Samebike M20 Review 2026: A $999 Moped-Style E-Bike

One rear hub motor, 1200 W with an 1800 W peak · "100+Nm" · a removable 48 V 18 Ah battery, 864 Wh · hydraulic discs · a lockable fork and a coil rear shock · 20 × 4.0 tires · 50 km/h on the specification table · $999 · verified September 28, 2026

Quick Answer — The Samebike M20 is a $999 moped-style fat-tire e-bike with a 1200 W rear hub motor, 1800 W at peak, a removable 48 V 18 Ah battery holding 864 Wh, hydraulic disc brakes and suspension at both ends. On the throttle at 15 mph over level pavement, it carries a 180 lb rider a computed 47 miles.

Pedal lightly and this review's arithmetic stretches the same charge to 69 miles; Samebike's own longest figure is 140 km (87 miles) at pedal-assist level 1. The range section matches every figure to a ride you can plan, and the fit section shows at which heights riders sit flat-footed on its fixed bench.

What this review covers

What $999 buys · What it is · Fit · The motor · The battery · How far it goes · Brakes, lights and controls · Suspension, tires and basket · 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 M20 review

We read Samebike's figures on September 28, 2026 from its M20 product page, the product record, the M20 user manual linked from its Manuals and Guides page, and our listing. Range and fit are arithmetic on those inputs, with the sources and dates named in each section.

Every figure is checked against Samebike's published specification and recomputed, or cited where it stands: a specification-verified review. We sell the M20, so weigh its red flags as carefully as its green ones.

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

What $999 buys

Each row was read on September 28, 2026 from Samebike's product page (its title, specification table, stat strip, feature panels, size-and-fit drawing and list, gallery and FAQ) and from the manual's specification page. Where two of Samebike's documents differ, the table carries both, the range model plans on the figure its section names, and item 14 under Limitations lists the pairs together.

A moped-style e-bike with one motor and one pack

Picture a small motorcycle you can pedal: a long bench, a SAMEBIKE-branded battery shaped like a fuel tank over the top tube, a caged round headlight, a wire basket where an engine would sit, and one hub motor turning the back wheel. Samebike's US store sells it as the "M20 Off Road Peak 1800W Fat Tire Electric Bike", and its FAQ describes it as "a model between electric bicycles and electric dirt bikes".

The Peru M20 in Samebike's studio: one pack on the top tube, a basket in the frame, and a motor in the rear hub only.

More than one Samebike carries the M20 name, so check which bike a figure belongs to. The M20-III adds a second motor and a second battery, and search engines still index an "M20-II 1500W Street Electric Bicycle" on Samebike's US store at an address that answered HTTP 404 on September 28, 2026.

That day the store's older M20 address, "m20-1200w-electric-bike", redirected (HTTP 301) to the page this review reads. Its figures describe the bike our listing matches: 1200 W, an 1800 W peak, and one 48 V 18 Ah pack, which multiplies to 864 watt-hours. The chainstay decal reads "Pilot", and gallery image 17 titles its size chart "SAMEBIKE M20 Pilot".

Gallery image 5 on Samebike's M20 page: a black M20 on a forest track. Peru is the color on our listing.

Will the M20 fit you?

The bench is fixed, so the M20 fits by where your feet land: sitting on it, 72 of every 100 riders at 5'8" rest both feet flat on the ground, 30 at 5'6" and 5 at 5'4". From 5'10" up, the share is 96 of 100 or higher.

Those shares take the bench's top where Samebike's drawing starts its G line, 32.2 inches above the ground. Samebike lists the seat at 32.5 inches, between that point and the bench's raised rear end, and at 32.5 the 5'8" share falls to 56 of 100; the stop table prints both, with the 32.4 inches on gallery image 17 beside them.

Every share places the 6,068 bodies of the US Army's 2012 survey on Samebike's drawing. Three steps compare the bike with your own body:

1. Measure your inseam barefoot: stand with your back to a wall, draw a hardcover book up between your legs as a saddle would sit, and read the height of its top edge.
2. Look up your height in the stop table and check that your inseam sits inside that row's typical range.
3. Decide how much pedaling you will do: on the throttle, the bench's height hardly matters; for long pedaled miles, the bench table shows how far under a pedaling height you will sit.

Samebike puts the M20's rider window at 5'6" to 7'2", on its size-and-fit drawing and again on gallery image 17. The tables below measure riders of each height against the bike in that drawing, with Samebike's own figures alongside:

Samebike's M20 drawing at its published 43.3-inch wheelbase. Six of seven checks against Samebike's listed dimensions come within 2.2 percent on it, and the total height reads 3.6 percent over.

Does the bench put your legs in a pedaling position?

Rarely: the bench lands at the pedaling formula's height for 2 of every 100 riders at 5'0", and for none from 5'2" up, because a bench has no post to raise.

The formula sets the saddle top 109% of inseam above the pedal axle, the height whose knee angles Peveler et al., 2005 measured, and the riders in Ferrer-Roca et al., 2012 support settings as low as 106%. On Samebike's drawing the crank axle stands 11.6 inches off the ground, each crank measures about 168 mm, and the G line leaves the bench 7.4 inches behind the crank axle.

Riders per 100 at each height whose inseam puts the bench's 32.2 inches inside the 106–110.4% band the saddle studies support, and the median rider's formula height above the ground; the Army survey's men and women together. An inseam near 26.2 inches puts the bench exactly at 109%.

What the gap does to your pedaling: the formula height goes with a knee bend of 25 to 35 degrees at the bottom of the stroke (Peveler et al., 2007), and a lower seat keeps the knee more bent than that.

At 5'8" the bench sits 6.6 inches below the median rider's formula height, a knees-up, moped-like posture that works with the throttle and with pedaling at an easy effort.

Planning long pedaled rides instead? The RS-A08 II carries a seat post that reaches the formula height for 85 of 100 riders at 5'8".

Can I put my feet down at a stop?

From about 5'8" up, most riders can: seated on the bench at 32.2 inches, 72 of every 100 riders at 5'8" reach the ground flat-footed, and 96 at 5'10". At 5'6" the share is 30 of 100, and at 5'4", 5.

On the M20 the bench serves as both seat and frame, so stopping comes down to one question: sitting on it, do both feet reach the ground? Samebike's 32.5 inches sits 0.3 inch above the bench top where its drawing starts the G line, and gallery image 17 prints 32.4.

Riders of 100 at each height whose barefoot inseam reaches the seat height, so both feet rest flat while seated; the inseam column shows the median rider, and shoes add to every figure. Short of flat-footed, a rider can still stop on tiptoe or slide forward off the bench.

Under about 5'8" and wanting both feet flat at every stop? The RS-A02 Plus pairs a 1200 W rear hub and 1800 W peak, as on the M20, with hydraulic brakes and an 816 Wh pack, on a frame whose lowest top edge 95 of 100 riders at 5'0" clear.

Will I feel cramped, or stretched?

Neither, for most riders: at the drawn bar the median rider leans 12 degrees from upright at 5'0" and 4 at 5'8", and from 6'2" up sits straight. On Samebike's drawing the grips stand 31.2 to 34.2 inches above the crank axle and 15.3 to 18.0 inches in front of it.

When twenty recreational cyclists tried three trunk angles, they rated the most upright one the most comfortable (Priego Quesada et al., 2017). Each lean in the table is the least forward tilt that lets a straight arm reach the grip from the sit bones, computed from the torso and arm lengths of every surveyed body.

The median rider's lean with the bar as Samebike draws it; the spread covers sitting anywhere on the bench's seated part and holding any point of the grip, and its low end is a rider with the back vertical.

The bench leaves room to shift, from about 5 inches ahead of the point the G line starts from to about 8 inches behind it; the tables use that point.

How much weight goes through my wrists?

Not much: with the back relaxed, the median rider puts 5 to 12 percent of body weight on the grips, 5 to 7 pounds per hand. Ten road racers on their brake hoods in a laboratory, by contrast, loaded the bars with 15% of their weight (Carahalios, 2015).

In the 36 riders Slane et al., 2011 measured, pressure over the ulnar nerve's path through the palm rose highest in the most stretched-out position, which is why a tall bar like the M20's spares the wrists.

An upper bound, back relaxed and bar as drawn, built from each body's segment weights (Clauser et al., 1969) and the survey's median weight at each height; the bracket runs across every seat position and every point of the grip.

How do I set it up when it arrives?

Fit the handlebar, the headlight, the front fender, the front wheel and the pedals, connect the power plug, then run the brake check; the bench needs no adjusting. The M20 manual pictures each step: undo the stem's four screws, set the handlebar at the angle you like, and tighten the four screws again.

The headlight buckles onto the fork and screws down on both sides, and the front wheel drops in with its disc toward the brake, held by a quick-release skewer you tighten and then lock. The pedals carry L and R marks: the left one threads in counterclockwise and the right one clockwise.

The bench in Samebike's photograph, here on a black M20 (the Peru bike's is brown): long and flat enough to change position on.

The power plug sits beside the rear shock: turn it until the arrows line up, push it home and screw its nut on clockwise, per the manual's step 4.6. The box holds two large wrenches, four hex keys, a screwdriver and the charger.

Before the first ride the manual asks you to check the brakes, wheels, handlebar and quick release and to charge a low battery, and to stop and contact customer service if the brakes do not work properly; on an order from us, that contact is an email to us.

How we computed fit

Four calculations run this section: the formula saddle top, 1.09 × inseam above the pedal axle, set against the fixed bench; seated flat-footing, barefoot inseam against the seat height; lean, the least trunk angle that lets a straight arm reach the grip; and hand load, the upper body's weight against where the grips stand.

Take a 5'8" rider with the median 32.6-inch inseam: the formula asks for 35.6 inches from the pedal, or 29.0 from the crank axle along the line to the bench (88.3% of inseam gives 28.8), which places the formula height 38.8 inches off the ground, 6.6 inches over the bench's 32.2.

The drawing had to reproduce Samebike's own dimensions before any measurement was taken from it:

The scale is Samebike's published 43.3-inch wheelbase (1099.8 mm), between axle centers found by fitting a circle to the lower arc of each tire; the crank axle is the center of a circle fitted to the chainring's outer edge. Samebike labels its F line "Tire width" and draws it across the whole wheel through the hub, which is why its 22.8 inches reads as the wheel's diameter.

One motor in the rear wheel: 1200 W, 1800 W at peak, 100+ N·m

Samebike's specification table rates the M20's motor at 1200 W with an 1800 W peak, the peak in its product title and on the stat strip. The motor panel sums the drive up in one line: "Equipped with a 1800W peak motor and Shimano 7S gearing system, our electric motorcycle handles both bustling city streets and quiet outdoor roads with ease."

The stat block beside that paragraph reads "100+Nm Torque", and gallery image 18 repeats it as "100+ N.M Torque" under the words "Peak 1800W Powerful High Speed Brushless Hub-Motor".

The rear hub motor in Samebike's photograph, carrying the Shimano freewheel beside the Tourney derailleur.

The M20 manual numbers one motor on its components page, part 13, at the rear hub. The front wheel has none: step 4.4 fits it on a quick-release skewer, and Samebike's front-wheel photograph shows a plain hub behind the rotor.

The front wheel in Samebike's photograph: a rotor and a plain hub, with the fork leg beside it.

The range model runs the M20 on one 1200 W motor capped at 100 N·m, the low end of Samebike's "100+Nm".

Press the thumb lever or turn the pedals: the throttle drives the bike by itself, and five assist levels add motor power as you pedal. The manual numbers the levels 0 to 5, where 0 switches the motor's output off, 1 is the gentlest and 5 the strongest, and the display starts every ride at level 1.

Your gear choice changes your cadence, not the battery's work. The rear hub spins with the wheel in each of the seven Shimano gears, so shifting changes how fast your legs turn, and the battery sees only the watts you contribute; the gear table puts numbers on them.

One battery: 864 Wh from 48 V and 18 Ah

A 48 V pack of 18 Ah holds 864 watt-hours, and every range figure in this review is divided out of that number. Samebike's description names "the removable 48V 18AH battery", and its battery panel promises that "a single charge can provide a 60km pure electric range or a 90km assisted range".

The M20 manual numbers the tank-shaped pack as part 7 and removes it in three steps: shut down the power, turn the key clockwise to unlock it and push the pack forward, then lift it off. You can charge it on the bike through the charging hole or remove it to charge, and the charger's light shows red while charging and green once full.

Samebike's illustration of the tank battery, its cells drawn glowing through the shell; an illustration, not a photograph.

The charger in the manual is rated 54.6 V and 3 A, so the 18 Ah pack needs 6.0 hours by simple division. Samebike's specification table and gallery image 16 give 4–6 hours and the manual 4–8, so charge overnight.

Divided into the 864 Wh, each of Samebike's range figures shows the watt-hours per mile it assumes:

864 Wh divided by each distance; the range section finds the steady ride that matches each one. Beside its kilometers, the manual prints 50–62 miles for pedal assist and 25–28 miles for pure electric.

How far the M20 goes on one charge

On a full pack a 180 lb rider covers about 47 miles of level pavement at 15 mph on the throttle, 34 at 20 mph, and 69 at 15 mph with easy pedaling. Hold a steady 4% climb at 10 mph on the throttle and the same charge lasts about 16 miles.

Work out your own ride in three steps:

1. Pick your cruising speed and pedaling effort in the first two tables.
2. Add 184 to 256 Wh for each 1,000 feet of climbing, the throttle's price at 10 mph in the hill table.
3. Correct for your weight and the temperature, then plan on 75% of the result.

Every number comes from one steady-state calculation built on Samebike's own specifications, the published curve of a comparable Bafang hub motor, ten fat tires measured on a drum, and a cycling-power model checked against riders on an open road. The formula subsection takes one mile through it by hand.

Does riding faster cut range? Miles at each speed

On the flat, speed sets most of your range: a pack that lasts 63 miles at 10 mph on the throttle covers 34 at 20 mph, because the power spent against the air rises with the cube of speed.

On the throttle alone over level pavement at 77 °F, with a 180 lb rider on a bike of 127.9 lb, the specification table's weight. The last column leaves a quarter of the pack unused, the share one pedelec held back in a standard laboratory range test (Schmitt, Decker and Doppelbauer, 2019).

Nothing else in these tables adds as many miles as your legs: 75 W of pedaling at 15 mph raises a full charge from 47 miles to 69. Easy here means 75 W and steady means 150 W; with the motor off, those efforts would move this bike across level ground at about 8.3 and 12.5 mph, a quick check on which column is yours.

Miles from a full pack on level pavement with 180 lb aboard. At 15 mph, easy pedaling takes 12.5 Wh a mile from the pack against 18.6 on the throttle alone. The 127-mile cell leans hardest on your own output and on the motor's losses at light load, the model's least certain input (Limitations item 4).

The assist level sets how readily the motor joins in; how far you go follows the speed you hold and the watts you add, so choose the row that matches your riding.

Which gear saves battery? On hub motors, your effort does

Shift for your knees; the pack answers to your effort. The rear hub turns with the wheel in every gear, so the draw moves only with the watts you put in:

Watt-hours per mile taken from the battery, 180 lb rider.

The low gears pay off on hills: holding 150 W at 12 mph up a 4% grade cuts the pack's share from 53.2 Wh a mile to 32.6, and the easiest cog is what lets your legs keep that effort up.

Does going uphill drain the battery faster?

Yes: at 10 mph on the throttle, each 1,000 feet gained on a 4 to 10% grade costs 184 to 256 Wh more than the same miles on the flat. Raising 307.9 lb of rider and bike through 1,000 feet takes about 116 Wh at the wheel; the motor's and the pack's losses make up the rest.

Every row at 10 mph and 180 lb: the throttle alone in the middle columns, with 75 W of easy pedaling added in the last. Samebike's M20 manual gives 25 degrees as its "Max Angle of Climb".

Price a hilly route in two parts, the flat miles and the climbing, then add them. Ten flat miles at 15 mph on the throttle use about 186 Wh, and 500 feet of 6% grade adds about 102, near 288 of the 864. The model holds one steady speed on every mile, so stops and headwinds come on top.

Does rider weight affect range?

A little on the flat, a great deal on a climb. Extra pounds load the tires and the grade while the air's share stays the same, so weight matters more as the road tilts up.

Rider plus cargo, carried on a bike of 127.9 lb, on the throttle alone. The last row is the 330 lb load capacity on Samebike's drawing, on gallery image 17 and in the manual.

Going from 180 lb to 330 lb takes the level 15 mph ride from 47 miles to 38, and the 8% climb at 10 mph from 8 miles to 4.

Does cold weather drain the battery?

Yes: at 32 °F the 15 mph throttle ride shrinks from 47 miles to about 37, and at 14 °F to about 33.

Level pavement, 180 lb rider, throttle only. The central line interpolates McMaster University's LG HG2 cell measurements at 0.5C discharge (77, 50, 32 and 14 °F) with the cells at air temperature; the brackets hold the range other published cell tests give, wider below freezing (Limitations item 9).

Three things change at once in the cold. At 32 °F the pack holds about 89% of its 77 °F energy, and the air is roughly 9% denser, following the gas law behind the U.S. Standard Atmosphere.

The rubber stiffens too: the model raises rolling resistance by about 0.9% per degree Celsius of cooling, between the rate Rothhämel fitted for a 42 mm tire and the road-tire average in Bicycle Rolling Resistance's temperature test, and holds it flat below 41 °F.

Do the tires cut range? Tires and riding position

The tire alone moves a 15 mph flat ride across a 12-mile spread: 43 miles on the hardest-rolling of ten fat tires, 55 on the easiest. Bicycle Rolling Resistance ran ten 26 × 4.00 fat tires on its drum at 12 psi and 18 mph with 94 lb on the wheel, reading 23.2 to 42.1 W, and the model takes their median.

Miles from a full pack for a 180 lb rider riding the throttle on level pavement. Of the ten, Kenda's Juggernaut Pro took the most power on the drum and Schwalbe's Jumbo Jim LiteSkin the least. Samebike's gallery shows the M20 on 20-inch Chao Yang tires, and the manual's photographs on INNOVA tires, sizes the drum's 26-inch set leaves out (Limitations item 8).

For pressure, the manual points you to the tire itself: "According to the actual information on the tire." The same manual names low tire pressure among the habits that shorten range and asks for a pressure check before each ride.

Posture matters more as speed rises. Roadside measurements by Tengattini and Bigazzi gave 37 upright cruiser riders a drag area of 0.640 m², the figure used here, and 90 everyday mountain-bike riders 0.603 m²; sitting like the second group adds about a mile and a half at 20 mph (33.6 to 35.0 miles before rounding).

Samebike's 140 km and 70 km, turned into rides

Samebike prints ten range figures for the M20 across its page and manual, and each one describes a different steady ride. Its battery panel ties the "140KM Pas 1 Mode Range" to assist level 1.

• 140 km (87 miles), the specification table's "Max range" and the battery panel's level-1 figure, allows 9.9 Wh a mile: easy pedaling at about 13.4 mph, or steady pedaling near 16.7.
• 120 and 100 km (75 and 62 miles), the manual's pedal-assist band, and the 62 miles on gallery image 16, allow 11.6 to 13.9 Wh a mile: easy pedaling at about 14.5 to 16.0 mph.
• 90 km (56 miles), the battery panel's assisted figure, allows 15.4 Wh a mile, easy pedaling near 16.9 mph.
• 70 km (43 miles), the pure-electric figure on the specification table and stat strip, allows 19.9 Wh a mile, a steady 16.1 mph on the throttle alone; the 45 miles on gallery image 16 matches the throttle at 15.6 mph.
• 65 km (40 miles), the FAQ's "Up to 65 km+ on PAS mode", allows 21.4 Wh a mile: easy pedaling near 20.3 mph, or 17.2 mph on the throttle alone.
• 60 and 50 km (37 and 31 miles), the pure-electric figures on the battery panel and in the manual, allow 23.2 to 27.8 Wh a mile, about 18.5 to 21.2 mph on the throttle alone.

Samebike's longest figures assume gentle pedaling, and its shortest a throttle ride between about 16 and 21 mph.

Plan on three-quarters of any full-charge figure. One pedelec in a standard laboratory range test released 75% of its rated energy and kept the rest back to protect its cells (Schmitt, Decker and Doppelbauer, 2019); on that basis the 47-mile throttle ride at 15 mph becomes a 35-mile plan.

How every figure here is worked out

A steady speed calls for steady power at the rear wheel. Martin and colleagues (1998) wrote that power, in still air, as one equation and showed it matching what riders produced on an open road:

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

P is the power at the rear wheel and v the speed; m is the combined mass of rider, cargo and bike, g gravity and θ the slope; Crr is the tires' rolling resistance, where 0.0105 means a drag of 1.05% of the load they carry; ρ is air density; and CdA is the drag area, the size of the hole the rider opens in the air.

Four steps carry the wheel's power back to the battery:

1. Your pedaling passes through a chain Martin and colleagues measured at 97.7% efficiency, and the motor makes up the rest.
2. The motor takes its shape from a comparable motor's published data: Bafang's 2021 OEM workbook lists its RM G0H0 geared hub at 510 rpm unloaded and 426 rpm at the rated point, at no less than 80% efficiency. The model scales that shape to the M20's 48 V and 1200 W, sets the unloaded speed at 31.1 mph from Samebike's 50 km/h, and caps torque at 100 N·m.
3. The battery loses a few percent as heat inside its cells, the loss Arango, Lopez and Ceren measured on a 48 V e-bike pack.
4. Watt-hours per mile is the battery's output in watts divided by the speed in mph, and the miles are the 864 Wh, adjusted for temperature, divided by that.

A mile worked through by hand, on the throttle at 15 mph over level pavement with 180 lb aboard. Rolling takes 96.79 W and the air 114.23 W, 211.02 W together at the wheel.

At that speed the 22.8-inch wheel turns 221 rpm. Built from Bafang's published figures at 48 V and 1200 W, the motor model has a torque constant of 1.001 N·m per amp, 0.253 Ω of winding resistance and a 1.32 A no-load current; the 9.11 N·m the wheel needs draws 10.43 A, and the motor runs at 78% efficiency.

Once the pack's own losses are counted the cells supply 278.4 W, or 18.56 Wh a mile at 15 mph: 864 ÷ 18.56 is 46.6 miles, and 34.9 with a quarter held back.

The checks behind the model. Every link in the chain reproduces a figure its own source printed:

Three benchmarks, one per link: Martin and colleagues' Appendix I example for the road physics (8.36 m/s, a 90 kg system on a 0.3% grade), Bafang's rated point for the comparable RM G0H0 motor, and the pure-electric 70 km on Samebike's product page for the whole chain, which the model meets at a steady 16.1 mph.

No source read for this review records an M20 ridden until the pack ran out with its speed and load stated; Limitations item 5 says what that leaves open.

Brakes, lights and controls

Hydraulic disc brakes front and rear. The specification table lists "Hydraulic disc brakes", and Samebike's brake panel says hydraulic brakes "provide a better braking effect in any condition, ride rain or shine".

Samebike's brake image, two photographs joined on a diagonal: the lever at the bar and the caliper on the front rotor.

For an emergency stop at speed, the manual says to brake the rear wheel first and then the front, since a sudden front brake can tip the bike over.

The left grip in Samebike's photograph: the control pad, the thumb lever and the horn button.

Samebike's gallery image 15 labels the left grip's lever "Thumb Throttle", while two of the product page's feature panels carry the titles "Thumb Turn" ("One thumb controls the entire bicycle") and "Half Twist Throttle" ("It is safer than full twist, protecting you from accidental engagement"). The photographs show the thumb lever, so ask us if the throttle type decides your order.

The right grip: the brake lever and the Shimano shifter with its gear window.

A headlight, a tail light, a horn and a USB port come fitted. The manual lists an "Electric Horn Installed" and a 5 V 1 A USB port, which gallery image 15 places under the control pad; Samebike's headlight panel promises "a large headlight", and its lighting photograph shows the tail light glowing red under the bench.

Both lights on in Samebike's photograph: the caged headlight at the front and the tail light under the bench.

The display shows current, maximum and average speed, trip and total mileage, the battery level and the assist level, and an error code when the electrical system faults. A short press of the headlight key switches the lights on and dims the screen; holding the minus key for 2 seconds starts push assist at under 6 km/h, for walking beside the bike; and the display turns itself off after 10 idle minutes, per the manual.

A lockable fork, a coil rear shock, 20 × 4.0 tires and a basket

Suspension front and rear. The specification table lists "Adjustable front fork+rear suspension", Samebike's shock panel promises "Full suspension with Shock Absorber Seat", and its fork panel says to "unlock it for bumpy roads to absorb shocks, lock it on flat surfaces for a stable ride".

The fork's upper crown in Samebike's photograph, the red COMPRESSION knob on one fork leg.

Gallery image 15 labels the fork "suspension fork with lock", and its red knob reads COMPRESSION. At the back, Samebike's side-view photographs show a coil-over shock between the frame and the swing arm, under the bench.

The tires are 20 × 4.0 on the specification table, with Chao Yang on the tan sidewalls in Samebike's gallery and INNOVA in the manual's photographs; the tire panel says "Whether it's snow, beach, road, or flat mud, The wide tire design ensures stable riding in any terrain." The tire table prices the tires in miles.

The basket in Samebike's photograph, fitted into the frame where an engine would sit.

The basket is part of the frame. Samebike's "Loading Space" panel calls it a "Mid-Mounted Shopping cart" that "helps you carry groceries, gear and more when you're out on the roads or trails", and it sits low in the frame, between the wheels.

Five weights, two load figures: what to plan around

Samebike prints five weights for the M20: 58 kg (127.9 lb) on its specification table, 50 kg (110.2 lb) for the bike and 58 kg (127.8 lb) packaged in the manual, 94.7 lb on the size-and-fit drawing, and 70.5 lb on gallery image 17.

The table's 58 kg equals the manual's figure for the packed bike. The range figures here use 127.9 lb, the heaviest, so they lean toward fewer miles; before you plan stairs or a car rack around the bike, email us and we will get the delivered weight from Samebike in writing.

The load rating is 330 lb (150 kg) on the drawing, gallery image 17 and the manual, while the specification table and stat strip print a 180 kg (396.8 lb) "Payload". Plan on 330: should that figure include the bike, rider plus cargo of up to 202.1 lb fits at the table's weight and up to 219.8 lb at the manual's 110.2; closer than that, we will ask Samebike first.

The carton measures 1410 × 320 × 920 mm (55.5 × 12.6 × 36.2 inches) and weighs 127.8 lb (58 kg), per the manual, a lift for two people at the curb. The frame does not fold ("Foldable: No" on the specification table), and the size-and-fit list gives it 68.9 inches of length and 44.3 of height.

The Mercer fit test

The Mercers are seven archetype riders who stand in for our buyers in every review (meet the Mercers). Each verdict below reads Samebike's published height window, bench height and load rating through the fit tables built on its drawing.

Ruth, Dana and Maya show how much the bench height matters under 5'8", and Jack shows what a fixed bench means for long pedaling. At 5'6", Maya's share of flat-footed stops moves from 30 of 100 at the drawing's 32.2 inches to 20 at the listed 32.5, so her barefoot inseam against 32.5 decides it before she orders.

The Peru M20 from the front three-quarter, the color on our listing at $999.

Is it UL certified?

The M20 manual closes with two marks: "EPAC EN 15194" and CE. UL 2849, the standard UL Solutions certifies e-bikes to, is a separate test of the electrical drive train, battery and charger working together.

Samebike's US M20 page, its product record and the manual name no UL 2849 certificate. If a landlord, building manager or insurer asks for one, tell us before the bike ships and we will request it from Samebike.

Has it been recalled?

No. On September 28, 2026, searches of the CPSC's recall database for Samebike, Same bike, Samebikes, Sameway and Guangzhou Sameway, across recall titles, product names and manufacturers, came back empty, while known recalls from three other brands returned as controls. The 623 bicycle, e-bike, battery and scooter recalls saved on September 25 include none that names an M20.

The CPSC's site search, which also carries its consumer warnings, answered "No Results." for Samebike and for Sameway that day, while a brand with warnings on file returned them.

The class question for a 1200 W throttle bike

Samebike's US page gives the M20 no class, so your state's definition is the one that counts. State definitions weigh what Samebike publishes: a 1200 W motor with an 1800 W peak, 50 km/h (31.1 mph) on the specification table, stat strip and motor panel, and a thumb throttle that moves the bike with no pedaling.

At the federal level, 15 U.S.C. § 2085 places low-speed electric bicycles under the CPSC's bicycle rules, and subsection (b) defines the term 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."

Read September 28, 2026: 15 U.S.C. § 2085, Samebike's product page and the M20 manual.

Where your state's wording turns on watts or top speed, email us before you order. Samebike's documents print two top speeds for the M20, 50 km/h on the specification table and 25 km/h in the manual, and we will get the delivered bike's power and speed from Samebike in writing before you count on either.

The manual adds a practical step: ask your insurer or broker whether your policy covers e-bike riding. Each state's own definition is collected in our 50-state e-bike law atlas.

Where you can ride it

Trails signed for class 1 e-bikes only are off-limits to the M20. The federal class 1 definition requires a motor that "provides assistance only when the rider is pedaling" (43 CFR 8340.0-5(j)(1)), and the M20 has a throttle. Beyond that, the owner of the ground sets the rule.

On Bureau of Land Management land, 43 CFR 8340.0-5 sets out three e-bike classes around a motor "of not more than 750 watts (1 h.p.)" and leaves each area's access to a written decision by the authorized officer.

Four kinds of ground and four rulebooks, and the specification sheet decides none of them.

On National Forest trails the motor vehicle use map governs: a trail the map closes to motor vehicles is closed to the M20, and breaking that rule carries a federal penalty.

36 CFR 261.2 defines a motor vehicle as "any vehicle which is self-propelled", and 36 CFR 261.1b sets the penalty for breaking a Part 261 rule at "imprisonment of not more than six months", a fine under 18 U.S.C. 3571, or both. Get the district's map before you set out.

Gallery image 19 on Samebike's M20 page: a rider standing over a DarkGreen M20 on a bridge above a lake.

Samebike's FAQ says the M20 "is more suitable for the off-road experience than ordinary electric bikes"; our public-land guide sets out each federal land agency's e-bike rules.

Green flags / Red flags

Green flags

• $999 on our listing, matching Samebike's US store on September 28, 2026, which shows $1,499 as the regular price.
• A 1200 W rear hub with an 1800 W peak on the specification table and "100+Nm" on the motor panel.
• 864 Wh in one removable pack: about 69 computed miles at 15 mph with easy pedaling for a 180 lb rider.
• Hydraulic disc brakes front and rear, named on the specification table and the brake panel.
• A lockable fork and a coil-over rear shock on 20 × 4.0 tires, with a COMPRESSION knob on the fork.
• A basket built into the frame, which Samebike calls a "Mid-Mounted Shopping cart".
• An upright seat: from 5'10" up the median rider leans 3 degrees or less, with 5 to 12 percent of body weight on the hands at any height.
• Free delivery, and damage claims we file: shipping costs nothing in the contiguous United States, and transit damage reported within 48 hours becomes a carrier claim we handle.
• About 16 cents to fill the pack, at July 2026's average US household electricity rate.

Red flags

Each red flag below is about fit, and each names the page or bike to read instead.

• Wrong if you stand under about 5'8" and need both feet flat when you stop. Seated on the bench, 30 of 100 riders at 5'6" reach the ground flat-footed and 5 of 100 at 5'4"; the RS-A02 Plus keeps a 1200 W rear hub and hydraulic brakes on a frame 95 of 100 riders at 5'0" can stand over.
• Wrong if you plan long pedaled rides with your legs near full extension. From 5'2" up, no rider's formula height is as low as the fixed bench; the RS-A08 II's seat post reaches that height for 85 of 100 riders at 5'8".
• Wrong if it has to fold to fit a car trunk or a closet. The specification table says "Foldable: No"; the RS-A02 Plus folds and carries an 816 Wh pack, for $1,199.
• Wrong if one pack will not cover your ride. The M20-III adds a second motor and a second 48 V 18 Ah pack, 1,728 Wh in all, for $1,499.
• Wrong for trails signed class 1 only. A class 1 sign keeps throttle bikes off; our public-land guide covers each federal agency's rule, and we will read your trail's sign with you.
• Wrong for a rider below your state's minimum riding age. Look up the minimum in our 50-state atlas, then tell us the rider's age and we will suggest a bike we sell that meets it.

Buy it if / Buy something else if

Buy it if you want a moped-style fat-tire bike with a 1200 W motor, a frame basket and hydraulic brakes, for throttle riding and easy pedaling; you stand about 5'8" or taller, where the stop table has most riders flat-footed on the bench; and it can stay full-length in a garage or on a rack.

For $999 the M20 brings a 1200 W rear hub with an 1800 W peak and "100+Nm" on the specification table and motor panel, an 864 Wh removable pack, hydraulic disc brakes, a lockable fork and a coil-over rear shock, 20 × 4.0 tires, seven Shimano gears, a thumb throttle, five assist levels, a headlight, a horn and a basket.

Paying over time? On our listing, Shop Pay showed four interest-free installments on September 28, 2026, with sample plans of $333.00 every two weeks for six weeks at 0% APR, $999 in total, or $90.17 a month for 12 months at 15% APR, $1,082.04 in total, each after an eligibility check.

Buy something else if you are under about 5'8" and need flat-footed stops, where the RS-A02 Plus keeps the same motor rating on a lower frame; if you will pedal long distances, where the RS-A08 II has a seat post that rises to a pedaling height; if it must fold, where the RS-A02 Plus does; or if one pack is too few, where the M20-III carries two.

The same range and fit models run through our reviews of the M20-III, the RS-A08 II, the RS-A02 Plus, the RS-A02 Pro, the LO26 Plus, the CY20 Pro, the STORM and the CREST. For the whole range, our Samebike brand profile compares the ten models we stock, and our e-bike reviews hub sorts other makers' bikes by style, rider and price.

Before you buy: the checklist

Go through these eight before you spend $999; the first three tell you whether the M20 suits your body and your roads.

1. Bring your barefoot inseam to the stop table and the bench table, in your height's row.
2. Look up your state's e-bike definition and minimum age in our atlas, and read the class signs on the paths you plan to use.
3. Size your usual ride in watt-hours with the range tables, keeping a quarter of the 864 in reserve.
4. Measure the garage, hallway or rack against 68.9 inches of length and 44.3 of height, since the frame does not fold.
5. Plan delivery for two people: the carton weighs 127.8 lb.
6. Keep rider and cargo together under 330 lb; if you are close, email us.
7. Set up a charging spot where the pack can sit overnight, on the bike or indoors.
8. Call your insurer about e-bike cover, a step the M20 manual recommends.

Buying it from us

Why buy the M20 from Redtail

The Peru M20 costs $999 on our listing, the same price Samebike's US store listed on September 28, 2026, and the table sets out what buying it from us adds.

Changed your mind after delivery? Under our refund policy the box has to stay unopened and factory-sealed and the request has to reach us within 72 hours, with a 15% restocking fee and return shipping charged; canceling an order costs 3%. Fit and route questions cost nothing, so ask them first.

Frequently asked questions

How far can the Samebike M20 go on one charge?

About 47 miles at 15 mph on the throttle for a 180 lb rider on level pavement, computed from a full pack; easy pedaling stretches it to about 69, and 20 mph on the throttle gives about 34. Hold a 4% climb at 10 mph and it falls to about 16. Samebike's own longest figure is 140 km (87 miles) at pedal-assist level 1, and the range tables adjust each figure for weight, climbing and temperature.

What is the top speed of the Samebike M20?

50 km/h (31.1 mph) on Samebike's specification table, stat strip and motor panel; the manual's specification page prints 25 km/h. Where your state's rules turn on top speed, ask us and we will request Samebike's written figure for the unit you would receive.

What's the difference between the M20 and the M20-III?

The M20-III adds a second motor and a second pack: two 1000 W hub motors (3000 W peak on its table) and 1,728 Wh, against the M20's one 1200 W rear motor (1800 W peak) and 864 Wh. Ours sell at $999 and $1,499, both carry "Pilot" on their frame decals, and our M20-III review runs the same models on the two-motor bike.

Is the M20 street legal, and what class is it?

Your state decides, because Samebike gives the M20 no class. State definitions weigh motor power, top speed and whether a throttle works without pedaling; for this bike those are 1200 W with an 1800 W peak, 50 km/h on the specification table, and yes. Find your state's wording in our 50-state atlas; the class section quotes the federal definition word for word.

How much does the Samebike M20 weigh?

Samebike prints five figures: 127.9 lb (58 kg) on its specification table, 110.2 lb (50 kg) for the bike and 127.8 lb packaged in the manual, 94.7 lb on its size-and-fit drawing and 70.5 lb on gallery image 17. Plan your lifting on the heaviest until we confirm the delivered bike's weight with Samebike.

What is the M20's weight limit?

330 lb (150 kg) on Samebike's size-and-fit drawing, on gallery image 17 and in the manual; the specification table prints a 180 kg (396.8 lb) "Payload". With 202.1 lb or less of rider and cargo you stay inside 330 even if Samebike counts the bike at its heaviest listed weight; nearer the line, email us and we will get Samebike's answer.

How much torque does the M20 have?

"100+Nm", on Samebike's motor panel and on gallery image 18, which calls the motor a "Brushless Hub-Motor". The range model caps it at 100 N·m, the low end of that figure.

What battery does the M20 use?

One 48 V 18 Ah pack, 864 Wh by Samebike's specification table, shaped like a fuel tank and mounted above the top tube. The battery section converts each of Samebike's range figures into watt-hours per mile, and the range tables convert the pack into miles at your speed, weight and climbing.

Can you replace the M20's battery?

It comes off with its key: switch the power off, turn the key clockwise, push the pack forward and lift it away (the manual). Samebike's warranty policy repairs or replaces a battery that fails in its first year at no cost, and after the first year gives a prorated credit, based on months of service, toward a new one; for a spare, email us your order number and we will find the match.

How long does the M20 take to charge?

4 to 6 hours on Samebike's specification table and gallery image 16, 4 to 8 in the manual; at the charger's printed 3 A, the 18 Ah pack takes 6.0 hours by simple division. An overnight charge covers it.

What does a full charge of the M20 cost?

About 16 cents to fill the pack: 864 Wh at 18.31 cents per kilowatt-hour, the July 2026 US household average from the U.S. Energy Information Administration, before the charger's own losses. At 15 mph on the throttle, 18.6 Wh a mile works out to about a third of a cent per mile; by state, a full charge runs from about 11 cents in Louisiana to about 41 in Hawaii.

What rider height fits the M20?

Samebike recommends riders from 5'6" to 7'2" on its size-and-fit drawing. Seated on the bench, 72 of 100 riders at 5'8" put both feet flat on the ground, 96 at 5'10" and 30 at 5'6"; the median 5'8" rider's 32.6-inch inseam clears the bench's 32.2 inches by 0.4 inch. The fit tables run from 5'0" to 6'4".

Does the Samebike M20 have a throttle?

Yes: the specification table lists a "Thumb throttle", Samebike's photographs show a thumb lever at the left grip, and the bike has five pedal-assist levels as well. One of Samebike's feature panels is titled "Half Twist Throttle", so tell us if the throttle type matters to you; the range tables show what riding on the throttle, or pedaling with it, does to your miles.

Where do I find the M20 manual?

Samebike's "Manuals and Guides" page links the M20 user manual, a 14-page PDF dated January 2023. It covers assembly with the quick-release front wheel, charging, battery removal, the display, the pre-ride checks and the warranty.

Can I pay for the M20 in installments?

Yes. Our listing's Shop Pay offered four interest-free installments on September 28, 2026, with sample plans of $333.00 every two weeks for six weeks at 0% APR, or $90.17 a month for 12 months at 15% APR ($1,082.04 in total); approval depends on an eligibility check by Affirm's lending partners.

What tire pressure does the M20 use?

The manual sends you to the tire: "According to the actual information on the tire." Read the pressure printed on your own sidewall before you pump, and ask us if it is hard to make out; the tire table turns rolling resistance into miles.

Is the M20 good for off-road riding?

Samebike's FAQ calls the M20 "a model between electric bicycles and electric dirt bikes" and "more suitable for the off-road experience than ordinary electric bikes", and it rides on 20 × 4.0 tires with a lockable fork and a coil rear shock. Whether you may ride it on a given trail is the land manager's call; the trail section shows who decides where.

Does the M20 come with a mirror?

No. Answering why it has none, Samebike's FAQ says e-bikes usually lack rearview mirrors because their design sits closer to traditional bicycles, and asks riders to slow down, turn their heads and use hand signals to check the traffic behind.

How long does delivery take?

From us, orders leave within 1–3 business days and most e-bikes arrive 5–10 business days later, with free shipping in the contiguous United States, per our shipping policy.

Is Samebike a legit brand?

Guangzhou Sameway Electric Bicycle Co., Ltd. makes Samebikes; its about page gives 2004 as its founding year, and the M20 manual prints the company's Guangzhou address. Neither the CPSC's recall database nor its site search listed a recall or warning for Samebike on September 28, 2026, and the figures here trace to Samebike's US store and its manual.

Limitations of this review

What follows is what this review cannot settle on its own, numbered, each with what would settle it where that is known.

1. We sell this bike. Give the red flags the weight you give the green ones.
2. The review is specification-verified: each figure traces to Samebike's published documents, a federal text, our store record, a study cited in the range or fit sections, or arithmetic set out here.
3. Each range number describes one steady ride, one speed on one grade in still air; real stops, starts and headwinds cost more, and a tailwind less.
4. Bafang's published motor stands in for Samebike's. Samebike's documents name no maker, unloaded speed or efficiency curve for the M20's motor, so the model builds it on the shape of Bafang's RM G0H0 at 48 V and 1200 W, unloaded at 31.1 mph. Raising the efficiency from 80% to 82% lifts the 15 mph throttle figure from 47 miles to 51; rating the comparable at 750 W gives 46 there and trims the 8% climb at 10 mph from 8 miles to 6.
5. No measured ride checks the whole chain. Three parts are checked apart (the physics against Martin and colleagues' worked example, the motor against Bafang's rated 80%, and the whole model against Samebike's 70 km pure-electric figure, which a steady 16.1 mph on the throttle reproduces), but only an M20 ridden until the pack ran out, with speed, load and weather recorded, would check it end to end.
6. The torque ceiling is the low end of Samebike's "100+Nm", which states a floor; a higher ceiling changes only the steepest climbs, where the model's motor runs at its cap.
7. The model assumes the full 864 Wh. The documents read here do not say how much of the pack the battery management system lets you use; the 25% reserve comes from one measured pedelec that released 75% in a standard test (researchers at KIT).
8. The tire figure is borrowed, and the wheel size is Samebike's. Rolling resistance is the median of ten 26 × 4.00 tires Bicycle Rolling Resistance measured at 12 psi, bracketed in the tire table, and neither the M20's 20-inch Chao Yang tires nor the manual's INNOVA tires are in that set. The 22.8-inch wheel is Samebike's "Tire width" figure; the circles fitted to the drawn tires read 23.3 inches, 2.1 percent more.
9. One cell's laboratory data carries the cold figures. No cell is named for the M20's pack in the documents read here, so the central line follows McMaster University's LG HG2 data with the cells at air temperature, and other published cells set the brackets.
10. The fit figures rest on a measured drawing. Samebike's size-and-fit drawing, scaled by its wheelbase, supplied the crank's length and height, the bench's height and position and the grips' position, after six of seven checks against Samebike's listed dimensions came within 2.2 percent on it; the total height reads 3.6 percent over.
11. The bench height is read three ways. Samebike lists 32.5 inches and gallery image 17 prints 32.4, while the bench top where its drawing's G line starts measures 32.2; the stop table runs all three. Your barefoot inseam against 32.5 is the conservative check.
12. The riders are soldiers. Every one of the 6,068 bodies was measured for the Army's 2012 ANSUR II survey, so a rider whose proportions are unusual for their height will match the tables less closely.
13. The hand load is an upper bound. It assumes the arms hold up a fully relaxed torso; bracing your core lowers it.
14. Samebike's documents give two or more values for several things. Each set is in the table below the list, and if you email us we will ask Samebike which figure holds for the bike you order.
15. Whether the 330 lb includes the bike is open. Rider plus cargo of 202.1 lb or less fits under either reading at the heaviest listed weight.
16. Certification: the manual shows EPAC EN 15194 and CE marks. No UL 2849 certificate number appears on the US product page, the product record or the manual, and we will ask Samebike for a certificate on your behalf.
17. The throttle type is printed two ways. The specification table and gallery image 15 name a thumb throttle, and a feature panel is titled "Half Twist Throttle"; Samebike's photographs show a thumb lever.
18. The recall search reads the CPSC's US record for the names listed, so a recall filed under a different company name would not appear.
19. Price and stock change. We read both on our listing and on Samebike's US store on September 28, 2026.
20. The charge cost uses one month's national average. EIA marks its July 2026 residential figure of 18.31 cents per kWh as preliminary, your own utility charges its own rate, and the charger's losses, which no document read here states, come on top.

Samebike's own wording for every set, read September 28, 2026; wherever the review had to choose, it used the first column.

The bottom line

For $999, the M20 gives you a 1200 W rear hub with an 1800 W peak and "100+Nm" on Samebike's specification table and motor panel, one removable 864 Wh pack, hydraulic disc brakes, a lockable fork and a coil-over rear shock, 20 × 4.0 tires, seven Shimano gears, a thumb throttle, a headlight and a frame basket, on a moped-style frame with a fixed bench that does not fold.

A 180 lb rider on level pavement gets about 47 miles at 15 mph on the throttle, or 69 with easy pedaling, and a full charge costs about 16 cents at the US average rate. With 1200 W, 50 km/h on the specification table and no class from Samebike, where you may ride it is your state's call.

It suits riders of about 5'8" and up best, where most sit flat-footed on the bench and upright at the bar; under 5'8", check the stop table first, and for long pedaled miles, the RS-A08 II gives you a seat post to raise. Shop Pay on our listing offered four interest-free installments for buyers who qualify.

Send us your height, barefoot inseam and the ride you have in mind before you order. You will hear back how your feet land at a stop and how far you reach to the bar, the ride's cost in watt-hours out of the 864, and how the trails you name treat throttle bikes.

Source register

The tier beside each source names the authority behind it: T1 is law, regulation or government data, T2 is an organization's own publication about its products, terms or measurements, and T3 is peer-reviewed research or a standards body.

Expiry conditions

Any of these would date the page: a new price, specification, range figure or size-and-fit drawing on Samebike's US M20 page; a revised M20 manual; Samebike's written answer on the delivered weight, the load basis, a certificate, the throttle type, or the delivered speed and power; new price, stock or Shop Pay terms on our listing; or a newer month of EIA residential electricity prices.

So would a change in the federal picture: an amendment to 15 U.S.C. § 2085, a class Samebike assigns the M20, or a CPSC recall or warning naming Samebike or Sameway. Verified September 28, 2026.

References

Each document cited on this page, with its publisher, title, the part relied on and the date it was retrieved; the two computations of this review are listed last, with the sections that set them out.

1. SAMEBIKE US (Guangzhou Sameway Electric Bicycle Co., Ltd.), M20 Off Road Peak 1800W Fat Tire Electric Bike — product page (Specifications table; description; stat strip; feature panels; Size and Fit drawing and list; gallery; FAQ; policy block). Retrieved September 28, 2026. https://us.samebike.com/products/m20-off-road-peak-1800w-fat-tire-electric-bike
2. SAMEBIKE US (Shopify product record), M20 — product record (.json) (variants[].price, compare_at_price, sku; images[]; created_at). Retrieved September 28, 2026. https://us.samebike.com/products/m20-off-road-peak-1800w-fat-tire-electric-bike.json
3. Guangzhou Sameway Electric Bicycle Co., Ltd. (SAMEBIKE), Electric Mountain Bicycle — User Manual, Model: M20 (January 2023) (1 Important warning; 2 Unpacking and product specs (manual p. 4); 3 Product components; 4 Method of assembly; 5.1 Charging method; 5.2 LCD Display; 6 Preparation before riding; 7 Warranty policy). Retrieved September 28, 2026. https://cdn.shopify.com/s/files/1/0684/9173/9372/files/M20.pdf?v=1781761276
4. SAMEBIKE US, Warranty Policy ('Frame warranty for 3 years, batteries, motors and other accessories warranty for 1 year'; 'Batteries'). Retrieved September 28, 2026. https://us.samebike.com/pages/warranty-policy
5. SAMEBIKE US, About Us (company paragraph). Retrieved September 28, 2026. https://us.samebike.com/pages/about-us
6. US Government Publishing Office, 15 U.S.C. § 2085 — Low-speed electric bicycles (subsections (a) and (b)). Retrieved September 26, 2026. https://www.govinfo.gov/content/pkg/USCODE-2024-title15/html/USCODE-2024-title15-chap47-sec2085.htm
7. Bureau of Land Management, Department of the Interior, 43 CFR Part 8340 — Off-Road Vehicles, § 8340.0-5 (§ 8340.0-5(a)(5)(iii) and (j)(1)). Retrieved September 26, 2026. https://www.ecfr.gov/current/title-43/subtitle-B/chapter-II/subchapter-H/part-8340
8. Forest Service, Department of Agriculture, 36 CFR Part 261 — Prohibitions (§ 261.13). Retrieved September 26, 2026. https://www.ecfr.gov/current/title-36/chapter-II/subchapter-B/part-261/subpart-A/section-261.13
9. U.S. Department of Agriculture, Forest Service (Office of the Federal Register, eCFR), 36 CFR 261.2 Definitions (§ 261.2, 'Motor vehicle'). Retrieved September 26, 2026. https://www.ecfr.gov/current/title-36/chapter-II/part-261/subpart-A/section-261.2
10. U.S. Department of Agriculture, Forest Service (Office of the Federal Register, eCFR), 36 CFR 261.1b Penalty (§ 261.1b). Retrieved September 26, 2026. https://www.ecfr.gov/current/title-36/chapter-II/part-261/subpart-A/section-261.1b
11. US Consumer Product Safety Commission, CPSC Recall REST service, saferproducts.gov (RecallTitle, ProductName and Manufacturer queries; 623-record corpus). Retrieved September 28, 2026. https://www.saferproducts.gov/
12. US Consumer Product Safety Commission, cpsc.gov site search (queries Samebike and Sameway, with a known-positive control). Retrieved September 28, 2026. https://www.cpsc.gov/search?search_api_fulltext=Samebike
13. U.S. Energy Information Administration, Electric Power Monthly, Table 5.6.A: Average Price of Electricity to Ultimate Customers by End-Use Sector, by State, July 2026 and 2025 (Residential, July 2026 column: U.S. Total, Louisiana, Hawaii). Retrieved September 28, 2026. https://www.eia.gov/electricity/monthly/epm_table_grapher.php?t=epmt_5_6_a
14. Redtail eBikes, Samebike M20 Retro Off-Road Electric Bike — product listing (price, variants, Shop Pay installments block). Retrieved September 28, 2026. https://redtailebikes.com/products/samebike-m20
15. Redtail eBikes, Shipping policy (Processing & delivery; Receiving & damage claims; Where we ship). Retrieved September 28, 2026. https://redtailebikes.com/policies/shipping-policy
16. Redtail eBikes, Refund policy (Change-of-mind returns; Order cancellations). Retrieved September 28, 2026. https://redtailebikes.com/policies/refund-policy
17. Redtail eBikes, Terms of service (delivery inspection paragraph). Retrieved September 28, 2026. https://redtailebikes.com/policies/terms-of-service
18. Affirm, Inc., Affirm's lending partners (lending partners page). Retrieved September 28, 2026. https://www.affirm.com/lenders
19. BAFANG, BAFANG Workbook OEM 2021 (PDF p.23, MOTORS table, H640 column (RM G0H0.750.DC / RM G0H0.1000.DC)). Retrieved September 23, 2026. https://www.bafang-e.com/Uploaded/Labels/BAFANG%20Workbook%20OEM%202021.pdf
20. Bicycle Rolling Resistance (Jarno Bierman), Fat Bike Tires Test Results ('Rolling Resistance 12 psi (default)' column, the 26 x 4.00 rows). Retrieved September 25, 2026. https://www.bicyclerollingresistance.com/fat-bike-reviews
21. Bicycle Rolling Resistance (Jarno Bierman), Kenda Juggernaut Pro 2016 (Rolling Resistance Test Results). Retrieved September 25, 2026. https://www.bicyclerollingresistance.com/fat-bike-reviews/kenda-juggernaut-pro-2016
22. CRR at Different Temperatures: Examining Temperature Dependence of Rolling Resistance. Bicycle Rolling Resistance (Jarno Bierman), results paragraph. Retrieved September 23, 2026. https://www.bicyclerollingresistance.com/specials/crr-temperature-test
23. U.S. Standard Atmosphere, 1976 (NOAA-S/T 76-1562). NOAA, NASA, US Air Force, Table 3 (composition); sea-level values (1976-10). Retrieved September 23, 2026. https://ntrs.nasa.gov/api/citations/19770009539/downloads/19770009539.pdf
24. 2012 Anthropometric Survey of U.S. Army Personnel (ANSUR II), public data release 2017. U.S. Army Natick Soldier Research, Development and Engineering Center, public data files (male 4,082 rows, female 1,986 rows); TR15-007 tables (2017). Retrieved September 26, 2026. https://www.army.mil/article/188601/for_good_measure_natick_releases_raw_data_from_army_wide_anthropometric_survey
25. Clauser, McConville & Young, Weight, volume, and center of mass of segments of the human body, AMRL-TR-69-70. Aerospace Medical Research Laboratory, Wright-Patterson AFB, segment weight and center-of-mass tables (13 cadavers) (1969-08). Retrieved September 25, 2026. https://ntrs.nasa.gov/api/citations/19700027497/downloads/19700027497.pdf
26. UL Solutions, E-Bikes Certification: Evaluating and Testing to UL 2849 (service summary). Retrieved September 26, 2026. https://www.ul.com/services/e-bikes-certificationevaluating-and-testing-ul-2849
27. Martin JC, Milliken DL, Cobb JE, McFadden KL, Coggan AR. Validation of a Mathematical Model for Road Cycling Power. Journal of Applied Biomechanics (Human Kinetics), 14(3):276-291, Eq. 14 and Appendix I; 'chain drive system (Ec) was 97.698' (1998-08-01). Retrieved September 23, 2026. https://collections.lib.utah.edu/dl_files/b4/8e/b48ef26086091662c561e673d7bd990d77868437.pdf
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