each height, at the drawn (lowest) handlebar setting; the range runs across the saddle's travel and the grips' size. Samebike's stem raises the bar about 6 inches above the setting the model uses.

How much weight goes through my wrists?

Up to 8 to 14 percent of your body weight with a fully relaxed back. In a lab study, 10 road racers pedaling with their hands on the hoods put 15% of their weight through the bars (Carahalios, 2015); on the CY20 Pro's tall grips the median rider's relaxed-back ceiling stays below that figure at every height in the table.

A forward lean moves the load onto the heel of the hand, over the ulnar nerve, and in 36 riders that pressure was highest in the most stretched-out hand position (Slane et al., 2011).

The most the hands carry with a relaxed back, computed from each body's segment weights (Clauser et al., 1969) at the survey's median weight for that height; the range spans the saddle and grip positions.

How do I set the saddle when it arrives?

Set it so your knee still bends 25 to 35 degrees with the pedal at the bottom of the stroke (Peveler et al., 2007). The quick version is the heel method: sit on the saddle, put your heel on the lowest pedal, and raise the saddle until that leg just straightens; riding on the ball of the foot then leaves the right bend.

In 19 cyclists the heel method put 70% in the 25-to-35-degree range, more than either inseam formula did (Peveler et al., 2005). Before each ride, the manual asks you to "check the brake, wheel, handlebar, folding buckle, quick release part of the electric bike", so tighten the seat clamp once the height is right.

How we computed fit

Three rules drive this section: the saddle sits 1.09 × inseam above the pedal axle, the lean is the least trunk angle that lets a straight arm reach the grip, and the hand load is the upper body's weight times its lean divided by the reach to the grip.

Take a 5'8" rider with the median 32.6-inch inseam: the formula needs 35.6 inches from the pedal, which is 28.6 inches from the crank axle (88.3% of inseam gives 28.8), and a floor-to-saddle height of 39.9 inches, inside the drawn post's 35.7 to 41.8 inches.

Before any length was taken from the drawing, the drawing was held against Samebike's own figures.

Every length is scaled from the published 1,135 mm (44.7 in) wheelbase, measured between the axle centers found by fitting a circle to each tire. Samebike's seat and handlebar heights fit its drawing when read to the seat clamp and the grips; read to the top of the saddle, the seat figures come out 10 to 13 percent higher, and both readings are printed.

A 500 W rear hub with an 800 W peak

Samebike rates the CY20 Pro's motor at 500 W with an 800 W peak, and one of its gallery images names it a "36v 500w powerful brushless motor". Peak is the short burst the motor gives when you pull away or climb; 500 W is what it is rated to sustain.

The page prints "55+Nm" of torque in its subtitle and again in the throttle panel. Our range model caps the motor at 50 N·m, the figure the same throttle panel printed on August 30, 2026, so its climbing figures lean cautious.

The motor sits in the rear hub; the seven-cog freewheel threads onto it, and the Shimano derailleur moves the chain across the cogs.

Each ride starts from one of two inputs. The thumb throttle moves the bike with no pedaling, which Samebike describes as "full electric drive", and the five assist levels add help while you pedal. Samebike's page also lists a "Torque Mode" for "Instant power for when you need extra speed or tackle hills" and a "Cadence Mode" for "Smooth, steady assist", and describes the bike as "Paired with a torque sensor and high-torque motor".

The thumb throttle sits under the Shimano seven-speed shifter, within reach of the thumb on the grip.

The seven gears change your cadence, not the motor's. A hub motor turns with the wheel, so shifting sets how fast your legs spin at a given speed, and the gear you pick moves the battery only through how much you pedal (the gear table).

The 36 V 13 Ah battery: 468 Wh, 6 to 8 hours to charge

36 V × 13 Ah is 468 watt-hours, and Samebike's range graphic prints the same 468 beside the CY20 Pro. Every range figure below starts from it.

The pack rides in the seat tube under the saddle; the manual removes it by flipping the saddle forward and turning the key in the lock.

Plan on 6 to 8 hours to charge from empty, Samebike's figure. The manual's charger outputs "42V2A", and 13 Ah at 2 A is 6.5 hours by plain division, near the low end of that range. You can charge it on the bike or take the pack out, and the manual shows both: the charger's light turns red while it charges.

Samebike's range figures set a ceiling on what each mile may draw from those 468 Wh:

468 Wh divided by each figure. The range section finds the steady ride that fits each row.

How far the CY20 Pro goes on one charge

On flat pavement a 180 lb rider covers about 29 miles on a full charge at 15 mph on the throttle, 23 at 18 mph, and 46 at 15 mph with easy pedaling. Up a 4% grade at 10 mph on the throttle, the same charge lasts 11 miles.

To find your own figure:

1. Choose your speed and effort in the first two tables.
2. Set aside 150 to 197 Wh of the 468 for each 1,000 feet you climb on the throttle at 10 mph (the hill table).
3. Correct for your weight and the temperature, then plan on 75% of the answer.

Every table works out one steady ride at a time, from Samebike's specifications, Bafang's published figures for a comparable geared hub motor, drum measurements of ten fat tires standing in for the CY20 Pro's 20 × 3.0 ones, and a road-cycling power model validated on a real road. The formula and one worked ride close the section.

Does riding faster cut range? Miles at each speed

Speed costs the most on the flat. The charge that carries you 41 miles at 10 mph carries you 23 at 18 mph, because the air takes more power with every mile per hour and it rises with the cube of the speed.

Throttle only, flat pavement, a 180 lb rider plus the 68 lb bike, 77 °F. The last column keeps 25% in the pack, the share a measured pedelec left unused in a standard range test (Schmitt, Decker and Doppelbauer, 2019). The model's fastest steady speed on the flat is 19.3 mph, just under Samebike's 32 km/h (19.9 mph).

Nothing in these tables adds more range than light pedaling: at 15 mph, 75 W from you stretches a full charge from 29 miles to 46. Easy pedaling here means 75 W from you, steady pedaling 150 W. Without the motor, 75 W would move this bike at about 9.1 mph on level pavement and 150 W at about 13.2, so pick the column that matches what you could hold on your own.

Miles from a full charge, flat pavement, a 180 lb rider; at 15 mph easy pedaling draws 10.2 Wh a mile against 16.3 on the throttle. In the 103-mile cell your legs do most of the work, so it leans hardest on the model's least certain part, its motor losses at light load (Limitations item 5).

The assist level is the controller's rule for how much it adds while you pedal. Whichever level you ride, read the row for the speed you hold and the effort you give.

Which gear saves battery? On a hub motor, your effort does

Shift for your legs; pedal for the battery. The hub turns with the wheel whatever gear you choose, so a shift changes your cadence and nothing about the motor. What changes the draw is how many watts you add:

Watt-hours from the battery per mile, a 180 lb rider. A dash means the model's motor cannot hold that speed on that grade with that effort.

Use the low gears to keep your legs turning on a climb, where a steady 150 W halves what the battery spends at 12 mph up a 4% grade, from 44.5 Wh a mile to 23.5.

Does going uphill drain the battery faster?

Yes: at 10 mph on the throttle up 4 to 8% grades, each 1,000 feet of climbing takes 150 to 197 Wh more than the same distance on level ground. Lifting a 180 lb rider and the 68 lb bike 1,000 feet takes 94 Wh at the wheel; the motor and the pack lose the rest.

Throttle only and with easy pedaling at 10 mph, a 180 lb rider. Grades from 10% up are left out: the model caps the motor at 50 N·m, and at 10 mph it cannot hold them on the throttle. The manual prints a "Max Angle of Climb" of 25 degrees, a slope the model does not price.

Price a hilly ride as its level miles plus its climbing. Ten flat miles at 15 mph on the throttle take about 163 Wh, and 500 feet of 6% climbing adds about 85, near 248 Wh of the 468 in all. Stops, starts and wind come on top, because the model rides each mile at a steady pace.

Does rider weight affect range?

Weight costs a little on the flat and a lot uphill. A heavier load raises the cost of the tires and the hill but not of the air, so the gap widens on a climb.

Everyone and everything on the bike, with the bike's own 68 lb added in each row because the motor moves it too; throttle only. The 330 lb row is Samebike's load capacity. "Past the model's motor" means it cannot hold 10 mph up 8% at that weight on the throttle; pedal, or climb slower.

Going from 180 to 330 lb takes 6 miles off the level 15 mph ride, 29 down to 23. On the 8% climb the difference decides whether you ride it on the throttle at all.

Does cold weather drain the battery?

Yes: freezing air takes the 15 mph throttle ride from 29 miles at 77 °F down to about 23, and 14 °F takes it to about 20.

Flat pavement, a 180 lb rider, throttle only. The central figure is the energy recomputed from McMaster University's LG HG2 cell data at a 0.5C discharge; 77, 50, 32 and 14 °F were measured and the rows between are interpolated, with the cells taken to be at air temperature. The brackets show where published cell data disagree (Limitations item 9).

Freezing air hits three ways at once: the cells give back about 89% of their 77 °F energy, the air is about 9% denser by the gas law the U.S. Standard Atmosphere uses, and cold rubber rolls harder, by about 0.9% for every degree Celsius, a rate between Rothhämel's fit for a 42 mm tire and Bicycle Rolling Resistance's road-tire average, held at its 41 °F value below 41 °F.

Do the tires cut range? Tires and riding position

On level ground the tire you roll on moves your range as much as a few miles per hour does. Bicycle Rolling Resistance's drum put ten 26 × 4.00 fat tires between 23.2 and 42.1 W at 12 psi, 18 mph and a 94 lb load. Its fat-bike table lists no 20-inch tire, so the model borrows the median of the ten for the CY20 Pro's.

Miles from a full charge, throttle only, flat pavement, a 180 lb rider. The lowest of the ten is Schwalbe's Jumbo Jim LiteSkin and the highest Kenda's Juggernaut Pro.

Keep the tires at the pressure printed on their sidewalls, which is where the manual sends you: "According to the actual information on the tire". Samebike's page for the Spoked Wheel CY20 Pro, on the same 20 × 3.0 size, prints 40–65 psi.

Posture counts as speed climbs. Tengattini and Bigazzi measured 37 upright cruiser riders at 0.640 m² of drag area, the value this model uses, and 90 everyday mountain-bike riders at 0.603 m², which would take the 18 mph throttle ride from 23 miles to 24.

Samebike's 90 km, matched to real rides

Samebike prints range three ways for the CY20 Pro, and each matches a different steady ride. Its page says the top figure was "Measured in Mode 1, Level1 pedalassist under controlled conditions".

• 90 km (56 miles) allows 8.4 Wh a mile: about 13.9 mph pedaling easily, or 17.1 mph pedaling steadily, on flat pavement.
• The manual's 37 to 43 miles on pedal assist allows 10.9 to 12.6 Wh a mile: about 15.5 to 16.6 mph pedaling easily.
• The manual's 18 to 22 miles on pure electric allows 21.3 to 26.0 Wh a mile. The 22-mile end is the throttle at 18.5 mph; the 18-mile end draws more than any steady flat ride the model holds, so it describes stops, hills, wind or a heavier load.

So Samebike's numbers line up with gentle pedaled riding at the top and with throttle riding near the speed limit at the bottom.

Plan on 75% of any figure here, the share of its pack a measured pedelec used in a standard range test (Schmitt, Decker and Doppelbauer, 2019). On the throttle at 15 mph, that turns 29 miles into 21.

How every figure here is worked out

A steady speed needs a steady supply of power at the wheel. Martin and colleagues' model, checked against riders on a road in 1998, gives that power in one line for a constant speed in still air:

Power at the wheel = v × [ m × g × (Crr × cos θ + sin θ) + ½ × ρ × CdA × v² ]

Here v is the speed, m the mass of the rider, cargo and bike together, g gravity, θ the slope angle, Crr the tires' rolling resistance (0.0105 means a drag of 1.05% of the weight on the tires), ρ the air density and CdA the drag area, a measure of how much air the rider pushes aside.

Four steps separate the wheel from the battery:

1. Your pedaling reaches the rear wheel through the chain at 97.7% efficiency, Martin and colleagues' figure, and the motor makes up the rest.
2. The motor is modeled on the published figures of a comparable motor. Bafang's 2021 OEM workbook lists its RM G0H0 geared hub with an n0 of 510 rpm and an nT of 426 rpm and an efficiency of "≥ 80" percent. The model keeps that shape at the CY20 Pro's own 36 V and 500 W, sets its no-load speed at 21.7 mph, Samebike's highest published top speed for the bike, and caps its torque at 50 N·m.
3. The pack loses a little inside itself, by the battery efficiency Arango, Lopez and Ceren measured on a 48 V pack.
4. Watt-hours per mile = battery watts ÷ mph, and miles = 468 Wh × the share of the pack's energy the temperature allows ÷ watt-hours per mile.

One ride, worked through: 15 mph on flat pavement on the throttle, a 180 lb rider. The tires take 78.1 W and the air 114.2 W, so the wheel needs about 192 W.

At 15 mph the wheel turns at 234 rpm. In the motor model (1.015 N·m of torque per amp, a 0.342 Ω winding and a 0.73 A no-load current, each worked out from Bafang's published figures at 36 V), the motor gives 7.8 N·m on 8.5 A at 82% efficiency.

Counting the pack's own losses, the battery supplies 244.9 W: 16.3 Wh a mile at 15 mph, and 468 ÷ 16.3 is 28.7 miles, or 21.5 with 25% kept.

The benchmarks under the model, recomputed. Each half of the model reproduces a figure its source prints:

Martin and colleagues' Appendix I example (a ground speed of 8.36 m/s, a 90 kg system on a 0.3% grade), Bafang's rated point for the RM G0H0, and the CY20 Pro manual's pure-electric range, the last matched by a steady ride below the bike's 19.9 mph limit.

No measured ride of the CY20 Pro to empty, with its speed and load stated, was found to check the whole chain; Limitations item 5 says which inputs that leaves unchecked.

Brakes, light and horn

Samebike fits mechanical disc brakes at both wheels, a cable pulling each caliper, which it describes as providing "reliable stopping power for your bike with less maintenance". The manual's packing list puts five Allen wrenches, three wrenches and a screwdriver in the box with the charger.

The rear caliper and rotor; the cable enters the caliper from above.

The manual gives one braking instruction for fast riding: "when emergency braking, brake the rear wheel first, then brake the front wheel", because "There is a danger of tipping over if you brake the front wheel suddenly".

The handlebar carries the rest. The manual's display section switches the headlight from the "+" button, its specification lists an "Electric Horn Installed", and its overall view labels taillights at the back of the bike.

The LCD shows speed, battery level and distance, with buttons for the five assist levels.

The display does more than show the speed. Held down while stationary, the "−" button starts the 6 km/h walk mode for pushing the bike up a ramp, and held while riding it sets cruise control; its screen can read trip, total and average figures in miles or kilometers (the manual).

A front fork, 20 × 3.0 tires and cast wheels

The suspension is a front fork. Samebike's specification table lists "Suspension: Front fork", and the rear triangle in its photographs is rigid, so the padded saddle is the cushioning at the back.

The tires are 20 × 3.0 inches, wider than a commuter tire, with reflective strips along each sidewall that Samebike says make "driving at night safer". The "Solid Wheel" in the name refers to the cast five-arm rims, which carry no wire spokes.

The front wheel from Samebike's photograph of the bike in use: the 20 × 3.0 tire on a cast wheel, with the disc brake behind it.

At 3.0 inches wide the tires cushion more than a narrow commuter tire and roll a little harder, which the tire table prices in miles.

The fold: 34.6 × 19.3 × 33.5 inches

Folded, the CY20 Pro measures 880 × 490 × 850 mm, 34.6 × 19.3 × 33.5 inches, and Samebike's FAQ says it "can be folded and stored in the trunk of a car". Measure your trunk's opening and depth against those three numbers before you count on it.

Folded: the frame hinges in the middle, the front wheel swings back beside the rear, and the stem folds down.

The manual's folding steps run in three moves: fold the handlebar, open the frame's folding buckle, and swing the front half back. Folding makes the bike smaller, not lighter: the same 68 lb goes into the trunk, so plan the lift.

Over the rear wheel sits a padded rack, which Samebike calls an "Extended rear seat cushion", "Lengthened and thickened for greater comfort".

The padded top of the rear rack, which Samebike lengthened and thickened.

68 pounds and a 330-pound capacity

Samebike publishes 31 kg (68 lb) for the CY20 Pro and a 150 kg (330 lb) load capacity; the manual prints "E Bike Weight 68 Ibs (31kg)" and "Max Load 330 Ibs (150kg)".

A 200 lb rider with 40 lb of groceries is 240 lb, inside the 330 lb even with the bike's own 68 lb added. If your load comes near the line, email us and we will ask Samebike in writing how it counts the 330 lb before you order.

The box weighs 81.5 lb and measures 1420 × 230 × 645 mm (55.9 × 9.1 × 25.4 in), per the manual, so have a second pair of hands at delivery.

The Mercer fit test

Each review we publish puts the bike in front of the same seven people, the Mercers, so every machine answers the same fit questions (meet the Mercers). Each verdict below rests on a figure Samebike publishes (its two height windows, the weight, the load capacity) or on the fit tables computed from its drawing.

Maya and Jack show where the CY20 Pro divides a family. At 5'6", Maya fits the drawn post for 99 of 100 riders her height and the fold solves her storage; at 6'1", Jack is inside both of Samebike's windows, yet the post reaches the formula height for 13 of 100 riders his height, and the 26-inch CREST is the Samebike to look at for his frame.

Is it UL certified?

Samebike's photographs of the CY20 Pro carry a UL 2849 mark. The studio images in its US product gallery, added on September 11, 2026, show a TÜV SÜD badge reading "UL 2849". UL 2849 is the standard for e-bike electrical systems, which UL Solutions describes as fire safety certification "by examining the electrical drive train, battery, and charger system combinations in e-bikes".

If a landlord, a building manager or an insurer asks for the certificate itself, email us and we will ask Samebike in writing for the certificate number before you order.

Has it been recalled?

No. On September 26, 2026 no recall in the Consumer Product Safety Commission's recall database named Samebike, its maker Guangzhou Sameway or the CY20. We searched the title, product-name and manufacturer fields for Samebike, Same bike, Samebikes, Sameway and Guangzhou Sameway, and read 623 bicycle, e-bike, battery and scooter recalls field by field.

The CPSC's site search, which also carries its consumer warnings, returned no result for Samebike or Sameway the same day. The same searches return the recalls and warnings on file for other e-bike and bicycle brands, so an empty answer here is a real one.

The class question: 500 W and 19.9 mph

Samebike's US page assigns the CY20 Pro no class, so the definition in your state decides what it counts as where you ride. Those definitions test three things, and Samebike publishes all three: a 500 W rated motor with an 800 W peak, a 32 km/h (19.9 mph) top speed on its specification table, and a thumb throttle that moves the bike without pedaling.

Federal consumer-product law, 15 U.S.C. § 2085, puts low-speed electric bicycles under the Consumer Product Safety Commission's bicycle rules, and subsection (b) defines one as "a two- or three-wheeled vehicle with fully operable pedals and an electric motor of less than 750 watts (1 h.p.), whose maximum speed on a paved level surface, when powered solely by such a motor while ridden by an operator who weighs 170 pounds, is less than 20 mph."

Sources: 15 U.S.C. § 2085 and Samebike's product page, each read on September 26, 2026.

Where a watt line or a speed line decides your ride, ask us before you order. The federal definition does not say whether its 750 W means peak or continuous output, and Samebike prints two top speeds for the bike. Email us and we will ask Samebike in writing for the power and speed figures of the bike you order.

Check your insurance as well. The manual says "Your current insurance business may not cover the situation you may encounter when riding an electric bike" and tells you to "contact your insurance company or insurance broker". Our 50-state e-bike law atlas prints each state's definition.

Where you can ride it

A bike path, a bike lane or a trail answers to whoever manages it. Where the rule is posted by class, a trail open to class 1 bikes only is closed to the CY20 Pro: on federal land a class 1 motor "provides assistance only when the rider is pedaling" (43 CFR 8340.0-5(j)(1)), and the CY20 Pro's thumb throttle moves it without pedaling.

Federal land managers start from the e-bike classes. On Bureau of Land Management ground, 43 CFR 8340.0-5 defines the e-bike's motor as "an electric motor of not more than 750 watts (1 h.p.)" in three classes, and treats an e-bike as a non-motorized bicycle only where "the authorized officer has expressly determined" so.

Each row answers to a different document, and none of them is a spec sheet.

Our public-land e-bike guide takes each federal agency in turn.

Green flags / Red flags

Green flags

• $599 on both stores: Samebike's own price on September 26, 2026, with $899 shown as the regular price on both.
• A fold that fits a trunk: 34.6 × 19.3 × 33.5 inches, per Samebike's FAQ and manual.
• Free shipping and a claim we file: free delivery to the contiguous United States, and if it arrives damaged and you tell us within 48 hours, we file the carrier claim for you.
• A removable 468 Wh pack: a computed 46 miles at 15 mph with easy pedaling for a 180 lb rider, charged on or off the bike in 6 to 8 hours.
• A low step-through: the frame's lowest edge sits 15.2 inches off the ground.
• A throttle, five assist levels and seven gears, with a 6 km/h walk mode and cruise control on the LCD.
• A 330 lb load capacity on a 68 lb bike.

Red flags

These are about fit: who the CY20 Pro is wrong for, and where to look instead.

• Wrong if you are 6'0" or taller. The drawn seat post reaches the formula height for 30 of 100 riders at 6'0" and 13 of 100 at 6'1"; the 26-inch CREST lists a seat to 40.5 inches, and its review finds its post at the formula height for 92 of 100 riders at 6'0" and 77 at 6'1".
• Wrong if the bike must go up stairs every day. It weighs 68 lb folded or not; send us your stairs and your storage and we will match a bike from our folding collection.
• Wrong for steep climbs with a heavy load on the throttle. Past 180 lb the model's motor cannot hold 10 mph up an 8% grade; the 1,000 W LO26 Plus folds too, with twice the rated motor.
• Wrong for rough trails. A front fork, 20 × 3.0 tires and cable discs are commuter parts; the full-suspension RS-A02 Pro folds on 20 × 4.0 tires, and our RS-A02 Pro review maps its range and fit.
• Wrong if you want hydraulic brakes. The CY20 Pro's discs are mechanical; the LO26 Plus carries hydraulic discs at $999, and our LO26 Plus review shows its taller drawn saddle, 37.4 to 42.1 inches.
• Wrong for trails open to class 1 bikes only. The throttle rules it out there; our public-land guide quotes each agency's wording, and we will check your trail with you.
• Wrong for a rider under your state's age line. Our 50-state atlas sets out each state's age rules, and we will suggest a bike that fits the rider and the rule.

Buy it if / Buy something else if

Buy it if you ride a city commute or errands on pavement; you need a bike that folds for a car trunk, a closet or an office corner; you are between about 5'2" and 5'10", where the drawn post suits most riders; and you want a throttle and pedal assist at a price that leaves room for a helmet and a lock.

For $599 you get a 500 W hub, a removable 468 Wh pack, a front fork, 20 × 3.0 tires, seven gears, a headlight and a horn. On our listing, Shop Pay offers four interest-free installments, and its sample plans read $199.67 every two weeks for six weeks at 0% APR, $599 in total, or $54.06 a month for 12 months at 15% APR, $648.72 in total, each subject to an eligibility check.

Buy something else if you are 6'0" or taller, where the CREST's taller seat is the Samebike to measure against; if your route is dirt or sand, where the full-suspension RS-A02 Pro folds on 4-inch tires; or if you want hydraulic brakes, which the LO26 Plus carries.

Its twin with spokes, the CY20 Pro Spoked Wheel, costs the same $599 with a 48 V 13 Ah pack. Our e-bike reviews hub sets reviews of other brands' bikes side by side, sorted by riding style, rider and price. The ten Samebikes we sell, from this $599 folder to the $1,599 STORM, are set side by side in our Samebike brand profile.

Before you buy: the checklist

Eight checks before you spend $599; the first three tell you whether the CY20 Pro fits your body and your route.

1. Measure your inseam and find your row in the saddle table.
2. Look up your state's e-bike definition and age line in our atlas, and the class wording on the paths you will ride.
3. Price your ride in the range tables and plan on 75% of the answer.
4. Measure your trunk or closet against the folded 34.6 × 19.3 × 33.5 inches.
5. Plan the lift: 68 lb for the bike, 81.5 lb for the box at delivery.
6. Add up rider and cargo and keep them within 330 lb.
7. Pick a charging spot for a pack that takes 6 to 8 hours from empty.
8. Check your insurance, as the manual advises.

Buying it from us

Why buy the CY20 Pro from Redtail

Our price is Samebike's own list price: $599 matched Samebike's US store in all three colors when we read both on September 26, 2026, and both showed $899 as the regular price. What we add begins when the order ships.

A change of mind is a separate matter: an unopened bike in its factory-sealed packaging, requested within 72 hours of delivery, carries a 15% restocking fee plus return shipping, and a canceled order a 3% transaction fee. That is why we would rather answer your fit and route questions before the order goes in.

Frequently asked questions

How far can the Samebike CY20 Pro go on one charge?

Samebike's figure is up to 90 km (56 miles). On our computation for a 180 lb rider on flat pavement, a full charge covers about 29 miles at 15 mph on the throttle, 23 at 18 mph, and 46 at 15 mph with easy pedaling; at 10 mph up a 4% grade on the throttle it covers 11. The range tables break it down.

What is the top speed of the Samebike CY20 Pro?

32 km/h, 19.9 mph, on Samebike's specification table and stat strip. For a 180 lb rider on level pavement, the range model's fastest steady throttle speed is 19.3 mph.

Is the CY20 Pro street legal, and what class is it?

Samebike assigns it no class, and your state's e-bike definition decides what it counts as where you ride. The figures those definitions test are Samebike's 500 W rating, its 800 W peak, its 32 km/h (19.9 mph) top speed and the thumb throttle; our 50-state atlas prints each state's definition, and the class section quotes the federal one.

How much does the Samebike CY20 Pro weigh?

31 kg, 68 lb, the figure Samebike publishes and the manual repeats. The box it ships in weighs 81.5 lb.

What is the CY20 Pro's weight limit?

150 kg, 330 lb, Samebike's load capacity. Keep yourself and your cargo inside it, and see the weight table for what each extra pound costs in range.

What size battery does the CY20 Pro have?

A removable 36 V 13 Ah pack, 468 watt-hours, in the seat tube. Samebike's range graphic prints 468 Wh too; the battery section takes it from there.

Can you replace the CY20 Pro's battery?

Yes: the manual removes it by flipping the saddle forward and turning a key, and Samebike's warranty policy covers the battery for 1 year, prorated after that. Email us with your order number and we will source a replacement pack that fits.

How long does the CY20 Pro take to charge?

Samebike gives 6 to 8 hours from empty. The charger in the manual outputs 2 A, and 13 Ah at 2 A is 6.5 hours by plain division, near the low end of that range.

How do you fold the Samebike CY20 Pro?

Fold the handlebar down, open the frame's folding buckle, and swing the front half back beside the rear wheel, the three steps in the manual. Folded, it measures 34.6 × 19.3 × 33.5 inches.

What tire pressure does the CY20 Pro use?

The pressure printed on the tire's sidewall; the manual says "According to the actual information on the tire". Samebike's page for the Spoked Wheel CY20 Pro, on the same 20 × 3.0 size, prints 40–65 psi, and the tire table shows what rolling resistance costs in range.

How much torque does the CY20 Pro have?

Samebike prints "55+Nm" in the page's subtitle and throttle panel. Our range model caps the motor at 50 N·m, the lower figure the page printed for this bike in August, so its hill figures lean cautious.

What's the difference between the CY20 and the CY20 Pro?

The CY20 Pro we sell has 20 × 3.0 tires, a 500 W hub and a 36 V 13 Ah (468 Wh) pack. Its Spoked Wheel twin has a 48 V 13 Ah (624 Wh) pack at the same $599; the plain CY20 Samebike sells in Europe is a different folder on 20 × 2.35 tires (Samebike's own comparison), so check the voltage and amp-hours on any figure you read.

What rider height fits the CY20 Pro?

Samebike prints 4'9" to 6'9" and 150–210 cm. On its drawn seat post, a 5'8" rider with the median 32.6-inch inseam needs a saddle 39.9 inches off the ground, inside the post's 35.7 to 41.8 inches, and the fit tables show 96 of 100 riders at 5'8" reached; at 6'0" it is 30 of 100.

Does the Samebike CY20 Pro have a throttle?

Yes, a thumb throttle for "full electric drive", in Samebike's words, beside five pedal-assist levels. The range tables show what the throttle and your pedaling each cost in miles.

Where do I find the CY20 Pro manual?

Samebike links the CY20 Pro user manual from its product page's FAQ. Its English section covers assembly, charging, folding, the display and the warranty.

Can I pay for the CY20 Pro in installments?

Yes, with Shop Pay on our listing: four interest-free installments, or a 12-month plan at $54.06 a month and 15% APR, $648.72 in total, on September 26, 2026, subject to an eligibility check by Affirm's lending partners.

Is Samebike a legit brand?

Look at the record for this bike: no CPSC recall or warning names Samebike as of September 26, 2026, the figures this review computes from are on Samebike's own US store, and its about page names the maker as Guangzhou Sameway Electric Bicycle Co., Ltd., founded in 2004. The verdict says who the CY20 Pro suits.

Limitations of this review

Eighteen things this review cannot settle, listed so you can weigh them.

1. We sell this bike. Read the red flags with the same attention as the green.
2. This is a specification-verified review. Its figures come from Samebike's published documents, statutes, our own store record, the published research the range and fit sections cite, or arithmetic on this page.
3. Each range figure is for a steady ride: one speed on one grade with no wind and no stops. Stops, starts and headwinds cost more, and a tailwind less.
4. Bafang's figures stand in for Samebike's motor. Samebike names no motor maker and publishes no no-load speed or efficiency, so the model keeps the published shape of Bafang's RM G0H0 at the CY20 Pro's 36 V and 500 W with a 21.7 mph no-load speed. At 82% efficiency in place of 80% the 15 mph throttle figure moves from 29 miles to 30; at a 750 W rating it barely moves on the flat.
5. No measured ride checks the whole model. The physics reproduces Martin and colleagues' worked example and the motor reproduces Bafang's 80% at the rated point, and the manual's 22-mile pure-electric figure matches a steady 18.5 mph throttle ride, but no ride to empty with its speed, load and weather stated was found for the CY20 Pro.
6. The torque cap is the lower of two figures. The page prints "55+Nm"; the model uses 50 N·m, which the same page's throttle panel printed on August 30, 2026, so hill figures lean cautious.
7. Every figure assumes the full 468 Wh. The documents read here do not say how much of the pack the battery management system releases; on one measured pedelec, researchers at KIT found 75% used in a standard range test, which is where the 25% reserve comes from.
8. The tire coefficient is borrowed from 26-inch fat tires. Bicycle Rolling Resistance's fat-bike table lists no 20-inch tire, so the model uses the median of ten 26 × 4.00 tires at 12 psi, bracketed in the tire table.
9. The cold figures rest on one cell's laboratory data. Samebike's page mentions LG cells without a model number, so the central line uses McMaster University's LG HG2 cell, bracketed by other published cell data, with the cells assumed to be at air temperature.
10. The fit figures rest on a measured drawing. The crank length, crank height, seat angle and grip position were measured on Samebike's size-and-fit photograph at the wheelbase scale; the rear tire draws larger than the front there, as a real photograph's perspective does.
11. The bodies are the US Army's. The 6,068 riders come from the 2012 ANSUR II survey, not a sample of the general public, so a body unlike the survey's at your height can sit differently on the same post.
12. The hand figure is a relaxed-back ceiling. It assumes the upper body hangs on the arms; a rider who holds the trunk up with the core puts less weight through the grip.
13. The saddle formula is a starting point. Knee angles at 109% of inseam still vary from rider to rider, so the heel check on delivery, and the 25-to-35-degree knee range it aims for, decides the final height.
14. Where Samebike prints two figures for one thing, this review plans on the more conservative one and names the other here. The pack: 36 V 13 Ah (468 Wh) in the specification table and the range graphic, "540Wh" in one paragraph. The top speed: 32 km/h in the table, 35 km/h in one gallery image. The suspension: "Front fork" in the table, "Dual Suspension Systems" on a feature panel. The water rating: IP54 in the manual, "IP64" in the page's FAQ. Email us and we will ask Samebike which applies to the bike you order.
15. The load capacity's basis is not stated. The documents read here do not say whether Samebike's 330 lb counts the bike's own 68; a load that stays within 262 lb of rider and cargo fits either reading.
16. The UL mark is read from photographs. Samebike's studio images show a TÜV SÜD mark reading "UL 2849", and neither the product page nor the manual prints a certificate number. Email us and we will ask Samebike for it in writing.
17. The recall search covers the CPSC's US database under the names listed; a recall filed under another company name would need that name searched.
18. Stock and price were read on September 26, 2026, and both can change.

The bottom line

For $599, the CY20 Pro puts a 500 W rear hub, a removable 468 Wh pack, a front fork, 20 × 3.0 tires, seven gears, a thumb throttle and five assist levels into a step-through frame that folds to 34.6 × 19.3 × 33.5 inches.

On level pavement a 180 lb rider gets about 29 miles at 15 mph on the throttle and 46 with easy pedaling. Samebike publishes 500 W and 19.9 mph for it and lists no class, so your state's definition decides where you ride it.

It suits city commutes, errands and trunk-and-closet storage for riders from about 5'2" to 5'10", where the drawn seat post fits most bodies. Through Shop Pay on our listing it comes to four interest-free installments, or $54.06 a month over 12 months at 15% APR, subject to an eligibility check.

Send us your height, your inseam and your route before you order, and we will answer with the numbers: where the saddle lands, how far your ride goes, and whether the paths you ride allow a throttle.

Source register

Each document this review relies on, and what it supports.

T1 is the record itself, read from the party that issued it: a statute, a federal regulation, the maker's own product page, record and manual, our own store record. T2 is a party's own publication about its product or its measurements: the motor maker's workbook, and the research groups' and laboratories' published measurements.

Expiry conditions

Re-read this page if Samebike changes the CY20 Pro's price, specification, range figures or size-and-fit drawing on its US product page; if Samebike answers our written questions on the certificate, the delivered speed and power settings or the load basis; or if the stock, the price or the Shop Pay terms change on our store.

Re-read it as well if Congress amends 15 U.S.C. § 2085, if Samebike publishes a class for the CY20 Pro, or if a recall or warning is published naming Samebike or Sameway. Verified September 26, 2026.

References

The full bibliographic record for each document cited above, with the date it was retrieved.

1. SAMEBIKE US, CY20 PRO Solid Wheel Portable Commuter Powerful Peak 800W Electric Bike — product page (stat strip, Size and fit, Specifications, feature panels, FAQs, as rendered). Retrieved September 26, 2026. https://us.samebike.com/products/cy20-pro-portable-commuter-powerful-500w-electric-bike
2. SAMEBIKE US, CY20 PRO — product record, variant prices, compare-at prices, SKUs, images and their dates. Retrieved September 26, 2026. https://us.samebike.com/products/cy20-pro-portable-commuter-powerful-500w-electric-bike.json
3. Guangzhou Sameway Electric Bicycle Co., Ltd., SAMEBIKE CY20 Pro user manual (English section: Important warning, Unpacking and specs, Charging Methods, Folding Steps, Display Instruction, Preparation before riding, Warranty policy). Retrieved September 26, 2026. https://cdn.shopify.com/s/files/1/0684/9173/9372/files/CY20_PRO_User_Manual.pdf?v=1774578907
4. SAMEBIKE US, Warranty Policy. Retrieved September 26, 2026. https://us.samebike.com/pages/warranty-policy
5. SAMEBIKE US, About Us. Retrieved September 26, 2026. https://us.samebike.com/pages/about-us
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7. SAMEBIKE US, CY20 PRO Spoked Wheel Portable Commuter Powerful Peak 800W Electric Bike — product page (stat strip, tire panel). Retrieved September 26, 2026. https://us.samebike.com/products/cy20-pro-spoked-wheel-portable-commuter-powerful-peak-800w-electric-bike
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