Samebike RS-A08 II Review 2026: 1000 W for $1,399

Full-suspension mountain frame · 1000 W rear hub, 1500 W peak · "80+Nm" torque · 48 V 17 Ah, 816 Wh · hydraulic discs, 180 mm rotors · 26 × 4.0 Kenda tires · 45 km/h on the spec table · 79.4 lb · $1,399 · verified September 28, 2026

Quick Answer — The Samebike RS-A08 II is a full-suspension fat-tire mountain e-bike: a 1000 W rear hub with a 1500 W peak, a removable 816 Wh battery, hydraulic disc brakes and 26 × 4.0 Kenda tires, for $1,399. Held at 15 mph on the throttle across level pavement, it carries a 180 lb rider a computed 48 miles.

Pedal lightly at that speed and the same charge stretches to 74 miles by this review's arithmetic; Samebike's own headline is 130 km (81 miles) at pedal-assist level 1. The range section turns each figure into a ride you can plan, and the fit section shows which rider heights the frame and its seat post suit.

What this review covers

What $1,399 buys · What it is · Fit · The motor · The battery · How far it goes · Brakes, lights and controls · Suspension and tires · 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 RS-A08 II review

We read Samebike's figures on September 28, 2026 from its RS-A08-II product page, the product record, the user manual linked from its US manuals page and our listing; the class and trail sections quote the federal texts. The range and fit figures are arithmetic on published inputs, and every section names its inputs, sources and dates.

Every figure is verified against Samebike's published specification and recomputed here, or taken from a source cited beside it, which makes this a specification-verified review. We sell the RS-A08 II, so give its red flags the same attention as the green ones.

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

What $1,399 buys

Read on September 28, 2026: Samebike's product page (title, specification table, feature panels, size-and-fit drawing and list, gallery, FAQ) and the specification page of the manual. Where two of Samebike's documents print different figures, the table gives both or the one this review plans on, and item 14 under Limitations lists each pair.

A full-suspension fat-tire mountain bike on 26 × 4.0 tires

It is a mountain bike first: 26 × 4.0 tires, a sprung fork, a rear shock and a 6061 aluminum frame that does not fold. Samebike titles it the "RS-A08-II Off Road Peak 1500W Fat Tire Mountain Electric Bike", and its suspension panel promises "a smooth riding experience like a flat road on rugged terrain or mountain roads".

Samebike's studio view of the Black RS-A08 II: a rocker-link rear shock, a round headlight on the fork and spoked wheels on fat Kenda tires.

The RS-A08 name belongs to two bikes, so check which one a figure describes. Samebike's US store lists one, the RS-A08-II, at 1000 W rated and 1500 W peak with "80+Nm" of torque. Samebike's Guangzhou site describes the earlier RS-A08 with a "750W Bafang Motor with 1000W peak power" and a 48 V 17 Ah pack of "Samsung 21700 cells".

Samebike's European RS-A08-II page, priced in euros, prints 25 km/h and "1200W peak power and 65Nm maximum torque". Everything below describes the bike Samebike sells in the US, whose 48 V and 17 Ah multiply to 816 watt-hours.

The Gray RS-A08 II from Samebike's gallery; both colors share one frame and one parts list.

Will the RS-A08 II fit you?

On the seat post as Samebike draws it, the saddle reaches the fit formula's height for 61 of every 100 riders at 5'6", 85 at 5'8" and 70 at 5'10"; at Samebike's listed seat heights those shares are 97, 94 and 70. At 6'0", 23 of 100 riders reach it on either reading.

The two readings part at the bottom of the post: Samebike lists a lowest seat height of 35.4 inches, while its drawing places the lowest seat clamp 1.6 inches higher. Standover is the other limit, since the top tube's lowest edge sits 30.7 inches up. Every share comes from placing the 6,068 bodies of the US Army's 2012 survey on Samebike's drawing, with each saddle set at 109% of inseam.

Three steps check the frame against your body:

1. Measure your inseam in socks: stand against a wall, draw a hardcover book up snug where a saddle would sit, and measure floor to spine.
2. Read your height in both saddle tables and in the standover table, checking that your inseam falls inside the row's typical range.
3. Set the saddle on delivery with the heel and knee checks at the end of this section.

Samebike recommends the RS-A08 II for riders 5'3" to 6'3", the window on its size-and-fit drawing and again on gallery image 14, whose height scale marks 170 and 192 cm (5'7" to 6'4" to the nearest inch). Each table below measures riders of one height against the frame in Samebike's drawing, with Samebike's figures kept beside them.

Samebike's drawing at its published 50.4-inch wheelbase. Overall length, the highest seat height read at the clamp and the total height agree with Samebike's figures within 1.3 percent; the lowest seat setting reads 4.6 percent high at the clamp, and the wheel 5.8 percent large.

Will the saddle go high enough for me?

For most riders from 5'6" to 5'10", yes. At 6'0" the post tops out below the formula height for 77 of every 100 riders on either reading, and at 6'2" for 97.

The saddle heights follow one rule, 109% of inseam from the pedal axle to the saddle top, which Peveler et al., 2005 evaluated against knee angle; Ferrer-Roca et al., 2012 back settings as low as 106%.

On Samebike's drawing, measured at the wheelbase scale, the crank axle stands 13.6 inches above the ground, each crank is about 193 mm long and the seat post leans back at 78.9 degrees; every saddle height below starts from those three.

Riders per 100 at each height whose saddle height, at 109% and at 106% of inseam, lands between the drawn post's 39.7 and 42.7 inches, beside the median rider's saddle height above the ground; men and women of the Army survey together. Below 5'6" most riders need the saddle lower than 39.7 inches; those the post cannot lift high enough fall a median of about 1.1 inches short at 6'0", 2.0 at 6'2" and 3.6 at 6'4".

Samebike's lowest listed seat height sits below the drawn one, so the post was run a second time. The highest listed height, 40.0 inches, matches the drawn seat clamp at its top setting, 40.1, with the saddle 2.6 inches above the clamp. Read the same way, the listed 35.4 to 40.0 inches puts the saddle top at 38.0 to 42.6 inches:

Riders of 100 at each height whose 109% saddle height each reading of the post reaches. The listed range adds riders at the short end and changes nothing at the top; at 106% of inseam it reaches 83 of 100 riders at 5'6" and 40 at 5'4".

Under 5'6" the readings part, and the post's true lowest setting decides which applies; from 5'10" up they agree, and the top of the post is the limit. If you stand 6'0" or taller, compare the RS-A02 Pro's saddle table: its drawn post reaches the formula height for 85 of 100 riders at 6'0".

Can I put a foot down at a stop?

From about 5'7" up, yes: 96 of every 100 riders at 5'7" clear the top tube's lowest edge barefoot, 30.7 inches off the ground. At 5'4" the share falls to 43 of 100, and at 5'2" to 11.

The top tube dips lowest just ahead of the seat cluster, and that edge was measured on Samebike's drawing at the wheelbase scale.

Barefoot inseam minus 30.7 inches, read at the shortest-legged riders of each height: 95 of 100 have at least this much clearance, and a minus sign means the tube sits above those riders' inseam. The inseam column is the median rider's, and shoes add to every figure.

Shorter than about 5'6"? The RS-A02 Plus carries the same 816 Wh and hydraulic brakes on a frame whose lowest top edge is 26.7 inches, which 95 of 100 riders at 5'0" clear.

Will I feel cramped, or stretched?

At the drawn bar height the median rider sits 15 to 23 degrees forward of upright, with the grips 30.3 to 34.9 inches above the crank axle and 17.6 to 22.4 inches ahead of it.

In a comparison of three trunk angles, twenty recreational riders rated the most upright one the most comfortable (Priego Quesada et al., 2017). Each angle below is the least forward tilt that lets a straight arm reach the grip from the sit bones, for the torso and arm lengths of every body in the survey.

The median rider's lean at each height with the bar where Samebike draws it; the spread covers every saddle position and the whole grip cluster.

Samebike's listed total height, 45.6 inches, sits within 1.3 percent of the drawn grips, so one bar height serves both readings. On the listed seat range the shortest riders sit lower and lean less: at 5'0" the median rider leans 20 degrees there, against 23 on the drawn post.

How much weight goes through my wrists?

Roughly a sixth: with the back fully relaxed, the median rider puts 16 to 18 percent of body weight on the grips at the drawn bar height. In a lab, ten road racers riding on their brake hoods put 15% of body weight through the bars (Carahalios, 2015).

Hand pressure over the part of the palm the ulnar nerve crosses peaked in the most stretched-out of the positions Slane et al., 2011 measured across 36 riders. Raising the bar, or letting your core hold the trunk up, takes weight off the wrists.

An upper bound on the load with the back relaxed and the bar as drawn, built from each body's segment weights (Clauser et al., 1969) and the survey's median weight at each height; the spread covers every saddle and grip position.

On the listed seat range the share stays at 16 to 17 percent from 5'0" to 6'4", within a point of the drawn post at every height.

How do I set the saddle when it arrives?

Set the saddle so the knee bends 25 to 35 degrees with the pedal at its lowest point (Peveler et al., 2007). The quick way needs no instruments: rest your heel on the lower pedal, raise the saddle until that leg is straight, then ride on the ball of your foot.

The saddle in Samebike's photograph; its panel says to "freely modify the height to fit riders' height".

Among 19 cyclists, that heel method landed 70% inside the target knee range, a better result than either inseam formula managed (Peveler et al., 2005). The manual fixes the seat post with a quick-release lever, so close it firmly once the height is right and run its pre-ride check of the brakes, wheels and handlebar.

How we computed fit

Three calculations carry this section: saddle top = 1.09 × inseam above the pedal axle; lean = the smallest trunk angle at which a straight arm reaches the grip; hand load = head, trunk and arms weighed against how far ahead of the sit bones they hang and where the grips sit.

A 5'8" rider with the median 32.6-inch inseam needs 35.6 inches from the pedal, or 28.0 from the crank axle (88.3% of inseam would give 28.8), which puts the saddle top 41.0 inches above the ground, inside the drawn post's 39.7 to 42.7.

Nothing was read off the drawing until it had reproduced Samebike's own dimensions:

The scale is Samebike's published wheelbase, 1280.2 mm (50.4 in), between axle centers found by fitting a circle to each tire. Three dimensions agree within 1.3 percent; the lowest seat setting at the clamp reads 4.6 percent high, which is why the saddle tables run twice, and the drawn wheel measures 5.8 percent larger than the 29 inches Samebike labels "Tire width".

The motor: 1000 W rated, 1500 W peak, 80+ N·m

Samebike rates the rear hub at 1000 W and prints 1500 W at peak in the product title, on the specification table and on its motor panel, which reads: "The powerful motor is with 80+Nm torque, allowing you to drive at high speeds and cruise almost effortlessly in assist mode."

The page's FAQ answer about steep climbs mentions "a powerful 750W motor"; the specification table and the title say 1000 W rated, and the range model runs the motor at 1000 W with 80 N·m as its torque ceiling.

The rear hub in Samebike's photograph: a seven-cog freewheel on the motor, the chain, and the rear caliper, marked MINERAL OIL.

Throttle or pedals, your choice at any moment. The thumb throttle moves the bike with no pedaling, and five assist levels add motor power while you pedal. The manual numbers the levels 0 to 5: 0 stops the motor's output, 1 is the gentlest, 5 the strongest, and the display starts at 1.

Samebike's FAQ lists three ways to ride it: full electric, pedal assist, and manual with the motor idle. Your gear choice sets your cadence, because the hub turns with the wheel in all seven gears; a shift changes how fast your legs spin, and the battery feels it only through the watts you add, which the gear table prices.

The battery: 816 Wh from 48 V and 17 Ah

Forty-eight volts times 17 amp-hours is 816 watt-hours, the number every range figure here divides into. Samebike's battery panel describes "a 48v, 17ah removable lithium-ion battery", and its FAQ calls it "Our Samsung battery".

The manual shows the pack coming out in three frames: turn the key clockwise to unlock it, lift it upward, and carry it off to charge. It charges on the bike or off it, and the charger's light shows red while charging and green when the pack is full.

The charger's printed output is 54.6 V 3 A, so 17 Ah takes 5.7 hours at 3 A by simple division. Plan on up to 8 hours from empty: the specification table gives 4 to 6 hours, the manual 4 to 8.

Each of Samebike's range claims, divided into the pack, tells you how many watt-hours a mile it allows:

816 Wh divided by each distance; the range section finds the steady ride behind each. The manual prints its two bands as 50–62 and 25–28 miles beside the kilometers.

How far the RS-A08 II goes on one charge

On one charge a 180 lb rider covers about 48 miles of level pavement at 15 mph on the throttle, 39 at 18 mph, and 74 at 15 mph pedaling easily. Up a steady 4% grade at 10 mph on the throttle, the same charge lasts about 19 miles.

To size your own ride:

1. Find your speed and your effort in the first two tables.
2. Add 147 to 191 Wh for each 1,000 feet you climb, the throttle's cost at 10 mph in the hill table.
3. Correct for your weight and the temperature, then count on 75% of what remains.

Behind every figure is one steady-state calculation: 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 that matched riders on a real road. The formula subsection works one ride through by hand.

Does riding faster cut range? Miles at each speed

Speed is the biggest lever on level ground: a charge that lasts 67 miles at 10 mph on the throttle lasts 34 at 20 mph, because the air's share of the power grows with the cube of speed.

Throttle only, level pavement, 77 °F, 180 lb of rider on the 79.4 lb bike. The last column keeps a quarter of the pack in reserve, the share one pedelec left unused in a standard laboratory range test (Schmitt, Decker and Doppelbauer, 2019).

Your legs beat every other change: add 75 W at 15 mph and a full charge grows from 48 miles to 74. Easy here means 75 W and steady 150 W; with the motor off, those efforts would move this bike across level ground at about 9.0 and 13.1 mph, a quick way to tell which column is yours.

Miles per full charge on level pavement with 180 lb aboard. At 15 mph, easy pedaling draws 11.1 Wh a mile from the pack against 17.0 for the throttle alone. The 148-mile figure leans hardest on your own output and on the motor's losses at light load, the model's least certain input (Limitations item 4).

Assist levels change how eagerly the controller joins in; distance follows the speed you settle at and the watts you contribute, so match a row to how you ride.

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

Pick the gear your knees prefer; the battery answers to your effort. The hub turns with the wheel in any gear, so the draw moves only with your watts:

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

Low gears pay off on climbs: 150 W of steady pedaling at 12 mph up a 4% grade cuts the battery's share from 44.1 Wh a mile to 25.1, and the easiest cog is what makes that effort something you can hold.

Does going uphill drain the battery faster?

Yes: at 10 mph on the throttle, each 1,000 feet of climbing on a 4 to 10% grade costs 147 to 191 Wh beyond the same distance on the flat. Raising 259.4 lb through 1,000 feet takes about 98 Wh at the rear wheel, and the motor's and battery's losses make up the rest.

Each row holds 10 mph with 180 lb aboard: the middle columns on the throttle alone, the last with 75 W of easy pedaling added. Samebike's specification table lists a "Climb slope" of 40°, and the manual a "Max Angle of Climb" of 25 degrees.

Price a hilly ride in two parts, the flat miles and the climbing, and add them. Ten flat miles at 15 mph on the throttle use about 170 Wh, and 500 feet at 6% adds about 80, so roughly 250 of the 816. Stops and headwinds add more, since the model holds each mile at one steady speed.

Does rider weight affect range?

On level ground a little, on a climb a great deal. Extra pounds load the tires and the hill while the air's share stays the same, so weight matters more the steeper the road.

Rider and cargo together, with the 79.4 lb bike on top of each row; throttle only. The bottom row is the 330 lb load capacity on Samebike's drawing and in the manual.

From 180 lb to 330 lb, the level ride at 15 mph loses 9 miles, 48 to 39, while the 8% climb at 10 mph drops from 10 miles to 5.

Does cold weather drain the battery?

Yes: the 15 mph throttle ride that reaches 48 miles at 77 °F falls to about 38 at 32 °F and about 34 at 14 °F.

180 lb rider on level pavement, throttle only. The central figure follows McMaster University's measurements of an LG HG2 cell discharged at 0.5C at 77, 50, 32 and 14 °F, interpolated between them, with the cells at air temperature; the bracketed figures show the spread across other published cell tests, which widens below freezing (Limitations item 9).

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

The rubber stiffens too: the model adds about 0.9% rolling resistance for each 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 adds nothing further below 41 °F.

Do the tires cut range? Tires and riding position

The tire alone moves the level 15 mph range between 44 and 55 miles. On its drum at 12 psi, 18 mph and 94 lb on the wheel, Bicycle Rolling Resistance measured ten 26 × 4.00 fat tires at 23.2 to 42.1 W, and this model takes their median.

Level miles on a full charge, 180 lb rider, throttle only. Schwalbe's Jumbo Jim LiteSkin rolled easiest of the ten on the drum and Kenda's Juggernaut Pro hardest; in Samebike's photographs the RS-A08 II rides on Kenda Krusade 26 × 4.0 tires.

The manual sets tire pressure "According to the actual information on the tire", counts under-inflation among the habits that cut range, and asks you to check the pressure before riding.

Posture counts for more as speed rises. Tengattini and Bigazzi's roadside measurements put 37 upright cruiser riders at 0.640 m² of drag area, the value used here, and 90 everyday mountain-bike riders at 0.603 m²; riding like the second group adds about a mile and a half at 18 mph, 39 to 40.

What Samebike's 130 km and 65 km mean on a real ride

Samebike states the RS-A08 II's range seven ways across its page, FAQ and manual, and each matches a different steady ride. Its headline, "UP TO 130KM Pas 1 Mode Range", assumes assist level 1.

• 130 km (81 miles), the page's headline: 10.1 Wh a mile, easy pedaling at about 14.4 mph on the flat, or steady pedaling near 17.5 mph.
• 74 miles in the FAQ, and 120 km (75 miles) at the top of the manual's band: about 11 Wh a mile, easy pedaling near 15.0 mph.
• 100 km (62 miles), the bottom of the manual's pedal-assist band: 13.1 Wh a mile, easy pedaling at about 16.4 mph.
• 65 km (40 miles), the page's pure-electric figure: 20.2 Wh a mile, the throttle alone at a steady 17.5 mph.
• 60 km (37 miles) in the FAQ and 50 km (31 miles) at the low end of the manual: 21.9 to 26.3 Wh a mile, the throttle alone at about 18.6 to 21.2 mph.

Samebike's larger figures assume gentle pedaling, and its smaller ones a throttle-only ride of roughly 17.5 to 21.2 mph. On its European RS-A08-II page Samebike says the 130 km was "Tested by a 75KG rider on a flat road", a 165 lb rider.

Plan on three-quarters of any full-charge figure. One pedelec delivered 75% of its nominal energy in a standard laboratory range test, the remainder held back to protect the cells (Schmitt, Decker and Doppelbauer, 2019); on that basis the 48-mile throttle ride at 15 mph becomes a 36-mile plan.

How every figure here is worked out

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

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

In it, v is speed; m the mass of rider, cargo and bike together; g gravity; θ the slope; Crr the tires' rolling resistance, where 0.0105 is a drag of 1.05% of the load they carry; ρ the air density; and CdA the drag area, how large a hole the rider cuts through the air.

From the wheel back to the battery, the calculation takes four steps:

1. Your pedaling reaches the wheel through a chain Martin and colleagues measured at 97.7% efficient, 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 its rated point, at no less than 80% efficiency. The model rescales that shape to the RS-A08 II's 48 V and 1000 W, sets the no-load speed at 28.0 mph from Samebike's 45 km/h, and caps the torque at 80 N·m.
3. The battery loses a few percent as heat in 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 power in watts divided by the speed in mph, and the miles are the 816 Wh, corrected for temperature, divided by that.

One ride worked by hand: a throttle-only mile at 15 mph on level pavement with 180 lb aboard. Rolling takes 81.54 W and the air 114.23 W, 195.77 W at the wheel together.

At that speed the 29-inch wheel turns 174 rpm. Built from Bafang's published figures at 48 V and 1000 W, the motor model has a torque constant of 1.414 N·m per amp, 0.304 Ω of winding resistance and a 1.10 A no-load current, so here it makes 10.8 N·m on 8.7 A at 79% efficiency.

After the pack's own losses the cells deliver 255.6 W, or 17.04 Wh a mile at 15 mph: 816 ÷ 17.04 is 47.9 miles, and 35.9 with a quarter kept back.

What the model is checked against. Every part of it reproduces a number its own source published:

The physics against Martin and colleagues' Appendix I example (8.36 m/s ground speed, a 90 kg system on a 0.3% grade); the motor against Bafang's rated point for the comparable RM G0H0; and the whole chain against the pure-electric range on Samebike's product page, which a steady 17.5 mph on the throttle matches.

No measurement of an RS-A08 II ridden to an empty pack, with its speed and load stated, is among the sources read for this review; Limitations item 5 covers what that leaves open.

Brakes, lights and controls

Hydraulic discs at both wheels on 180 mm rotors, with a cut-off that stops the motor when you brake. Samebike's brake panel reads: "Large 180mm hydraulic brakes at both the front and rear allow for quick stops. We added a motor cut-off feature for added safety." Its specification table lists a "Hydraulic dual disc brake", and gallery image 11 adds "Comes with 2 piston hydraulic disc brakes."

Samebike's brake photograph: the front caliper and rotor on the left, the rear on the right.

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

Samebike's cockpit photograph: levers at both grips, the control pad at the left, the shifter and thumb throttle at the right, and the color display between them with every segment lit.

Lights at both ends and a horn on the bar. Samebike's lighting panel promises a "Bright front light, tailight and reflective stripe"; the manual lists an "Electric Horn Installed", and a short press of the headlight key switches the lights on and dims the screen.

Samebike's lighting photograph: the round headlight on, and the tail light under the saddle.

The display reports speed (current, maximum and average), trip and total distance, the battery and the assist level, and shows an error code if the electrical system faults. Hold its key for 2 seconds and push assist moves the bike at under 6 km/h, for walking beside it only; the USB port gives 5 V 1 A, and the display turns itself off after 10 idle minutes, per the manual.

A 100 mm fork, a rear shock and 26 × 4.0 Kenda tires

Sprung at both ends. The specification table lists "Adjustable front fork & rear suspension", and the panel Samebike titles "Full Suspension Boost Stability" describes "an effective 100mm double-crown front fork and a 1000-pound hydraulic rear suspension, which significantly improves riding comfort and versatility".

Samebike's headlight photograph, with the fork legs rising on either side of the head tube.

Two front ends appear in Samebike's photographs, and we confirm which one ships with your order. Samebike's feature photographs show the fork legs running up beside the head tube, as the double-crown description has them, while its studio photographs, including the one on this page's cover, show the crown below the head tube. Email us before you order and we will get Samebike's answer for the bike you would receive.

The rear unit in Samebike's rear-suspension photograph is a black HLT-100 shock on a rocker link. Samebike's copy calls it a "1000-pound hydraulic rear suspension" in one panel and says "The rear air suspension is enhanced" in another, so the same question applies at the back.

The rear shock in Samebike's photograph, on its rocker link below the A08 badge.

The tires are Kenda Krusades in 26 × 4.0 in Samebike's photographs. Its tire panel promises "Puncture-resistant fat tires", and gallery image 13 pictures them on snow, beach, flat and gravel roads.

Samebike's tire photograph: the Kenda Krusade on the spoked front wheel.

The tire table turns rolling resistance and riding position into miles.

79.4 pounds, and a 330-pound load rating

Samebike's specification table weighs the RS-A08 II at 36 kg, 79.4 lb, the heaviest of the five figures it prints, so plan your lifting on it. The drawing says 79.3 lb, the FAQ "about 77lb", gallery image 14 74.9 lb, and the manual 73.8 lb (33.5 kg).

The load rating is 330 lb (150 kg) on the drawing, on gallery image 14 and in the manual, while the specification table lists a "Payload" of 180 kg (397 lb). Plan on 330: rider plus cargo of 250.6 lb or less fits even if that figure includes the bike, and nearer the line, email us and we will get Samebike's answer in writing first.

The carton measures 1610 × 320 × 810 mm (63.4 × 12.6 × 31.9 inches) and weighs 83.7 lb (38 kg) per the manual, a two-person lift at the curb. The bike does not fold ("Foldable: No" on the specification table), and it is about 80 inches long: 80.7 on the size-and-fit list, 78.3 in the manual.

The Mercer fit test

Seven archetype riders, the Mercers, stand in for the buyers each review measures (meet the Mercers). Each verdict rests on Samebike's published height window, weight and load capacity, and on the fit tables computed from its drawing.

Ruth and Maya show where the two seat-post readings matter, and Jack where both run short. At 5'5" Ruth reaches the formula height on 37 of 100 drawn posts and 91 on the listed range; at 6'1" Jack's 7 of 100 holds on either reading, so his inseam, and whether he rides at the 106% setting (37 to 38 of 100 riders his height), decides it.

The Gray RS-A08 II from the front three-quarter, one of two colors on our listing at $1,399.

Is it UL certified?

Samebike's manual for the RS-A08 ends its English section with two marks: "EPAC EN 15194" and CE. UL Solutions certifies e-bikes to UL 2849, a separate standard, by testing the electrical drive train, battery and charger together as a system.

If a landlord, building manager or insurer asks for a UL 2849 certificate, tell us before your bike ships and we will put the request to Samebike.

Has it been recalled?

No. On September 28, 2026, the CPSC's recall database held nothing under Samebike, Same bike, Samebikes, Sameway or Guangzhou Sameway, searched in recall titles, product names and manufacturers, while three other brands' known recalls came back as controls. None of the 623 bicycle, e-bike, battery and scooter recalls saved on September 25 mentions the RS-A08.

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

The class question: 1000 W, 45 km/h and a throttle

Samebike assigns the RS-A08 II no class on its US page, so your state's definition decides. Those definitions test what Samebike publishes: 1000 W rated with a 1500 W peak, 45 km/h (28.0 mph) on the specification table, and a thumb throttle that drives the bike without 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 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, Samebike's product page and the RS-A08 manual, each read on September 28, 2026.

If your state's definition turns on watts or top speed, ask us first. Section 2085's 750 watts could be read as continuous or as peak output, so we will ask Samebike to put the delivered unit's figures in writing.

The manual also advises checking with your insurer or broker, since an existing policy may not cover riding an electric bike. Each state's definition is in our 50-state e-bike law atlas.

Where you can ride it

A trail posted for class 1 e-bikes only is closed to this bike. The federal class 1 definition covers a motor that "provides assistance only when the rider is pedaling" (43 CFR 8340.0-5(j)(1)), and the RS-A08 II has a throttle. Which rule applies depends on whose land you are riding.

On Bureau of Land Management land, 43 CFR 8340.0-5 builds three e-bike classes on 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 sets of rules; the specification sheet decides none of them.

Inside a National Forest, a trail the motor vehicle use map leaves closed is closed to the RS-A08 II, and federal regulation sets the penalty. Under 36 CFR 261.2 a motor vehicle is "any vehicle which is self-propelled", and 36 CFR 261.1b punishes a Part 261 violation with "imprisonment of not more than six months", a fine under 18 U.S.C. 3571, or both. Get the district's map before the trip.

Gallery image 6: a rider on the Black RS-A08 II over desert scrub. Open ground like this still has a land manager, and that office's e-bike rule applies.

Samebike's gallery pictures the tires on snow, beach, flat and gravel roads; for public land of each kind, our public-land guide sets out every federal agency's e-bike rules.

Green flags / Red flags

Green flags

• $1,399, Samebike's own US price: matched on September 28, 2026, with $1,799 shown as the regular price for both colors.
• Hydraulic discs on 180 mm rotors, with a motor cut-off, named on the specification table and the brake panel.
• 816 Wh in a pack that lifts out: about 74 computed miles at 15 mph with easy pedaling for a 180 lb rider, and you can charge it in the frame or on a table.
• A 100 mm fork and a rear shock on Kenda 26 × 4.0 tires and spoked wheels.
• "80+Nm" from a 1000 W hub, with a 1500 W peak on the specification table.
• Free shipping, and we handle damage claims: no charge within the contiguous United States, and if the bike arrives damaged and you tell us within 48 hours, we file with the carrier.
• Headlight, tail light, reflective stripe, horn and USB port, all fitted as standard.
• About 15 cents a full charge at the average US household electricity price for July 2026.

Red flags

Every red flag below concerns fit, and each points to the page or bike to look at instead.

• Wrong if you are under about 5'6" and want both feet down at a stop. The top tube's lowest edge is 30.7 inches up, which 85 of 100 riders at 5'6" clear barefoot and 43 of 100 at 5'4"; the RS-A02 Plus keeps an 816 Wh pack and hydraulic discs on a frame 95 of 100 riders at 5'0" clear.
• Wrong until you check your inseam, if you are 6'0" or taller. The post reaches the 109% height for 23 of 100 riders at 6'0" and 3 at 6'2" on either reading; the RS-A02 Pro's drawn post reaches it for 85 of 100 at 6'0".
• Wrong if it has to ride in a car trunk or live in a closet. It does not fold; the RS-A02 Plus folds to 37.8 × 29.1 × 39.8 inches with the same 816 Wh, for $1,199.
• Wrong if your budget stops at $999. The LO26 Plus folds on 26 × 3.0 tires with a fork, a rear shock and hydraulic discs for $999.
• Wrong for trails signed class 1 only. Those signs exclude throttle bikes; our public-land guide explains each federal agency's rule, and we will read the sign on your trail with you.
• Wrong for a rider under your state's minimum age. Our 50-state atlas gives the age for each state; send us the rider's age and we will suggest a bike from our shelf that qualifies.

Buy it if / Buy something else if

Buy it if you want a full-suspension fat-tire mountain bike with hydraulic brakes and an 816 Wh pack; you stand about 5'6" to 5'10", where the seat post suits most riders on at least one reading and 85 of 100 or more clear the top tube; and it can live full-length in a garage or on a rack.

For $1,399 the RS-A08 II brings a 1000 W hub with "80+Nm" and a 1500 W peak, a removable 816 Wh pack, hydraulic discs on 180 mm rotors, a 100 mm fork and a rear shock, Kenda 26 × 4.0 tires, seven Shimano gears, a thumb throttle, five assist levels and lights at both ends.

Paying over time? Our listing shows Shop Pay Installments sample plans of $126.27 a month for 12 months at 15% APR, $1,515.24 all in, or $478.04 a month for 3 months ($1,434.12), each subject to an eligibility check.

Buy something else if you are under about 5'6", where the RS-A02 Plus keeps the pack and the brakes on a lower frame; if it must fold into a car, where the RS-A02 Plus folds to 37.8 × 29.1 × 39.8 inches; or if $999 is the ceiling, where the LO26 Plus and the RS-A02 Pro sit. At 6'0" and taller, check the saddle table against your inseam first.

The Black RS-A08 II from Samebike's gallery.

Samebike's other reviews run the same range and fit models: the RS-A02 Plus, the RS-A02 Pro, the LO26 Plus, the CY20 Pro, the M20-III, the M20, the STORM and the CREST. Our Samebike brand profile sets all ten Samebikes we stock side by side, and our e-bike reviews hub sorts other makers' bikes by style, rider and price.

Before you buy: the checklist

Eight checks before you spend $1,399; the first three decide whether the bike suits your body and your routes.

1. Measure your inseam in socks and find your height in the saddle tables and the standover table.
2. Look up your state's definition and minimum age in our atlas, then the class signs on the paths you use.
3. Price your usual ride in watt-hours from the range tables and keep 25% back.
4. Measure where it will live against about 80 inches of length and 45.6 inches of height; it does not fold.
5. Line up a second person for delivery: 83.7 lb in the carton, 79.4 lb out of it.
6. Keep rider plus cargo under 330 lb, and ask us if you are close.
7. Set aside a charging spot where the pack can stay for up to 8 hours.
8. Call your insurer about e-bike riding, as the manual suggests.

Buying it from us

Why buy the RS-A08 II from Redtail

On September 28, 2026 our $1,399 matched the price listed on Samebike's US store for both colors. What buying from us adds is in the table.

Changing your mind after delivery falls under our refund policy: the box must be unopened and factory-sealed, the request made within 72 hours, and a 15% restocking fee plus return shipping applies; a canceled order costs 3%. Questions about fit and routes cost nothing, so send them before you buy.

Frequently asked questions

How far can the Samebike RS-A08 II go on one charge?

About 48 miles at 15 mph on the throttle for a 180 lb rider on level pavement, by this review's computation; pedal lightly at that speed and you get about 74, and at 18 mph on the throttle about 39. A steady 4% climb at 10 mph cuts it to about 19. Samebike's headline is 130 km (81 miles) at pedal-assist level 1, and the range tables adjust for your weight, hills and the cold.

What is the top speed of the Samebike RS-A08 II?

45 km/h (28.0 mph) on Samebike's specification table and motor panel; the manual lists 25 km/h. If your state's definition turns on speed, email us and we will get Samebike's written figure for the bike you would receive.

Is the RS-A08 II 1000 W or 750 W?

1000 W rated with a 1500 W peak, on Samebike's US specification table, in the product title and on the motor panel. The same page's FAQ mentions "a powerful 750W motor", and Samebike's Guangzhou site lists the earlier RS-A08 with a "750W Bafang Motor with 1000W peak power".

What's the difference between the RS-A08 and the RS-A08 II?

Samebike's US store sells the RS-A08-II: 1000 W rated, 1500 W peak, "80+Nm", 45 km/h, a 48 V 17 Ah pack and 26 × 4.0 tires, for $1,399. Samebike's Guangzhou site describes the earlier RS-A08 with a "750W Bafang Motor with 1000W peak power" and a 48 V 17 Ah pack of "Samsung 21700 cells". When you read a figure online, check which of the two it describes.

Is the RS-A08 II street legal, and what class is it?

That depends on your state, because Samebike assigns it no class. State definitions weigh the motor's watts, the top speed and whether a throttle works without pedaling; for this bike those are 1000 W rated (1500 W peak), 45 km/h on the specification table, and yes. Look up your state's wording in our 50-state atlas, and the federal definition in the class section.

How much does the Samebike RS-A08 II weigh?

Plan on 79.4 lb, the 36 kg on Samebike's specification table. Samebike also prints 79.3 lb on its drawing, "about 77lb" in its FAQ, 74.9 lb on gallery image 14 and 73.8 lb (33.5 kg) in the manual; boxed, it ships at 83.7 lb (38 kg).

What is the RS-A08 II's weight limit?

330 lb (150 kg) on Samebike's size-and-fit drawing, on gallery image 14 and in the manual; the specification table lists a "Payload" of 180 kg (397 lb). Keep yourself plus cargo at 250.6 lb or less and you stay under 330 even if that figure includes the bike; near the line, email us for Samebike's answer.

How much torque does the RS-A08 II have?

Samebike prints "80+Nm" on its specification table and motor panel, which says the torque lets you "cruise almost effortlessly in assist mode"; the range model caps the motor at 80 N·m. Figures you meet elsewhere may describe the earlier RS-A08 or Samebike's European version, as the difference question above explains.

What battery does the RS-A08 II have?

A 48 V, 17 Ah pack, 816 Wh, that rides in the down tube and comes out with its key; Samebike's FAQ calls it "Our Samsung battery". Every range figure on this page starts from those 816 Wh, and the battery section turns each of Samebike's range claims into watt-hours per mile.

Can you replace the RS-A08 II battery?

Yes: turn the key clockwise and the pack lifts out upward, per the manual. Samebike's warranty policy covers batteries for a year and then offers a prorated credit toward a new one, scaled to months of use. When you need one, send us your order number and we will source the matching pack.

How long does the RS-A08 II take to charge?

4 to 6 hours on Samebike's specification table, 4 to 8 in the manual; the 54.6 V 3 A charger refills 17 Ah in 5.7 hours by simple division. Charge overnight, with the pack on the bike or off it.

What does a full charge of the RS-A08 II cost?

About 15 cents: 816 Wh at the 18.31 cents per kilowatt-hour US households paid on average in July 2026, according to the U.S. Energy Information Administration, before the charger's own losses. At the 15 mph throttle rate of 17.0 Wh a mile that is about a third of a cent a mile, and across the states a full charge runs from about 10 cents in Louisiana to about 39 in Hawaii.

What rider height fits the RS-A08 II?

Samebike recommends 5'3" to 6'3" on its size-and-fit drawing and gallery image 14. On that drawing a 5'8" rider with the median 32.6-inch inseam needs the saddle 41.0 inches up, inside the drawn post's 39.7 to 42.7, and 99 of 100 riders that tall clear the top tube barefoot; the fit tables cover every height from 5'0" to 6'4".

Does the Samebike RS-A08 II have a throttle?

Yes, a thumb throttle, listed on Samebike's specification table and pictured at the right grip beside the shifter, alongside five pedal-assist levels. Samebike's FAQ describes three ways to ride, full electric, pedal assist or manual, and the range tables show what each costs you in miles.

Is the RS-A08 II good for off-road riding?

Samebike titles it an off-road bike, and it has the parts: a 100 mm fork, a rear shock and 26 × 4.0 Kenda tires, which Samebike says give "a smooth riding experience like a flat road on rugged terrain or mountain roads". Whether a particular trail is open to you depends on its posted rules, and the trail section shows who writes them.

What tire pressure does the RS-A08 II use?

The manual sends you to the tire itself: "According to the actual information on the tire." The tires in Samebike's photographs are Kenda Krusades in 26 × 4.0, so read the pressure range on the sidewall before inflating; Kenda's own size table gives 30 in its PSI column for the Krusade Sport in 26 × 4.00 with a wire bead, and the tire table prices rolling resistance in miles.

Where do I find the RS-A08 II manual?

Samebike links the RS-A08-II user manual from its US "Manuals and Guides" page; its English section, which names the model as RS-A08, covers assembly, charging, the display, the pre-ride checks and the warranty.

Can I pay for the RS-A08 II in installments?

Yes, through Shop Pay on our listing: sample plans of $126.27 a month for 12 months at 15% APR, $1,515.24 in total, or $478.04 a month for 3 months, read September 28, 2026 and subject to an eligibility check by Affirm's lending partners.

Is Samebike a legit brand?

Samebike is the brand of Guangzhou Sameway Electric Bicycle Co., Ltd., which its about page dates to 2004, and the manual names the same company at its Guangzhou factory address. The CPSC's recall database and site search held no recall or warning naming Samebike on September 28, 2026, and every figure in this review comes from Samebike's US store or its manual.

Limitations of this review

What this review cannot settle by itself, in nineteen numbered points, each with what would settle it where we know.

1. We sell this bike. Give the red flags the same weight as the green ones.
2. This is a specification-verified review: its figures come from Samebike's published documents, federal texts, our store record, the studies the range and fit sections cite, or arithmetic on this page.
3. Each range figure is one steady ride at one speed and grade in still air; stops, starts and headwinds cost more, and tailwinds less.
4. Bafang's published motor stands in for Samebike's. The documents read here give the RS-A08 II's motor no maker, no-load speed or efficiency curve, so the model keeps the shape of Bafang's RM G0H0 at the RS-A08 II's 48 V and 1000 W, unloaded at 28.0 mph. At 82% efficiency in place of 80%, the 15 mph throttle figure rises from 48 miles to 52; with the comparable rated at 750 W it stays at 48, and the 8% climb at 10 mph falls from 10 miles to 9.
5. No measured ride checks the whole chain. The physics reproduces Martin and colleagues' worked example, the motor reproduces Bafang's 80% at its rated point, and Samebike's 65 km pure-electric figure matches a steady 17.5 mph on the throttle; an RS-A08 II ridden to empty with its speed, load and weather stated would test the rest.
6. The torque ceiling is Samebike's "80+Nm". The model caps the motor at 80 N·m.
7. Every figure assumes the full 816 Wh. How much of the pack the battery management system releases is not stated in the documents read here; one measured pedelec gave up 75% in a standard test (researchers at KIT), the source of the 25% reserve.
8. The tire coefficient is borrowed; the wheel is Samebike's figure. The model uses the median of ten 26 × 4.00 tires at 12 psi from Bicycle Rolling Resistance's fat-tire table, bracketed in the tire table. The 29-inch wheel is Samebike's "Tire width" figure, drawn across the whole wheel; circles fitted to the drawn tires measure 30.7 inches.
9. The cold figures rest on one cell's laboratory data. Samebike's FAQ calls the pack a "Samsung battery" and names no cell model, so the central line uses McMaster University's LG HG2 data, bracketed by other published cells, with the cells at air temperature.
10. The fit figures rest on a measured drawing. Crank length, crank height, seat angle, grip position and the top tube's lowest edge were measured on Samebike's size-and-fit drawing at the wheelbase scale, where three of Samebike's own dimensions agree within 1.3 percent.
11. Two readings of the seat post are printed. Samebike lists seat heights of 35.4 to 40.0 inches; its drawing matches the highest at the seat clamp but draws the lowest 1.6 inches higher. The first saddle table uses the drawn post and the second the listed range read at the clamp; a written answer from Samebike on the post's lowest setting would settle which applies.
12. The riders are soldiers. All 6,068 bodies come from the Army's 2012 ANSUR II survey, not the general public; if your build is unusual for your height, the tables fit you less exactly.
13. The hand load is an upper bound. It lets the upper body hang from the arms; a braced core lowers it.
14. Samebike's documents give two values for several things. The table after this list sets out each pair; email us and we will ask Samebike which applies to the bike you order.
15. Whether the 330 lb includes the bike is open. Rider plus cargo of 250.6 lb or less fits under either reading.
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; we will ask Samebike for one on your behalf.
17. The recall check covers the CPSC's US record under the names listed; a recall filed under another company name would not show.
18. Price and stock change. Both were read from our listing and Samebike's store on September 28, 2026.
19. The charge cost is a national average for one month. EIA's July 2026 residential average of 18.31 cents per kWh is a preliminary estimate, your utility's rate will differ, and the charger's own losses, which are not in the documents read here, add to it.

Each pair as Samebike prints it, read September 28, 2026; this review plans on the figure in the first column.

The bottom line

For $1,399, the RS-A08 II gives you a 1000 W rear hub with "80+Nm" and a 1500 W peak, a removable 816 Wh pack, hydraulic discs on 180 mm rotors, a 100 mm fork and a rear shock, Kenda 26 × 4.0 tires, seven Shimano gears, a thumb throttle and lights at both ends, on a full-suspension frame that does not fold.

On level pavement a 180 lb rider gets about 48 miles at 15 mph on the throttle and 74 pedaling easily, and a full charge costs about 15 cents at the US average price. Samebike publishes 1000 W and 45 km/h for it and assigns no class, so your state decides where you may ride it.

It suits riders of about 5'6" to 5'10" best, where the post reaches the formula height for most on at least one reading and 85 of 100 or more clear the top tube; under 5'6", check standover first, and from 6'0" up, your inseam. Through Shop Pay on our listing it comes to $126.27 a month for 12 months at 15% APR, subject to an eligibility check.

Before you order, send us your height, inseam and usual route. We will answer with your saddle and grip positions, your ride's watt-hours against the 816, and what the posted rules on your trails say about throttles.

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

This page goes out of date when any of these change: the price, specification, range figures or size-and-fit drawing on Samebike's US page for the RS-A08-II; Samebike's written answers on the post's lowest setting, the fork and rear shock fitted, the certificate, the delivered speed and power, or the load basis; the price, stock or Shop Pay terms on our listing; or a new month of EIA's residential electricity price.

Federal or recall news does the same: an amendment to 15 U.S.C. § 2085, a class published by Samebike for this model, or any 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.), RS-A08-II Off Road Peak 1500W Fat Tire Mountain Electric Bike — product page (Specifications table; feature panels; Size and Fit drawing and list; gallery; FAQ; policy block). Retrieved September 28, 2026. https://us.samebike.com/products/samebike-rsa08-off-road-electric-bike
2. SAMEBIKE US (Shopify product record), RS-A08-II — product record (.json) (variants[].price, compare_at_price, sku; images[]; created_at). Retrieved September 28, 2026. https://us.samebike.com/products/samebike-rsa08-off-road-electric-bike.json
3. Guangzhou Sameway Electric Bicycle Co., Ltd. (SAMEBIKE), Electric Mountain Bicycle — User Manual, Model: RS-A08 (English section) (1 Important note; 2 Unpacking and product specs (manual p. 4); 3 Product components; 4.3 Seat installation; 4.6 Removing the battery; 5.1 Charging method; 5.2 LCD Display; 6 Notes; 7 Warranty policy; back page). Retrieved September 28, 2026. https://cdn.shopify.com/s/files/1/0684/9173/9372/files/RS-A08-II.pdf?v=1781229859
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. SAMEBIKE EU, SAMEBIKE RS-A08-II Powerful All Terrain Mountain Electric Bicycle — product page (European store) (stat strip; motor panel; battery panel). Retrieved September 28, 2026. https://samebike.com/products/rsa08-ii-powerful-all-terrain-electric-bicycle
7. Guangzhou Sameway Electric Bicycle Co., Ltd. (SAMEBIKE), RS-A08 750W Hydraulic Brake Professional Mountain Electric Bike — product page (gzsamebike.com) (Description table (Battery; Hub Motor; Tires)). Retrieved September 28, 2026. https://www.gzsamebike.com/product/rs-a08-750w-hydraulic-brake-professional-mountain-electric-bike/
8. 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
9. 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
10. 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
11. 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
12. 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
13. 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/
14. 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
15. 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
16. Redtail eBikes, Samebike RS-A08 II Fat Tire Mountain Electric Bike — product listing (price, variants, Shop Pay installments block). Retrieved September 28, 2026. https://redtailebikes.com/products/samebike-rs-a08
17. Redtail eBikes, Shipping policy (Processing & delivery; Receiving & damage claims; Where we ship). Retrieved September 28, 2026. https://redtailebikes.com/policies/shipping-policy
18. Redtail eBikes, Refund policy (Change-of-mind returns; Order cancellations). Retrieved September 28, 2026. https://redtailebikes.com/policies/refund-policy
19. Redtail eBikes, Terms of service (delivery inspection paragraph). Retrieved September 28, 2026. https://redtailebikes.com/policies/terms-of-service
20. Affirm, Inc., Affirm's lending partners (lending partners page). Retrieved September 28, 2026. https://www.affirm.com/lenders
21. Kenda Tires, Krusade Sport — fat bike tire (Find a Tire) (size table (Part No., Size, ETRTO, PSI, TPI, Bead)). Retrieved September 28, 2026. https://bicycle.kendatire.com/en-us/find-a-tire/bicycle/fat-plus-tires/krusade-sport/
22. 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
23. 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
24. 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
25. 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
26. 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
27. 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
28. 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
29. 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
30. 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
31. Rothhamel M. On rolling resistance of bicycle tyres with ambient temperature in focus. International Journal of Vehicle Systems Modelling and Testing (Inderscience), volume 17, pages 67 to 80; Table 1 and Table 4 (2023). Retrieved September 23, 2026. https://www.inderscience.com/filter.php?aid=132317
32. Tengattini S, Bigazzi AY. Physical characteristics and resistance parameters of typical urban cyclists. Journal of Sports Sciences (Taylor & Francis), 36(20):2383-2391, Table 4 (2018). Retrieved September 23, 2026. https://civil-reactlab.sites.olt.ubc.ca/files/2022/11/Tengattini_2018_Physical-characteristics-and-resistance-parameters-of-typical-urban-cyclists.pdf
33. Arango I, Lopez C, Ceren A. Improving the Autonomy of a Mid-Drive Motor Electric Bicycle Based on System Efficiency Maps. World Electric Vehicle Journal (MDPI), 12(2):59, Eq. (40) (2021). Retrieved September 23, 2026. https://mdpi-res.com/d_attachment/wevj/wevj-12-00059/article_deploy/wevj-12-00059.pdf
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