Ridstar FM001 Review: Two Riders, One 330 lb Limit

20-inch step-through fat-tire e-bike with a rear seat, a backrest and footrests · one rear hub motor Ridstar rates at 1,000 W, "PEAK 1500W" · 48V 15Ah pack, 720 Wh by arithmetic · 330 lb load for rider, passenger and cargo together · riders 5'4" to 6'2" · sold out on our store at $654.35 on October 16, 2026 · verified October 16, 2026

Quick Answer — The Ridstar FM001 is a 20 × 4.0 fat-tire step-through with a rear seat, backrest and footrests, a 1,000 W hub motor and a 720 Wh pack. It is sold out on our store at $654.35. At a steady 15 mph on flat pavement, throttle only, a 180 lb rider computes to 43 miles; Ridstar prints 30 and 50.

On October 16, 2026 ridstar.net's own US variant read "Sold out" at $569 while its Canadian variant was in stock at $599, and ridstar.com offered the FM001 only with shipping to Canada. Before you wait for one, settle the 330 lb sum for the two of you (the second seat), the law on passengers where you ride (passenger law) and the bike that carries two today.

The maker's record, before you decide. Twice in 2026 the Consumer Product Safety Commission told owners of particular Ridstar models to stop riding them: 26-337 over the batteries and wires of the Q20 and Q20 Pro, and 26-584 over the front wheels of the Q20 and Q20 Lite. Neither names the FM001, the recall list held no Ridstar recall that day, and the record section shows where the FM001 meets the Q20 on Ridstar's parts pages.

What this review covers

Figures · What it is · Fit · Motor · Battery · Range · The second seat · Brakes and lights · Frame and suspension · The Mercer fit test · UL · Recalls · The maker's record · The Ridstar family · Class · Passenger law · Where to ride · Green and red flags · Verdict · Checklist · Buying · FAQ · Limitations · Bottom line · References

How we verified this Ridstar FM001 review

Every FM001 figure here was read on Ridstar's own pages on October 16, 2026, with the US market selected: ridstar.net's three FM001 listings, ridstar.com's one and their gallery panels, read at full size.

The dealer ridstar.eu's page, the CPSC record, the statutes, the court dockets and our own stock, checkout, freight and returns were read the same day. Every figure is held against Ridstar's published specification, and any figure that takes arithmetic is worked again here. We sell the FM001 when it is in stock, so its red flags get the same reading as its green ones. This review belongs to our e-bike reviews.

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

The FM001's figures, page by page

Ridstar's pages give the FM001 one motor rating with a peak, three top speeds, three range bands, one load limit, one rider window and no bike weight, and the table sets each reading beside the page that prints it. The second column is the figure this review plans on; the third and fourth quote Ridstar's two stores word for word.

Ridstar's studio photograph, the first image on all three ridstar.net FM001 listings and the machine on our cover.

Read October 16, 2026 from ridstar.net's FM001 listing and its five images, and from ridstar.com's FM001 listing and its six, both with the US market selected.

ridstar.net's technical table also lists "Brand Bopzin", "Brand Name Bopzin" and "Manufacturer Bopzin", with "Year 2023" and a "Color" row that reads "1000W". The same "Bopzin" rows sit in the table on Ridstar's DC26 listing, and the FAQ under the FM001 description on ridstar.net is headed "Q&A about Q20 Lite" while its fourth answer names the FM-001. Those are the pages as Ridstar published them.

Where Ridstar's pages disagree, this review prints each figure with its source and does not choose for you; where arithmetic needs one number, it names the number it runs and shows the others beside it.

Two Ridstar stores, one model: what the FM001 is

The FM001 is a 20-inch step-through fat-tire bike built to carry two: Ridstar calls it "ideal for parents who want to enjoy outdoor family time while carrying their children", and its three ridstar.net listings and one ridstar.com listing all title it a 2-seater. On October 16, 2026 none of them offered a US variant you could buy.

Prices and stock as each store printed them on October 16, 2026; ridstar.com's in its US-market dollars. ridstar.net's official statement calls every other similar website its dealer. Each listing's date is its creation date in the store's own product record.

ridstar.net's oldest FM001 listing carries both variants, the US one at $569 marked "Sold out" and the Canadian one at $599 marked "Many in stock", under a struck $1,099. Its variant labels are markets, and the page does not say whether a Canadian variant can be shipped to an American address.

ridstar.com's listing has one variant, named "Canada", and its shipping box reads "Free shipping to: Canada". The dealer ridstar.eu prints "IN STOCK in EU warehouse" above an "Out of stock" button and says the FM001's "Max speed can be limited to 25 km/h for full EU road compliance."

Ridstar's own seat image, the fourth on its ridstar.net listings: the only place Ridstar prints a figure for the passenger's side of the bike, "Backrest Max Weight:170 LBS".

The rear seat is a separate cushion on the rack, with a grab loop at its front edge and a backrest on a post behind it. Ridstar's text calls the seat, backrest and footrest "removable", and its seat image lists "Removable Backrest" and "Footrest for Comfortable Seating", so you can run it as a one-seater with a rack when your passenger stays home.

ridstar.net also sells spare parts with an FM001 option, each shown in stock on October 16, 2026: a controller at $89, an LCD display at $69, a charger at $69, a throttle at $59, a seat at $89, a front fork at $159 and a rear hub "contains motor" at $379. The battery section prices the pack, and the maker's record shows which of those listings also carry the Q20.

Who the FM001 fits: Ridstar's 5'4" to 6'2" window

Seat a median 5'6" rider from the US Army's ANSUR II survey at 109% of inseam counted from the pedal axle, and the saddle top sits 34.5 inches above the pedal; a median 6'0" rider needs 38.1 inches. Ridstar prints one fit figure for the FM001, a rider window, and in the same survey people of one height differ by about three inches of inseam, so a window alone cannot place your leg.

Ridstar's two stores write the window two ways: ridstar.com's slider says "5'4" -6'2"", and ridstar.net's FAQ says "5.4 to 6.2 feet". This review reads both as 5'4" to 6'2"; taken as decimal feet, ridstar.net's would run from 5'4.8" to 6'2.4".

Work out your own figure in three steps:

1. Stand in socks with your back to a wall, press a hardcover book up between your legs like a saddle, and measure from its top edge to the floor.
2. Look up your height in the saddle table; the row gives the pedal-to-saddle distance that suits an inseam like yours.
3. Set the saddle with the heel check in the setup subsection, then aim for 25 to 35 degrees of knee bend.

Ridstar publishes no geometry for the FM001: its four listings, their technical table and their gallery images give no seat height, saddle range, standover, reach or crank length, and the dealer's page gives none either. So the model prints the formula and the window, and it computes no lean, hand load or clearance for a frame whose dimensions nobody prints.

Will the FM001's saddle go high enough for me?

This table puts the saddle top 109% of an inseam above the pedal axle, the setting Peveler et al. (2005) weighed against the heel method. Ferrer-Roca et al. (2012) recommend anything from 106% to 109% and derive 108.6% to 110.4% from their equation, which is why the two outer columns read 106% and 110.4%.

Each inseam band holds the middle 90% of the 6,068 bodies the US Army's ANSUR II survey measured, sorted by height. With no saddle range from Ridstar for the FM001, the table can place your saddle by formula but cannot say whether the FM001's seat post extends that far.

The formula saddle table. Each band is the middle 90% of the ANSUR II bodies of that height, with no band built on fewer than 30. Peveler et al. give the 109% column, and Ferrer-Roca's two ranges supply the outer columns at 106% and 110.4%. LeMond's 88.3% rule needs a crank length, and with none from Ridstar that column is left out.

Can I put a foot down at a stop?

No standover height appears on any FM001 page, so how much room your legs have over the frame cannot be computed. The step-through frame in Ridstar's studio photograph drops low between the seat tube and the head tube, and for scale, the middle 90% of 5'6" bodies in the Army survey run from 30.2 to 33.5 inches of inseam.

With a passenger behind you, both your feet carry the stop. Measure the frame's lowest point on the bike you would receive before you count on a flat-footed stop; the email offer above covers it.

Will you sit stretched or cramped on the FM001?

No lean is computed, because Ridstar publishes no grip position, reach or seat angle for the FM001. Its studio photograph shows a tall loop handlebar swept back toward the seat, and its four-panel image labels an "Ajustahle Saddle" (sic) with no range. If you can, sit on one before buying; otherwise send your arm length with the email offer above and we will add it.

How much weight goes through your wrists?

Hand load depends on where the grips sit, and Ridstar publishes no grip position for the FM001, so no hand load is computed. The one measured reference this page cites is about 15% of body weight through the stem, from Carahalios (2015) on ten road racers with their hands on the hoods; it is a racer's ceiling with the torso forward, and no FM001 figure is computed from it.

How do you set the saddle when it arrives?

Ridstar's listings sell a single frame size on 20 × 4.0 tires for riders from 5'4" to 6'2", which leaves all the fitting to the seat post on unboxing day.

Begin with the heel check: put your heel on the lower pedal with the crank lined up along the seat tube, then lock your knee straight. Hips that rock side to side, or a leg that will not reach straight, mean the saddle is set too high.

After that, ride on the ball of your foot and check for a knee bent 25 to 35 degrees when the pedal is lowest, the range set out by Peveler, Pounders and Bishop (2007) and Ferrer-Roca et al. (2012). Two riders of one height can need different settings, so the formula is the first guess and your knee is the judge.

The fit arithmetic, step by step

For every body in ANSUR II, the model takes 109%, 106% and 110.4% of the inseam and reports each as a saddle height above the pedal axle. Take a 68-inch rider: the median inseam at that height comes out at 32.6 inches; 109% of it puts the saddle 35.6 inches above the pedal axle, 106% puts it at 34.6 inches and 110.4% at 36.0 inches.

The 109% setting sits within what Peveler et al. (2005) found, 109.2 ± 0.9%. Ridstar prints no saddle range to check the output against, and nothing about the rear seat's height or the footrests' position for your passenger, so neither is computed; Limitations records both.

One rear hub motor, 1,000 W with a 1,500 W peak

Ridstar rates the FM001's rear hub motor at 1,000 W with a 1,500 W peak and 85 N·m of torque, enough by its own text for "steep slopes up to 35°". The motor sits in the rear wheel, the one under your passenger's seat.

Ridstar's motor image, the second on its ridstar.net listings. Its "30mph" and "30°" sit beside a text that says "28+++ mph" and "35°".

ridstar.net's text calls it "a powerful 1000W(PEAK 1500W) brushless motor, reaching speeds up to 28+++ mph with a torque of 85nm", and its spec list says "Motor : 1000W Motor(PEAK 1500W)". ridstar.com's slider prints "1000W" and "Max Speed 20MPH", and its comparison chart repeats 20MPH beside the YVY K20 Lite.

Three modes are printed on Ridstar's lifestyle image: "BIKE MODE", "Power off, normal biking just pedaling"; "ASSISTED RIDING", "Power on without throttle"; and "THROTTLE MODE", "Just throttle no need to pedal". ridstar.net sells a "Turning Handle Throttle (two keys included)" with an FM-001 option for $59, a twist grip.

One owner's speedometer and phone disagreed. In a post on Reddit's r/ebikes of April 16, 2025, an FM001 owner wrote that "the bike said it goes 30mph and thats what the speedometer said but gmaps said its goes 25mph with only me on it", and that they were "looking for a torque bar to stop my axel spin".

That is one person's account, quoted as theirs. The range model, with its motor set to free-spin at Ridstar's 30 mph, holds 26.3 mph on the flat with a 180 lb rider, 1.3 mph above that phone's 25. A spinning axle is a hub-motor fault worth knowing about: check your rear axle nuts and torque washers before every ride with a passenger.

A 48V 15Ah pack, 720 Wh by arithmetic

The FM001 runs on a removable 48V 15Ah lithium-ion pack, 720 Wh by multiplying Ridstar's own volts and amp-hours, which Ridstar says charges in "4-6 hours at 3A". Ridstar prints no watt-hour figure, no cell maker and no cell format for it.

ridstar.com's battery image for the FM001, printing the third range band, "25-45 Miles", and the word "Lockable".

ridstar.net's text says "The certified battery incorporates BMS security protection and power-saving capabilities." The sentence names no certificate, no standard and no file number, and the UL section sets out what to ask a seller for.

At the residential average of 18.31 cents per kWh that the US Energy Information Administration gives for July 2026, a full 720 Wh charge costs about 13 cents before the charger's own losses. At the model's 16.8 Wh a mile for 15 mph on throttle alone, 1,000 miles a year comes to about $3 of electricity.

A spare pack is sold by ridstar.net as an "FM-001" option at $379 on its Q20/DC26/H20 battery listing, in stock on October 16, 2026, and the matching charger as an FM001 option at $69. Which other models share that listing is a question for the record section, and the answer matters for a battery.

Range: 43 miles at 15 mph for one rider, 34 at the 330 lb limit

From a full 720 Wh pack on level pavement, the model gives a 180 lb rider on the FM001 43 miles at a steady 15 mph on throttle alone, 30 miles at 20 mph, and 67 miles at 15 mph with easy pedaling. Load it to Ridstar's 330 lb limit, you and your passenger together, and the 15 mph figure falls to 34 miles.

On throttle alone, each 1,000 feet of climbing costs about 144 Wh at a 4% grade and 193 Wh at 10%.

Your own ride's figure takes three steps:

1. Choose a cruising speed and a pedaling effort in the speed tables.
2. Add the weight of you, your passenger and the basket in the load rows, then the climbing in the hill rows.
3. Adjust for the season and plan on the column that leaves a quarter of the pack unused.

Every figure here comes from one steady-state model built on Ridstar's own FM001 figures, a comparable motor's published curve, drum-measured fat-tire rolling resistance and a peer-reviewed cycling-power equation, and the formula subsection takes one ride through it line by line.

How much range does the Ridstar FM001 have?

For a 180 lb rider on throttle alone over level pavement, a full pack lasts a computed 60 miles at 10 mph, 43 at 15 mph and 30 at 20 mph; add 150 W of steady pedaling at 15 mph and it reaches 141 miles. Below, one table sets every speed beside the figure to plan on, and the next shows the miles your pedaling adds.

Miles on a full 720 Wh pack, flat pavement, 180 lb rider, a 66.0 lb bike, 77 °F, tires at the median rolling resistance of ten fat-tire tests. The last column keeps 25% in the pack, the share Schmitt, Decker and Doppelbauer (2019) found unused when a measured pedelec drew 75% of its nominal capacity; Ridstar's FM001 pages state no reserve.

Full-pack miles at each effort, flat pavement, 180 lb rider, 66.0 lb bike. Easy pedaling means 75 W from the rider and steady pedaling 150 W; the throttle-only column is the speed table again.

Ridstar's pages print three top speeds: "28+++ mph" in ridstar.net's text, "30mph" on its motor image and "Max Speed 20MPH" on ridstar.com's slider. The 30 mph figure fixes the model motor's free-spinning speed; loaded with a 180 lb rider on the flat, the bike tops out at 26.3 mph, so the tables end at 25 mph, a speed at which a full pack lasts 21 miles on throttle alone.

With the motor off, 75 W of pedaling moves a 180 lb rider on this bike at about 9.2 mph on the flat and 150 W at about 13.2 mph, which is why the effort table starts at 15 mph.

What gears does the Ridstar FM001 have?

ridstar.net's technical table lists "Number of Speeds 7", and because the motor sits in the rear hub, the cog you pick sets your cadence and how much your legs add, while the pack's draw follows your speed, the load, the grade and your watts. ridstar.net also sells a rear derailleur and a chain with FM001 options, at $59 each.

The lifestyle image on ridstar.net names the three ways to ride it, pedaling with the power off, assisted pedaling "without throttle", and throttle alone, and ridstar.net's text lists a "PAS" readout on the display without counting the levels. The table shows what each effort asks of the pack on the same ride; it is not a gear chart.

Watt-hours a mile from the pack on the flat and on two grades, 180 lb rider, 66.0 lb bike, at three efforts. Its two 12 mph rows climb a 4% and an 8% grade at an easy pace.

What a climb costs the pack

Climbing 1,000 feet on throttle alone draws about 144 Wh at a 4% grade, 158 Wh at 6%, 174 Wh at 8% and 193 Wh at 10%; at a steady 10 mph, one mile uses 26 Wh at 2% and 224 Wh at 15%. Easy pedaling trims each 1,000 feet to between 125 and 168 Wh over the same grades.

Full-pack miles by grade at a steady 10 mph, 180 lb rider, 66.0 lb bike, on throttle alone and with easy pedaling, grades from 2% to 15%.

Ridstar's slope figures sit far past this table: "steep slopes up to 35°" in ridstar.net's text and "30°" on its motor image. A 35° slope is a 70% grade and 30° is 58%, and neither figure comes with a speed or a load. The model checks each row against the 1,000 W rating and the "85nm" Ridstar prints, and all fourteen rows pass.

The current is the tighter limit. Riding a 10% grade at 10 mph on throttle alone needs 37.0 N·m from the motor, 572 W at the wheel and roughly 37 A from the pack; a 15% grade needs 52.5 N·m, 810 W and roughly 52 A.

Divided by 48 V, the 1,000 W rating comes to roughly 21 A and the 1,500 W peak to roughly 31 A. No Ridstar page prints the controller's current limit, so a controller that caps current would climb those grades slower.

What is the FM001's weight limit with a passenger?

Ridstar's limit is "Max Load : 330lbs" for rider, passenger and cargo together, and at that load a full pack covers 34 miles at 15 mph on the flat, against 43 miles for a 180 lb rider alone; an 8% climb at 10 mph drops from 8 miles to 4. To the battery a passenger is load like any other, so total your weight, your passenger's and the basket's, then read the row.

Rider plus passenger plus cargo, 66.0 lb bike, throttle alone, flat pavement unless the column says climb. The bottom row is ridstar.net's "Max Load : 330lbs"; the second-seat section sets average body weights against it.

Ridstar prints no weight for the FM001 itself. The model runs on 66.0 lb, the weight field in Ridstar's own product feed for the FM001's variants, and checks a heavier bike at 81.6 lb, the weight Ridstar prints for its MN26 step-through with a basket and rack: 15.6 lb more takes about a mile off the 15 mph figure.

The two bike weights the model runs, 180 lb rider, throttle alone. Every other table on this page runs on the 66.0 lb row.

Range in the cold

Cold shortens the ride: at 32 °F a 180 lb rider gets a computed 34 miles at 15 mph on throttle alone, bracketed 30 to 36, and at 14 °F 31 miles, bracketed 15 to 31. Ridstar names no cell maker or format for the FM001's pack, so the energy column comes from published temperature data for an LG HG2 lithium-ion cell.

Air temperature, the pack's energy against 77 °F, and the 15 mph flat range on throttle alone, 180 lb rider, 66.0 lb bike. The brackets are the spread in the cell data, starting at 32 °F; by 14 °F the pack keeps between 40% and 83% of its energy.

Warm air adds miles in the model. Each degree Celsius of warmth cuts rolling resistance by about 0.9%, a value between the 0.88% of Bicycle Rolling Resistance's temperature test and the 0.97% of Rothhämel (2023) that the model holds steady below 41 °F; that is why a 95 °F ride goes farther than a 77 °F one although the pack holds 99%.

Fat tires and how you sit

Ten fat tires measured on a drum put the FM001's 15 mph throttle-only range anywhere from 40 to 49 miles, 43 at the median. The model runs that median coefficient, 0.0105 from ten fat-tire tests, with the lowest tire's 0.0070 and the highest's 0.0126 as its bracket. Ridstar calls the FM001's tires "puncture-resistant" and names no maker or pressure.

Your riding position is the other half. The model takes a drag area of 0.640 m², the drag coefficient times frontal area, for upright cruiser riders in Tengattini and Bigazzi (2018); sit like that study's everyday mountain-bike riders, at 0.603 m², and your 15 mph figure rises to 44 miles. A passenger behind you adds frontal area the model does not count.

Rolling resistance as the drum measured it, with the 15 mph and 20 mph flat ranges on throttle alone, 180 lb rider, 66.0 lb bike. All rows assume pavement; the model does not cover sand, snow or loose gravel.

How many miles does Ridstar say the FM001 goes?

Ridstar's two stores print three range bands for the FM001, 30 miles "pure ebike mode", 50 miles "assist mode" and "25-45 Miles" on a battery image, and the model ties each figure to a steady ride on the flat.

The 30 miles both spec lists give pure electric riding asks for 20.0 mph on throttle alone, the same figure as the top speed ridstar.com prints; the 50 they give assisted riding asks for 12.9 mph on throttle alone or 17.3 mph with 75 W of easy pedaling. The battery image's 45 asks for 14.4 mph on the motor alone, and its 25 for 22.5 mph.

The steady flat-pavement speed at which the model reaches each of Ridstar's range figures on a full 720 Wh pack, 180 lb rider, 66.0 lb bike, at three efforts: Easy is 75 W of pedaling and Steady 150 W. Sources: the two spec lists, ridstar.com's comparison chart and its battery image.

Ridstar attaches no rider weight, passenger or terrain to any of its figures. Put a passenger behind you and every speed in the table drops for the same mileage, which is why the load rows are the ones to plan your two-up rides on.

How the range figures are computed

The wheel's power goes into three forces, rolling resistance, gravity on a climb and air drag, and the motor and the battery each waste a share before it gets there. Martin and colleagues (1998) supply the equation: add the three forces, multiply by speed, then divide by the efficiencies of the drivetrain, the motor and the battery.

Every input in the table names its source; a number missing from the table never reaches the model.

Rows hold a Ridstar or study figure, a bracketed comparable, or a physical constant, each value copied from the model's own provenance block. Sources are in the references.

One 15 mph ride, worked through the arithmetic. Take a 180 lb rider on the 66.0 lb bike, flat pavement, throttle only: rolling resistance costs 77.3 W and drag 114.2 W, so the wheel needs 191.6 W. The motor is about 79% efficient at that load, so 243.0 W leaves the battery's terminals, and after the battery's own losses the cells supply 251.6 W.

That works out to 16.8 Wh a mile: 42.9 miles from 720 Wh, or 32.2 miles if you plan to keep a quarter of the pack.

Fed the worked example from Martin and colleagues' Appendix I, the model reproduces the paper's printed 45.7 W for the rolling and potential terms and 158.8 W for the aerodynamic term. Its comparable motor gives 80% efficiency at its rated point, the floor the Bafang workbook publishes; no measured FM001 ride with its rider weight and speed stated was found to check the output, the gap Limitations records.

Change the motor assumption and the 15 mph figure lands between 42 and 46 miles. Rate the motor at the 1,500 W Ridstar gives as its peak and the 15 mph ride returns 42 miles and the 8% climb 10; rate it at 750 W and they return 43 and 8, and at 82% efficiency 46 and 9. All four cases share every other input, none of them is a measurement, and the tables sit inside their spread.

The second seat: a backrest, footrests and one 330 lb limit

Ridstar sells the FM001 with a removable rear seat, a backrest and a footrest, "suitable for children even adult riders", and prints one load for the whole bike, "Max Load : 330lbs", and one for the backrest, "Backrest Max Weight:170 LBS". Every pound of rider, passenger and cargo comes out of the 330.

A crop of Ridstar's studio photograph: the passenger's cushion, grab loop and backrest. Ridstar prints no seat height or footrest position for your passenger.

The national averages show how quickly two people use up 330 lb. In the CDC's survey of 2015 to 2018, the average American man weighed 199.8 lb and the average woman 170.8 lb, so the average pair weighs 370.6 lb, 40.6 lb over the FM001's limit before a bag goes in the basket.

Mean weights from NCHS Vital and Health Statistics Series 3, No. 46, Tables 2, 4 and 6: adults aged 20 and over, children by age at examination, measured 2015 to 2018. Your own scale outranks any row.

An average-weight man leaves 130.2 lb under the limit for your passenger and everything else, enough for the average child of 12 and short of the average 13-year-old boy.

The average woman, at 170.8 lb, would also sit 0.8 lb over the backrest's printed 170 lb if that figure is meant as your passenger's limit. Ridstar's image does not say what the 170 lb applies to, so ask before you load an adult.

Ridstar's own sentences point the FM001 at children: the bike "is ideal for parents who want to enjoy outdoor family time while carrying their children", and ridstar.com adds "bring a kid, friend or partner along for rides". ridstar.net's policy text says "Underage riders MUST be accompanied by parents or adults when riding", and the passenger-law section quotes the seat, footrest and helmet rules that come with a child behind you.

There is no FM001 weight to lift on Ridstar's pages: none of the four listings, the technical table or the gallery prints one. Before you plan a car rack or a stair, ask for the weighed figure; the range model's 66.0 lb is a feed field, not a printed weight.

Mechanical discs, lights and a color display

ridstar.net's spec list says "Brake : Mechanical Disc Brakes", and its text describes "a reliable dual mechanical disc brake system"; neither store names a brake maker or a rotor size. ridstar.net sells the FM001's brake set as left-front and right-rear options at $90 each, and its brake pads at $35 a pair.

Ridstar's four-panel image, the last on its ridstar.net listings: the display, the headlight, the front tire and disc, and the saddle.

The lights are "waterproof headlights and brake lights", in ridstar.net's words, and the display shows "speed, mileage, battery level, PAS, and other essential information". The technical table adds a "USB Charging Port" and a "Phone Holder" among its special features, and the text claims "IP5 waterproof protection" (sic), a rating with no second digit.

With a passenger aboard, the brakes stop both of you. If you want hydraulic brakes for two-up riding, the VTUVIA SF20H lists "Dual LOGAN Hydraulic Disc Brakes" on 180 mm rotors on VTUVIA's page, and our SF20H review works its range and fit.

Frame, suspension and tires

Ridstar's technical table says "Frame Material Aluminum" and "Suspension Type Dual", and its text says the "front & seat suspension fork is strengthened by 100%"; the dealer ridstar.eu describes "a high-strength steel frame and front fork suspension". The studio photograph shows a sprung front fork with a silver stanchion and a coil shock below the saddle.

A crop of Ridstar's studio photograph: the front basket, headlight and fork. ridstar.net's seat image says the basket "Can Upgrade".

The tires are 20 × 4.0 fat tires that ridstar.net calls "puncture-resistant" for "grass, dirt, sand, snow, and gravel surfaces". ridstar.net sells an outer tire with an FM001 option at $159 and an inner tube at $59, and a front fork at $159.

A crop of Ridstar's studio photograph: the rear wheel, which carries the motor, with its disc and the kickstand.

The steel-or-aluminum question is not one you can settle from the record. Ridstar's own table says aluminum and the dealer's page says steel, and neither prints a frame weight; the email offer is the way to get the frame stated in writing for the unit you would receive.

The Mercer fit test

Seven members of the Mercer family, the same archetypes every review uses, are set against the FM001 here. Each row reads Ridstar's 5'4" to 6'2" window, the formula's saddle distance at that height and the law in the class section; because the FM001 carries two, the last two rows also read the bike as your passenger would meet it. The family are archetypes, never testers.

The people are the Mercer family. Heights and ages are theirs; the saddle figures are 109% of the median inseam at each height in the ANSUR II survey, and the passenger weights are the CDC's 2015 to 2018 means.

On the FM001 the window seats all five adults and the 330 lb limit sorts the pairs. Frank, Ruth, Jack, Dana and Maya sit inside Ridstar's 5'4" to 6'2", but if two of them weighed the national averages for a man and a woman, 370.6 lb together, they would be 40.6 lb past the limit before a bag went in the basket.

Dana with Ivy behind her is the trip Ridstar's own sentences describe, "carrying their children", and the averages for a woman and a girl of 12 total 287.7 lb, under the line. Cole is 16, and at the CDC's 157.2 lb mean for a boy his age, he and an average-weight man come to 357.0 lb, so carrying him is over the limit too.

Cole is 16 and Ivy is 12, and neither should ride the FM001 alone. Its 1,000 W motor sits above the 750-watt limb in 44 of the 51 state definitions (the class section has them), so the e-bike rules of those states, age limits among them, do not reach it.

Ridstar's policy text adds "Underage riders MUST be accompanied by parents or adults when riding." If either rides behind you, the passenger-law section sets out the seat, footrest and helmet rules that apply.

Is the Ridstar FM001 UL certified?

No UL mark, UL standard or file number appears on any of Ridstar's four FM001 pages, its gallery or the dealer's page; ridstar.net's text says "The certified battery incorporates BMS security protection" and names no certificate, standard or holder. Sales copy states a claim; a certificate is a record you can look up yourself.

Under UL Solutions' e-bike program, UL 2849 judges the drive train, battery and charger together as a single electrical system. Ask any seller for the certificate holder's name and file number before you pay; VTUVIA's SF20H page prints "UL2271 & UL2849 Safety Certified", and the same questions apply there.

What the "Our Qualifications" links under the FM001 open. The footer under ridstar.net's FM001 listing links a "US trademark", a "CE trademark" and a "European trademark". Two of them, the first and the last, register the word "Ridstar": in the United States as registration 6,936,242 on December 27, 2022, and in the EU as registration 018609888 on March 16, 2022.

Behind the "CE trademark" link is a test report to EN 15194:2017, issued April 2, 2024, for a "Cargo electric bicycle", model "FM-002, CDDA20", rated "250W" at maximum power. Its model number sits one digit from the FM001's, and no Ridstar page connects the two machines; none of the three documents names the FM001, and none is a UL document.

Has the Ridstar FM001 been recalled?

No. The CPSC's recall list carried no Ridstar recall on October 16, 2026, and its two Ridstar warnings name the Q20, the Q20 Pro and the Q20 Lite, never the FM001.

The full recall list that day held 10,053 records, the newest dated October 15, 2026, and none named Ridstar, its maker, YVY or the FM001 under any of its spellings, FM-001 and MF001 included. The Commission's recall feed, 40 items from September 17 to October 15, held none either, and its warning list of 375 rows carries the two Ridstar warnings and no FM001 row.

Because a warning is not a recall, no Ridstar bike has a recall remedy. Search the CPSC's recall list again the week you order, and see the maker's record for both warnings in full.

The maker's record

Two CPSC stop-use warnings, a UK safety report and two lawsuits concern Ridstar bikes, none of them names the FM001, and Ridstar's own parts pages sell the FM001's battery and front axles on the same listings as the warned Q20's. This is the company's record rather than the bike's, so it is told here in the words of the regulators, the courts and the owners themselves.

Each row quotes the Commission's release as printed, re-read word for word on October 16, 2026.

The manufacturer named in each release is Huizhou Xingqishi Sporting Goods Co., Ltd., of China. The fire release says the company "has refused to agree to an acceptable recall" and records "The company objects to this press release"; the crash release says it "has been unresponsive to CPSC's requests for information about these products or a recall."

Where the FM001 meets the Q20 on Ridstar's own pages. ridstar.net sells the FM001's spare pack as an "FM-001" option, $379, on its "Q20/DC26/H20 48V 20AH 15AH Removable Electric E-Bike Battery" listing, whose Q20 option is $399. Its two front-axle listings, "Through shaft" and "Active axis", each carry an FM001 option and a Q20 option at $35.

No Ridstar page says whether those options are the same parts. The fire warning concerns the Q20's "batteries and wires" and the crash warning its "front wheel", so those are the two questions to put to any seller in writing. ridstar.net's FM001 listing opens with two notes of its own: "Non-professionals please do not adjust the controller circuit！！！" and "Note: Front tires must be securely installed, Self-modification may posesafety risks." (sic).

Ridstar's lifestyle image, the third on its ridstar.net listings, with its three riding modes printed down the side.

To spot a warned bike, both releases point you to the color, black, the line "the brand name Ridstar is printed on the battery", and the model number "on the purchase receipt". The FM001 in Ridstar's photographs is black with Ridstar on its battery, so neither marking sets it apart; the model number on the receipt does. Neither release lists redtailebikes.com among the places the warned bikes were sold.

Britain keeps its own file. On June 19, 2025 its Office for Product Safety and Standards named Ridstar's "Q20-Plus, Q20-Mini, E26 Pro and Chargers" a serious fire risk because "the charger has poor quality soldering, and the transformer does not meet the minimum requirements for creepage and clearance distances"; that shipment "has been rejected at the border," and the FM001 is not in the report.

In two federal product-liability cases, plaintiffs allege that a Ridstar front wheel came off. The Oregon suit against Amazon, No. 3:26-cv-00692, concerns a "Ridstar Q20"; the Florida suit against Walmart, No. 9:26-cv-81045, concerns a bike titled "Peak 1500W30MPH,48V 15.6Ah". Both are allegations, Ridstar is a named defendant in neither, and on October 16, 2026 neither docket showed a ruling.

Owners' accounts of the FM001. ridstar.net's FM001 page rates the bike 5 out of 5 from 8 reviews in its structured data, which carries the text of three. One, from a buyer named there as Jose Zuniga and scored five stars, reads: "After one charge it would not turn on again. I have reached out to customer service and have yet to hear back from them." ridstar.com's listing shows "No reviews".

On Reddit, the r/ebikes owner quoted in the motor section went looking for "a torque bar to stop my axel spin". Each is one person's account of one bike, quoted as theirs and never totaled.

Who would you be buying from?

ridstar.net's company page gives the business as "HK RIDSTAR TRADE LIMITED", at an address in Hung Hom, Hong Kong, while the FM001 listing on the same store says "Established in New Jersey and proudly serving the US since 2008." YVY's company page names the same business, so YVY and Ridstar bikes come from one company.

The US trademark names its owner as "Huizhoushi Xingqishi Sports Goods Co., Ltd.", and the FM001's technical table on ridstar.net lists "Manufacturer Bopzin". The table also gives "Brand Bopzin", a third name beside Ridstar and YVY, and none of the FM001 pages explains it.

Which Ridstar store would you be buying from?

On October 16, 2026 neither of Ridstar's own stores offered the FM001 for US delivery. ridstar.net's statement reads "Except ridstar.net, other similar websites are our dealers" and "we will not provide any after-sales service to customers who purchase ridstar products from other places", and its US variant read "Sold out".

ridstar.com's FM001 page says "The Ridstar Warranty Policy is only available to customers ordering from ridstar.com" and ships its one variant to Canada. Buying it from us sets out what those statements mean for a Ridstar bike bought here.

The FM001 in Ridstar's line

The FM001 is Ridstar's 2-seater, and ridstar.com's own comparison chart sets it beside the YVY K20 Lite, printing the same "1000W", "48V 15AH", "20MPH" and "30 Miles(Throttle)/50 Miles(Assist Mode)" for both. The chart lists the K20 Lite at $1,079.00 and the FM001 at $1,129.00 in ridstar.com's US-market dollars.

We review eight other Ridstar bikes, and each page reads its maker's figures the way this one does:

• The MN26, Ridstar's 26-inch step-through with a basket and rack: our Ridstar MN26 review.
• The Q20, the one model both CPSC warnings name: our Ridstar Q20 review.
• The Q20 Pro, named in the fire warning: our Ridstar Q20 Pro review.
• The Q20 Lite, named in the crash warning: our Ridstar Q20 Lite review.
• The Q30 Pro, a two-motor bike named in neither: our Ridstar Q30 Pro review.
• The Q50, named in neither: our Ridstar Q50 review.
• The H26 Pro, the folding 26-inch model: our Ridstar H26 Pro review.
• The Q30 Lite, which ridstar.com sells as the Q50 Lite: our Ridstar Q30 Lite review.

Our Ridstar profile covers the company itself, its stores, both warnings and both suits, while our e-bike reviews set the FM001 next to bikes from other makers.

A 1,000 W motor against the e-bike classes

At 1,000 W, with a 1,500 W peak, the FM001's motor is over the 750-watt line drawn by 44 of the 51 state definitions, and Ridstar's pages give it no class. Read the definition your own state writes before the FM001's first ride on a public road, lane or path, with or without a passenger.

Federal law draws the line in 15 U.S.C. § 2085(b): a low-speed electric bicycle needs "fully operable pedals", a motor "of less than 750 watts (1 h.p.)", and a top speed on the motor alone, with a 170-pound rider aboard, that "is less than 20 mph."

Both statutes as govinfo and California's legislative site printed them on October 16, 2026, the day Ridstar's figures were read from its FM001 listings.

California's § 312.5(a) admits only a motor that "does not exceed 750 watts of power", so at Ridstar's 1,000 W the FM001 falls outside the state's electric bicycle definition.

California's moped definition, § 406(a), asks for "fully operative pedals for propulsion by human power", "an automatic transmission and a motor that produces less than 4 gross brake horsepower", and a top speed "of not more than 30 miles per hour on level ground".

1,000 W is about 1.3 horsepower and 1,500 W about 2.0. Ridstar's 20 and 30 mph figures sit at or under 30, and ridstar.eu's "50 km/h", about 31 mph, sits over it.

ridstar.net's technical table lists "Number of Speeds 7", and whether a derailleur gearbox is "an automatic transmission" is a question for the California Department of Motor Vehicles and our California page; this review does not decide it for you.

Reading all 51 definitions, the 50 states and DC, on September 24, 2026, our census counted 44 that set a 750-watt motor limb. Rhode Island's counts horsepower instead, a motor "rated not more than two (2) (S.A.E.) horsepower", about 1,491 W, on a bike "capable of a maximum speed of not more than twenty-eight miles per hour".

Run through our 51-jurisdiction screen at 1,000 W, the FM001 sits inside the e-bike definition in four places, the District, Montana, Oregon and Rhode Island, and only at ridstar.com's 20 mph; at the 28 or 30 mph ridstar.net prints, it sits inside none. New Jersey's definition admits no throttle under P.L.2025, c.285, and Alaska and Kentucky have no electric bicycle definition.

ridstar.eu says the FM001's "Max speed can be limited to 25 km/h for full EU road compliance", which is Europe's rule and not a US class, and no Ridstar store prints how to set a 20 mph limit. Our 50-state atlas quotes each state's line from its statute.

Carrying a passenger: what the law asks

Which passenger rule governs the FM001 depends on what your state calls a 1,000 W bike: where it is a bicycle, the bicycle passenger rule applies; where it is a moped or motorized bicycle, that vehicle's rule does, and California writes both. Ridstar's pages print no passenger rule of their own beyond "Underage riders MUST be accompanied by parents or adults when riding."

Each section as California's legislative site printed it on October 16, 2026. At 1,000 W the FM001 falls outside the bicycle row's electric-bicycle definition, § 312.5; the row is there in case your bike is limited to a class.

The FM001's passenger kit is the hardware § 27800 names: a rear seat behind the driver and a footrest. § 27800 also requires that "Every passenger on a motorcycle or a motorized bicycle shall keep his feet on the footrests while such vehicle is in motion", so the footrests are not optional on that reading, and the seat has to be "securely fastened", a check to make before every ride.

California has already widened the bicycle rule once. AB 1614, approved by the Governor on June 30, 2026 as Chapter 40, Statutes of 2026, extends § 21204's separate-seat rule from "a highway" to "a highway or a Class I bikeway". It is not an urgency measure, so under article IV, section 8(c)(1) it takes effect on January 1, 2027.

Where Ridstar's 20 mph figure makes the FM001 an e-bike, the four bicycle passenger rules read this way:

The District's rule is quoted from our deposit of September 15, 2026; its page read on October 16 lists the same rule's most recent version as effective December 9, 2022. Montana's Part 6 was read section by section on October 2, 2026, and its index again on October 16.

Ridstar titles the FM001 a "2-Seater" and sells it with the seat and footrest to match, which is what those three "designed or equipped" rules ask about; whether a removable seat counts is your state's call. In the other 45 jurisdictions at 20 mph, and in all 49 with a definition at 28 or 30 mph, the FM001 is regulated as whatever else your state's code calls it, and that vehicle's passenger rule applies.

Where you can ride it

Where a path lets e-bikes in by class, the FM001 gets in only if the posted wording covers a bike with no class, which is what Ridstar's pages leave it. Read as a motorized bicycle in California, it is kept off "a bicycle path or trail, bikeway, bicycle lane" by § 21207.5(a), except where the path is "within or adjacent to a roadway" or a local ordinance permits it.

Start from the posted wording of each rulebook; the watts and the top speed only count once that wording mentions them.

National Forests use 36 CFR 261.2's definition of a motor vehicle, "any vehicle which is self-propelled, other than" one on rails or a wheelchair or mobility device, and under 36 CFR 261.1b a broken Part 261 rule can bring "imprisonment of not more than six months or a fine in accordance with" the federal criminal code.

Ridstar's fat-tire pitch names "snow, beach, mountain, and city roads", and the agency that runs the beach or trail you have in mind decides whether a 1,000 W bike with a passenger may use it. Our public-land guide takes the agencies one by one: the Forest Service, the Bureau of Land Management, the National Park Service, wildlife refuges and Army Corps lakes.

Green flags / Red flags

Every green flag below can be checked on Ridstar's pages or ours, and every red flag closes with something you can do before buying or riding.

Green flags

• A seat, a backrest and a footrest for a second rider, all removable. ridstar.net lists the "removable rear seat, backrest, and footrest", and its seat image adds "Footrest for Comfortable Seating".
• 720 Wh of battery for $654.35. About $0.91 per watt-hour at our price when in stock, against $1.93 for the VTUVIA SF20H and $1.49 for the Qiolor Tiger Plus on our store.
• A rear hub motor rated 1,000 W with a 1,500 W peak and 85 N·m. On throttle alone the model climbs every hill row, up to a 15% grade at 10 mph, within the 1,000 W rating and the 85 N·m Ridstar prints.
• The everyday parts come fitted. A front basket, a headlight and brake light, a color display, a USB charging port and a phone holder, in ridstar.net's text and technical table.
• Seven gears, a sprung fork and a sprung seat, on 20 × 4.0 tires Ridstar calls "puncture-resistant".
• Free freight within the contiguous United States when it is in stock, with the carrier claim filed for you if the box arrives damaged.

Red flags

• It is sold out on our store, and no Ridstar store sold a US variant on October 16, 2026. If you ride two-up today, look at the SF20H, or email us for what we know about the FM001 coming back.
• 330 lb covers both of you, and the average American man and woman weigh 370.6 lb together. Weigh the two of you first; for two adults past 330 lb, Qiolor rates the Tiger Plus at 400 lb with seating for "2 riders".
• At 1,000 W it sits above the 750-watt limb of 44 of the 51 state definitions. Read your state's definition first; for a motor its maker prints as "Class 2", look at the SF20H.
• Its spare pack and front axles are sold on the same listings as the warned Q20's. The maker's record sets out what is known; put the same-part question to any seller in writing.
• Mechanical disc brakes, maker and rotor size unprinted. For hydraulic discs with two aboard, the SF20H lists "Dual LOGAN Hydraulic Disc Brakes".
• No UL certificate holder or file number is printed. The UL section lists what to ask for, and the SF20H prints "UL2271 & UL2849 Safety Certified" on VTUVIA's page.
• No bike weight is printed anywhere. Ask in writing for the weighed figure before you plan a rack, a stair or a car.
• Ridstar's stores limit their service to their own buyers. Buying it from us sets the statements side by side so you can see which applies.

Buy it if / Buy something else if

Buy it if it is back in stock and you want a fat-tire step-through that seats a child behind you for $654.35, you are between 5'4" and 6'2", your state takes a motor Ridstar rates at 1,000 W, and the two of you plus the basket stay under 330 lb.

For one average-weight adult and a child of 12 or younger, the CDC averages leave room under that limit, and the model gives 39 miles at 15 mph on throttle alone at 250 lb on the flat. At $654.35 you pay about $0.91 per watt-hour of battery, and a year of 1,000 miles at 15 mph on throttle alone takes about $3 of electricity.

Buy something else if you want to carry someone today, or ride where e-bikes are admitted by class. The VTUVIA SF20H, $1,299 on our store, lists "48V 750W（PEAK 1200W）", "Class 2", "UL2271 & UL2849 Safety Certified", "Total capacity 330 Lbs" and a rear foot peg "for carrying a second rider" on VTUVIA's page, which showed White and Black in stock on October 16, 2026.

It folds, it weighs "60 Lbs" with its rack and fenders by VTUVIA's figure, and it carries a 672 Wh pack, so it trades 48 Wh of the FM001's battery for a printed class, printed certifications and hydraulic brakes. Our SF20H review computes its range and fit.

Buy something else if the two of you weigh more than 330 lb together. The Qiolor Tiger Plus, $2,499 in black or silver on our store, lists "Max Load 400 lbs", "Seat 2 riders", "Rear Passenger Footrests Included!", a "48V 35Ah" removable battery, "Class 2" and "Bike Weight 90 lbs" on Qiolor's page, which showed both colors in stock that day.

Qiolor prints its weight, 90 lb, and its 400 lb rating gives two adults 70 lb more than the FM001's 330 lb. Qiolor's page prints "Recommended Height 5'3" - 6'6"", an inch lower and four inches higher than Ridstar's window.

Buy something else if you need the warranty held by the store that sells you the bike. Buying it from us sets Ridstar's two statements beside our policy, and we answer in writing which one applies before you pay.

Before you buy: the checklist

Six checks cover the FM001 before you order it or carry anyone: your state's line, the 330 lb sum, the helmets, the parts question, the warranty question and the first week.

1. Look up your state's definition in our atlas, then read the passenger rule that goes with it in the passenger-law section.
2. Weigh both of you and the basket and keep the total under 330 lb; the load rows show your miles at each weight.
3. Put a helmet on both of you. California's motorized-bicycle rule asks one of "A driver and any passenger", and its bicycle rule one of every passenger under 18.
4. Ask whether the FM001's spare pack and front axles are the Q20's parts, and read the maker's record before you decide.
5. Before paying, settle who would repair it, from the warranty statements below.
6. In the first week, inspect the delivery within 48 hours, tighten both axles before you carry anyone (Ridstar's own note reads "Front tires must be securely installed"), check your rear axle for the spin one owner described, and set the saddle with the heel check.

Buying it from us

Our FM001 listing read "Sold out" at $654.35 on October 16, 2026, and the rows below are what our price buys whenever it is back, and what the SF20H and Tiger Plus buy today. Each row is a service of ours, in the words our store used that day.

Read from our terms of service, our shipping policy, our refund policy and our checkout on October 16, 2026. On the same day our cart quoted $0.00 shipping on the SF20H to ZIP codes in California, Texas, New York, Illinois, Florida, Alaska and Hawaii, though if you live in Alaska or Hawaii the policy still asks you to write first.

Our refund policy takes back a bike for a change of mind only unopened in its factory-sealed packaging and requested within 72 hours of delivery, and charges a 15% restocking fee plus the return freight; canceling any order costs a 3% transaction fee.

Three stores, three sets of terms. The FM001 sits on all three, and none sold it for US delivery that day.

Each Ridstar term is quoted from its own FM001 page as it read on October 16, 2026: ridstar.net's, whose policy tab also sets a 5% fee to cancel before shipment, and ridstar.com's; ours come from our policies.

Settle who repairs it before you buy. ridstar.net's statement says it "will not provide any after-sales service to customers who purchase ridstar products from other places", while its own warranty page says "Ridstar dealers or Ridstar authorized partners will repair or replace, at no charge," a product that proves defective.

Our refund policy says a power, charging or component fault "is covered under manufacturer warranty — we coordinate repair or replacement remotely." For a bike bought here, Ridstar's statements and ours point different ways, and this page cannot settle them; write to us and we will tell you which applies before you pay.

Frequently asked questions

What is the Ridstar FM001?

The Ridstar FM001 is a 20-inch step-through fat-tire e-bike with a removable rear seat, backrest and footrest for a second rider, a rear hub motor Ridstar rates at "1000W" with a "PEAK 1500W", a 48V 15Ah pack and a 330 lb load limit. ridstar.net's spec block calls it "Model Number : FM-001", and its technical table lists "Brand Bopzin". Every figure in the specification table is quoted from the page that prints it.

Is the Ridstar FM001 a 2-seater?

Yes: all four of Ridstar's FM001 listings title it a 2-seater, and ridstar.net describes a "removable rear seat, backrest, and footrest" that "accommodates both children and even an adult rider". Your passenger's cushion sits on the rear rack with a grab loop and a backrest; Ridstar's seat image prints "Backrest Max Weight:170 LBS".

Can two adults ride the Ridstar FM001?

Only inside the 330 lb limit, and two average American adults are over it: the CDC's survey of 2015 to 2018 puts the average man at 199.8 lb and the average woman at 170.8 lb, 370.6 lb together. Weigh yourselves first; for two adults past 330 lb, Qiolor rates the Tiger Plus at 400 lb.

Is it legal to carry a passenger on the Ridstar FM001?

It depends on what your state calls a 1,000 W bike. In California, if it is a motorized bicycle, § 27800 allows a passenger only "on a seat securely fastened to the machine at the rear of the driver and provided with footrests", the kit the FM001 ships with, and § 27803 puts a helmet on both of you. The passenger-law section quotes the bicycle rules where Ridstar's 20 mph figure makes it an e-bike.

Can a child ride on the back of the Ridstar FM001?

Ridstar calls the rear seat "suitable for children" and says "Underage riders MUST be accompanied by parents or adults when riding." Under a bicycle rule, California wants a retaining seat for a passenger "four years of age or younger, or weighs 40 pounds or less", and Rhode Island's § 31-19-4 allows a child of six or younger in "a rear-mounted bicycle carrier and/or trailer" meeting its standards. Your state decides whether the FM001's seat counts.

Does a passenger need a helmet on the FM001?

In California, yes on either reading. If the FM001 is a motorized bicycle, § 27803(a) says "A driver and any passenger shall wear a safety helmet"; if it were a bicycle, § 21212 covers every passenger under 18. Other states set their own lines, and our atlas quotes each state's definition.

How fast does the Ridstar FM001 go?

Ridstar prints three answers: "Max Speed 20MPH" on ridstar.com, "28+++ mph" in ridstar.net's text and "30mph" on its motor image, and the dealer ridstar.eu prints "50 km/h". The range model's motor, free-spinning at 30 mph, holds 26.3 mph on level pavement with a 180 lb rider; one owner on Reddit reported 25 mph by phone GPS against 30 on the speedometer.

How far can the Ridstar FM001 go on one charge?

On level pavement a 180 lb rider computes to 43 miles at 15 mph on throttle alone, 30 at 20 mph and 67 at 15 mph with easy pedaling; at the 330 lb limit, 34 miles at 15 mph. Keep a quarter of the pack back and plan on 32 miles at 15 mph for one rider. Ridstar prints 30 and 50 miles and a "25-45 Miles" band; the maker's figures maps each to a ride.

What battery does the Ridstar FM001 use?

A removable 48V 15Ah lithium-ion pack, 720 Wh by arithmetic, which ridstar.net says charges in "4-6 hours at 3A" and calls "certified" without naming a standard. On October 16, 2026 ridstar.net sold a spare as the "FM-001" option on its Q20/DC26/H20 battery listing for $379, in stock, and the record section explains why that listing matters.

How much does the Ridstar FM001 weigh?

None of Ridstar's four FM001 listings prints a weight for the bike, and neither do their technical table, their gallery or the dealer's page. The 330 lb on its spec list is the load it carries, not the bike. This review's range model uses 66.0 lb from the weight field of Ridstar's product feed and shows a heavier 81.6 lb beside it; ask for the weighed figure before you plan a lift.

Is the Ridstar FM001 street legal?

Its 1,000 W rating, Ridstar's own figure, puts it outside the federal low-speed electric bicycle definition and California's, and over the 750-watt limb in 44 of the 51 state definitions we read. Our screen puts it inside the definition in the District, Montana, Oregon and Rhode Island at ridstar.com's 20 mph, and nowhere at 28 or 30 mph; the class section has the detail.

Is the Ridstar FM001 named in the CPSC warnings?

No. The Commission's two Ridstar warnings, on fires and on front wheels, name the Q20, the Q20 Pro and the Q20 Lite, and no Ridstar recall exists. The record section explains why the FM001's battery and front-axle listings are the open questions.

What warranty does the Ridstar FM001 have?

It depends on the store. ridstar.net's FM001 text gives "a 1-year warranty on the motor, battery, and charger", and its technical table "One-year warranty for the ebike components and lifetime tech support"; ridstar.com's page prints "Hassle-Free 2-Years Warranty" and limits it to "customers ordering from ridstar.com". Buying it from us sets out ours.

Where is the Ridstar FM001 manual?

ridstar.net's technical table lists a "User manual" among the "Included Components", so one comes in the box, and none of the four FM001 pages links one online. Ridstar's ridstar.com page titled "Ridstar/YVY User Manual" held its return policy and no manual when our series read it on October 16, 2026. If you need a figure from that manual, ask us and we will answer in writing.

How tall do you need to be for the Ridstar FM001?

Ridstar prints one window, "Recommended Height 5'4" -6'2"" on ridstar.com and "5.4 to 6.2 feet" on ridstar.net. If you are 5'8" with the Army survey's median 32.6-inch inseam, you want the saddle top 35.6 inches above the pedal axle; Ridstar prints no seat range to show whether the post reaches it.

Which Ridstar website sells the FM001?

Ridstar's own two stores both list it: ridstar.net at $569 for its sold-out US variant and $599 for its Canadian one, and ridstar.com at $1,129.00 with shipping to Canada only. The dealer ridstar.eu listed it out of stock at €935.00, ridstar-ebike.com listed no FM001, and ridstar.uk answered 404 on every route, so it could not be read.

Where can I buy a Ridstar FM001?

On October 16, 2026 none of the stores we read sold it for US delivery: our listing and ridstar.net's US variant both read "Sold out", ridstar.com shipped its one variant to Canada, and the dealer ridstar.eu showed it out of stock. Email us and we will tell you what we know about a restock; for a two-up bike in stock today, start with the SF20H.

What should I check if my Ridstar FM001 is not charging?

Ridstar publishes no charging troubleshooting for the FM001, and one owner's review on ridstar.net says theirs "would not turn on again" after one charge. Note what the display shows and whether the pack is seated and locked, then write to us: bought here, a bike that "won't charge" counts as a fault under our refund policy, and we arrange the repair or replacement with the maker.

How long does the Ridstar FM001 take to assemble?

No FM001 page prints an assembly time. ridstar.net says its products "come 90% pre-assembled", and the bike's own listing warns that "Front tires must be securely installed", so the front wheel is the step to check twice. Set your saddle with the heel check, then tighten both axles before you carry anyone.

Is the Ridstar FM001 worth it?

At $654.35 it carries a 720 Wh pack, about $0.91 per watt-hour, with the seat, backrest, footrest, basket and lights fitted. That value holds when it is back in stock, your state takes a 1,000 W motor, and the two of you stay under 330 lb; for a two-up bike you can buy today, start with the SF20H in the verdict.

Limitations of this review

Here is what this page cannot tell you about the FM001 and its sellers, with what each gap means for your decision and the question to send us about it.

1. Ridstar's figures disagree, and each is printed. The top speed is 20, 28+++ and 30 mph, with the dealer's 50 km/h a fourth; the range 30 and 50 miles, and 25 to 45 on a battery image; the slope 35 and 30 degrees; the frame aluminum on Ridstar's table and steel on the dealer's page; the warranty one year and two.
2. No bike weight is printed. The model runs on 66.0 lb, the weight field of Ridstar's own product feed for the FM001, a field that reads 330.0 lb, a load figure, on one of Ridstar's H20 listings; the 81.6 lb bracket moves the 15 mph figure by about a mile.
3. Some of our listing's text predates this review. On October 16, 2026 it still held older descriptions of the bike and of our terms; where it disagrees with Ridstar's current pages or our checkout, this page prints what those sources showed that day.
4. The range model's motor is a stand-in: Ridstar publishes no curve for the FM001's own motor. The model rescales Bafang's published RM G0H0 curve to 48 V and 1,000 W, sets its free-spinning speed from Ridstar's 30 mph, and lets the sensitivity cases carry the 15 mph figure anywhere from 42 to 46 miles.
5. The controller's current limit is not printed. All climb rows stay within Ridstar's 1,000 W and 85 N·m, but the 15% row draws about 52 A from the pack, a figure from arithmetic that the controller may cap lower.
6. The wheel diameter is another maker's figure. Ridstar prints a 20 × 4.0 tire and no outer diameter, so the model uses the 22.8 inches Samebike prints for the same tire; it sets the torque a climb needs and not the flat-road figures.
7. The FM001's own tires carry no published measurement. Ridstar names no tire maker or pressure, so the bracket spans ten fat tires measured on a drum.
8. One published cell, the LG HG2, carries the cold rows, since Ridstar names no cell, and below freezing their brackets widen.
9. We found no measured FM001 ride, with its rider's weight and speed given, to set against the model. The one owner's phone reading of 25 mph comes with no weight beside it, and a passenger's own drag is not in the model.
10. Ridstar prints none of its range figures with a speed or a passenger, so the maker's figures are tied to the steady one-rider ride each implies.
11. Ridstar prints no seat height, saddle range, standover, crank length or grip reach, and nothing about the passenger seat's height or the footrests' position. The saddle figures are the formula's, and the lean, the hand load and the passenger's fit are not computed.
12. ANSUR II, the US Army survey behind the fit tables, measured soldiers, 4,082 men and 1,986 women who differ from the general public, and it holds too few riders above 6'4" for a row. Your own inseam outranks any row.
13. The saddle formulas describe averages. Across the studies the recommendation runs from 106% to 110.4% of inseam, so on your own leg the heel check has the final say.
14. The passenger weights are national means. The CDC figures describe averages from 2015 to 2018, and Ridstar's image does not say what its "Backrest Max Weight:170 LBS" applies to.
15. No UL certificate for the FM001 appears anywhere on Ridstar's pages. Its battery sentence names no standard, and the one "CE" document ridstar.net links tests another machine, a 250 W cargo bike, "FM-002".
16. The warnings, the UK report and the suits do not name the FM001, and no Ridstar page says whether its spare pack and front axles and the Q20's are the same parts; this review does not say either way.
17. Owners' accounts are few and quoted as theirs. Three review texts carried on ridstar.net, all scored five stars, and one Reddit post; a second Reddit post that repeats the listing's own wording is not used. None is totaled.
18. The passenger-law section quotes California's motorized-bicycle and bicycle rules and the bicycle rules of the four places the screen admits the FM001, and not the moped passenger rules of the other states; our atlas is where each state's definition lives.
19. Only one dealer could be compared. ridstar.eu carries the FM001, ridstar-ebike.com listed none, and ridstar.uk returned 404 on every route on October 16, 2026, so it could not be read.
20. The state census reads the statutes as published on September 24, 2026, with the federal, California, Oregon and Rhode Island text quoted here re-read on October 16 and the District's rule quoted from our deposit of September 15.

The bottom line

Buy the Ridstar FM001 when it is back in stock if you want a fat-tire step-through that seats a child behind you for $654.35, you are 5'4" to 6'2", your state takes a 1,000 W motor, and the two of you stay under 330 lb.

On flat pavement it computes to 43 miles at 15 mph on throttle alone for a 180 lb rider and 34 at the 330 lb limit, and 1,000 one-rider miles cost about $3 a year to charge. Read the maker's record, ask whether the spare pack and front axles are the Q20's parts, and put a helmet on both of you.

It was sold out on October 16, 2026. If you need two seats today, the VTUVIA SF20H is $1,299: buy it in White or in Black. For two adults past 330 lb, the Qiolor Tiger Plus is $2,499 in black or silver.

Image credit: every image below the cover is Ridstar's own file from its ridstar.net and ridstar.com FM001 listings, whole at its native size or scaled evenly, or a crop of Ridstar's own studio photograph, with no retouching.

Cover: the bike is Ridstar's own front three-quarter studio photograph from its ridstar.net listing, scaled evenly and otherwise untouched. The studio behind it is a house background made earlier on Playcut (playcut.ai) with Nano Banana Pro and reused as it was, with the type set in the empty space beside the bike.

Source register

Every document this review relies on is listed below with the tier we grade it at, the figure or sentence it backs on this page and the day we read it.

Expiry conditions

Any of these would date the page: the FM001 back in stock on our store or on either Ridstar store for US delivery; a recall, a new warning or a change to either warning from the CPSC; a changed figure, listing, price or warranty on any Ridstar store; a printed FM001 weight; a Ridstar page saying whether the FM001 and Q20 batteries or front axles are the same parts; or a ruling or new filing in either lawsuit.

So would a change to our listing's price, stock or text, or to our shipping or refund policy; a change to 15 U.S.C. § 2085, California Vehicle Code §§ 312.5, 406, 21204, 21207.5, 21212, 27800 or 27803, or any passenger rule quoted here; California's AB 1614 taking effect on January 1, 2027; or a change to any state definition in our census. Verified October 16, 2026.

References

The same documents again, numbered, with the publisher, the part relied on, the day each was read and its web address, so any figure here can be checked at its source.

1. U.S. Consumer Product Safety Commission, CPSC Warns Consumers to Immediately Stop Using Ridstar E-Bikes Due to Fire Hazard; Risk of Serious Injury or Death. CPSC warning 26-337, March 19, 2026: names the Ridstar Q20 and Q20 Pro and not the FM001; 'The e-bikes' batteries and wires can ignite'; 11 reports of fire; the manufacturer, Huizhou Xingqishi Sporting Goods Co., Ltd., 'has refused to agree to an acceptable recall'; 'The company objects to this press release'; black bikes with 'the brand name Ridstar is printed on the battery', the model number 'on the purchase receipt'. Retrieved Oct 16, 2026. https://www.cpsc.gov/Warnings/2026/CPSC-Warns-Consumers-to-Immediately-Stop-Using-Ridstar-E-Bikes-Due-to-Fire-Hazard-Risk-of-Serious-Injury-or-Death
2. U.S. Consumer Product Safety Commission, CPSC Warns Consumers to Stop Using Ridstar E-Bikes Immediately Due to Crash Hazard; Risk of Serious Injury or Death. CPSC warning 26-584, June 25, 2026: names the Ridstar Q20 and Q20 Lite and not the FM001; 'The front wheel can detach without warning'; 32 reports, 31 with injuries; the manufacturer 'has been unresponsive'; sold at AliExpress.us, Amazon.com, Ridstar.net and Walmart.com. Retrieved Oct 16, 2026. https://www.cpsc.gov/Warnings/2026/CPSC-Warns-Consumers-to-Stop-Using-Ridstar-E-Bikes-Immediately-Due-to-Crash-Hazard-Risk-of-Serious-Injury-or-Death
3. U.S. Consumer Product Safety Commission, Recalls & Product Safety Warnings. CPSC recalls on October 16, 2026: no recall naming Ridstar, its maker, YVY or the FM001 (FM-001, MF001) in the whole list of 10,053 records, the newest October 15, 2026, or the recall feed's 40 items; the warning list's 375 rows carry the two Ridstar warnings and no FM001 row. Retrieved Oct 16, 2026. https://www.cpsc.gov/Recalls
4. Office for Product Safety and Standards (UK), Product Safety Report: Ridstar E-Bikes and Chargers (2506-0011). UK OPSS product safety report 2506-0011, June 19, 2025: Ridstar 'Q20-Plus, Q20-Mini, E26 Pro and Chargers', a serious fire risk from the charger's soldering and creepage and clearance distances; the import 'has been rejected at the border'; the FM001 not named. Retrieved Oct 16, 2026. https://www.gov.uk/product-safety-alerts-reports-recalls/product-safety-report-ridstar-e-bikes-and-chargers-2506-0011
5. U.S. District Court for the District of Oregon (docket via CourtListener RECAP), Cunanan v. Amazon.com Services LLC, No. 3:26-cv-00692. Cunanan v. Amazon.com Services LLC, No. 3:26-cv-00692 (D. Or.): allegations about a 'Ridstar Q20' front wheel; Ridstar not a named defendant; no ruling on the docket on October 16, 2026. Retrieved Oct 16, 2026. https://www.courtlistener.com/docket/73159439/cunanan-v-amazoncom-services-llc/
6. U.S. District Court for the Southern District of Florida (docket via CourtListener RECAP), L.E., a minor, v. Walmart Inc., No. 9:26-cv-81045. L.E. v. Walmart Inc., No. 9:26-cv-81045 (S.D. Fla.): allegations about a bike titled 'Peak 1500W30MPH,48V 15.6Ah' whose front wheel detached; Ridstar not a named defendant; no ruling on the docket on October 16, 2026. Retrieved Oct 16, 2026. https://www.courtlistener.com/docket/74691512/le-v-walmart-inc/
7. US Government Publishing Office, 15 U.S.C. § 2085 — Low-speed electric bicycles. 15 U.S.C. § 2085(b): a low-speed electric bicycle has 'fully operable pedals and an electric motor of less than 750 watts (1 h.p.)' and a motor-only top speed 'less than 20 mph'. Retrieved Oct 16, 2026. https://www.govinfo.gov/content/pkg/USCODE-2024-title15/html/USCODE-2024-title15-chap47-sec2085.htm
8. California Legislative Information, California Vehicle Code § 312.5. Cal. Veh. Code § 312.5(a): an electric bicycle's motor 'does not exceed 750 watts of power'; class 2 stops assistance at 20 miles per hour. Retrieved Oct 16, 2026. https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=VEH&sectionNum=312.5.
9. California Legislative Information, California Vehicle Code § 406. Cal. Veh. Code § 406(a): a motorized bicycle or moped has 'fully operative pedals for propulsion by human power', 'an automatic transmission and a motor that produces less than 4 gross brake horsepower' and a top speed 'of not more than 30 miles per hour on level ground'. Retrieved Oct 16, 2026. https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=VEH&sectionNum=406.
10. California Legislature, California Vehicle Code § 21204. Cal. Veh. Code § 21204(b): a bicycle passenger rides only 'upon or astride a separate seat attached thereto', and a passenger 'four years of age or younger, or weighs 40 pounds or less' needs a seat that retains and protects them. Retrieved Oct 16, 2026. https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=VEH&sectionNum=21204.
11. California Legislature, California Vehicle Code § 21212. Cal. Veh. Code § 21212(a): a person under 18 riding a bicycle 'as a passenger' wears a fitted, fastened bicycle helmet. Retrieved Oct 16, 2026. https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=VEH&sectionNum=21212.
12. California Legislative Information, AB 1614 (Dixon), Vehicles: bicycles — chaptered text, history and status. California AB 1614 (Dixon), Chapter 40, Statutes of 2026, approved by the Governor June 30, 2026: extends § 21204's rider-seat and passenger-seat rules from 'a highway' to 'a highway or a Class I bikeway'. Retrieved Oct 16, 2026. https://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202520260AB1614
13. California Legislative Information, California Constitution, article IV, section 8. California Constitution, article IV, section 8(c)(1): a non-urgency statute takes effect 'on January 1 next following a 90-day period from the date of enactment of the statute', so AB 1614 takes effect January 1, 2027. Retrieved Oct 16, 2026. https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CONS&sectionNum=SEC.%208.&article=IV
14. District Department of Transportation, District of Columbia Municipal Regulations, Title 18, § 1201. 18 DCMR § 1201.5: 'No person shall operate or ride on a bicycle or motorized bicycle with more persons on it at any one time than the vehicle is equipped to carry.' Retrieved Oct 16, 2026. https://dcregs.dc.gov/Common/DCMR/SectionList.aspx?SectionNumber=18-1201
15. Oregon Legislative Assembly, ORS 814.460 — Unlawful passengers on bicycle. ORS 814.460(1): an offense to carry 'more persons on the bicycle than the number for which it is designed or safely equipped', a Class D traffic violation. Retrieved Oct 16, 2026. https://www.oregonlegislature.gov/bills_laws/ors/ors814.html
16. Rhode Island General Assembly, R.I. Gen. Laws § 31-19-4. R.I. Gen. Laws § 31-19-4: 'No bicycle shall be used to carry more persons at one time than the number for which it is designed or equipped', except a child six or younger in a rear-mounted bicycle carrier or trailer meeting the standards it names. Retrieved Oct 16, 2026. https://webserver.rilegislature.gov/Statutes/TITLE31/31-19/31-19-4.htm
17. State of Rhode Island General Assembly, R.I. Gen. Laws § 31-1-3 (definitions). R.I. Gen. Laws § 31-1-3(g): an electric bicycle's motor is 'rated not more than two (2) (S.A.E.) horsepower', on a bike capable of 'not more than twenty-eight miles per hour'. Retrieved Oct 16, 2026. https://webserver.rilegislature.gov/Statutes/TITLE31/31-1/31-1-3.HTM
18. New Jersey Legislature, P.L.2025, c.285. New Jersey P.L.2025, c.285: the state's low-speed electric bicycle definition admits assistance only while the rider pedals, so a throttle takes a bike outside it. Retrieved Oct 16, 2026. https://pub.njleg.gov/Bills/2024/PL25/285_.HTM
19. California Legislative Information, California Vehicle Code § 21207.5. Cal. Veh. Code § 21207.5(a): a motorized bicycle is barred from 'a bicycle path or trail, bikeway, bicycle lane' unless the path is 'within or adjacent to a roadway' or a local ordinance allows it. Retrieved Oct 16, 2026. https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=VEH&sectionNum=21207.5.
20. Forest Service, USDA (eCFR), 36 CFR § 261.13 — Motor vehicle use. 36 CFR 261.13: motor vehicle use on National Forest System roads and trails follows the motor vehicle use map. Retrieved Sep 26, 2026. https://www.ecfr.gov/current/title-36/chapter-II/subchapter-B/part-261/subpart-A/section-261.13
21. U.S. Department of Agriculture, Forest Service (Office of the Federal Register, eCFR), 36 CFR 261.2 Definitions. 36 CFR 261.2: a motor vehicle is 'any vehicle which is self-propelled, other than' a vehicle on rails or a wheelchair or mobility device. Retrieved Oct 16, 2026. https://www.ecfr.gov/current/title-36/chapter-II/part-261/subpart-A/section-261.2
22. U.S. Department of Agriculture, Forest Service (Office of the Federal Register, eCFR), 36 CFR 261.1b Penalty. 36 CFR 261.1b: the penalty for a Part 261 violation, 'imprisonment of not more than six months or a fine in accordance with' the federal criminal code. Retrieved Oct 16, 2026. https://www.ecfr.gov/current/title-36/chapter-II/part-261/subpart-A/section-261.1b
23. U.S. Army Natick Soldier Research, Development and Engineering Center, 2012 Anthropometric Survey of U.S. Army Personnel (ANSUR II), public data release 2017. US Army ANSUR II survey, 6,068 bodies: the inseam bands and medians behind the fit tables and the Mercer rows. Retrieved Sep 25, 2026. https://www.army.mil/article/188601/for_good_measure_natick_releases_raw_data_from_army_wide_anthropometric_survey
24. Journal of Exercise Physiology Online (American Society of Exercise Physiologists), Peveler et al., Comparing methods for setting saddle height in trained cyclists, JEPonline 8(1):51-55. Peveler et al. (2005): the 109% of inseam saddle formula and its 109.2 ± 0.9% check; the heel method. Retrieved Sep 25, 2026. https://www.asep.org/asep/asep/JEPonlineFEBRUARY2005_PevelerSaddle.doc
25. Journal of Strength and Conditioning Research (NSCA), Ferrer-Roca V, Roig A, Galilea P, Garcia-Lopez J. Influence of saddle height on lower limb kinematics in well-trained cyclists: static vs. dynamic evaluation in bike fitting. J Strength Cond Res 26(11):3025-9; doi 10.1519/JSC.0b013e318245c09d. Ferrer-Roca et al. (2012): 106% to 109% of inseam recommended, 108.6% to 110.4% from the equation; the 25 to 35 degree knee band. Retrieved Sep 25, 2026. https://pubmed.ncbi.nlm.nih.gov/22190163/
26. Journal of Strength and Conditioning Research (NSCA), Peveler, Pounders & Bishop, Effects of saddle height on anaerobic power production in cycling, JSCR 21(4):1023-7. Peveler, Pounders and Bishop (2007): the 25 to 35 degree knee angle at the bottom of the stroke. Retrieved Sep 25, 2026. https://pubmed.ncbi.nlm.nih.gov/18076230/
27. University of Colorado Boulder (MS thesis), Carahalios A. An Analysis of the Bicycle-Rider Interface Forces in Stationary Road Cycling (MS thesis, Department of Integrative Physiology, University of Colorado). Carahalios (2015): about 15% of body weight through the stem for road racers on the hoods, the hand-load reference. Retrieved Sep 25, 2026. https://scholar.colorado.edu/downloads/70795789x
28. BAFANG, BAFANG Workbook OEM 2021. Bafang OEM workbook 2021, RM G0H0: the comparable motor curve the range model rebases to 48 V and 1,000 W, and its 80% efficiency floor. Retrieved Sep 23, 2026. https://www.bafang-e.com/Uploaded/Labels/BAFANG%20Workbook%20OEM%202021.pdf
29. Bicycle Rolling Resistance (Jarno Bierman), Fat Bike Tires Test Results. Bicycle Rolling Resistance fat-bike tests: ten 26 x 4.00 tires, median rolling resistance 0.0105, lowest 0.0070, highest 0.0126. Retrieved Sep 25, 2026. https://www.bicyclerollingresistance.com/fat-bike-reviews
30. Journal of Applied Biomechanics (Human Kinetics), Martin JC, Milliken DL, Cobb JE, McFadden KL, Coggan AR. Validation of a Mathematical Model for Road Cycling Power. Martin et al. (1998): the cycling-power equation and its Appendix I worked example the model reproduces. Retrieved Sep 23, 2026. https://collections.lib.utah.edu/dl_files/b4/8e/b48ef26086091662c561e673d7bd990d77868437.pdf
31. Journal of Sports Sciences (Taylor & Francis), Tengattini S, Bigazzi AY. Physical characteristics and resistance parameters of typical urban cyclists. Tengattini and Bigazzi (2018): drag area 0.640 m² for upright cruiser riders and 0.603 m² for everyday mountain-bike riders. Retrieved Sep 23, 2026. https://civil-reactlab.sites.olt.ubc.ca/files/2022/11/Tengattini_2018_Physical-characteristics-and-resistance-parameters-of-typical-urban-cyclists.pdf
32. World Electric Vehicle Journal (MDPI), Arango I, Lopez C, Ceren A. Improving the Autonomy of a Mid-Drive Motor Electric Bicycle Based on System Efficiency Maps and Its Performance. Arango, Lopez and Ceren (2021): the battery-efficiency curve applied at the same C-rate. Retrieved Sep 23, 2026. https://mdpi-res.com/d_attachment/wevj/wevj-12-00059/article_deploy/wevj-12-00059.pdf
33. IEEE / EPE'19 ECCE Europe (Karlsruhe Institute of Technology authors), Schmitt M, Decker S, Doppelbauer M. Measuring and Characterization of a Pedal Electric Cycle (Pedelec) on a Full System Test-Bench. Schmitt, Decker and Doppelbauer (2019): a measured pedelec drew 75% of its nominal capacity, the 25% planning reserve. Retrieved Sep 23, 2026. https://publikationen.bibliothek.kit.edu/1000100371/50695920
34. McMaster University (Kollmeyer et al.), Mendeley Data, LG 18650HG2 Li-ion Battery Data and Example Deep Neural Network xEV SOC Estimator Script. LG HG2 cell discharge data by temperature: the pack-energy column of the cold table. Retrieved Sep 23, 2026. https://doi.org/10.17632/b5mj79w5w9.2
35. Bicycle Rolling Resistance (Jarno Bierman), CRR at Different Temperatures: Examining Temperature Dependence of Rolling Resistance. Bicycle Rolling Resistance temperature test: rolling resistance falls about 0.88% per degree Celsius warmer. Retrieved Sep 23, 2026. https://www.bicyclerollingresistance.com/specials/crr-temperature-test
36. International Journal of Vehicle Systems Modelling and Testing (Inderscience), Rothhamel M. On rolling resistance of bicycle tyres with ambient temperature in focus. Rothhämel (2023): rolling resistance falls about 0.97% per degree Celsius warmer between +5 and +25 °C. Retrieved Sep 23, 2026. https://www.inderscience.com/filter.php?aid=132317
37. NOAA, NASA, US Air Force, U.S. Standard Atmosphere, 1976 (NOAA-S/T 76-1562; NASA TM-X-74335). U.S. Standard Atmosphere, 1976 (NOAA, NASA, USAF): air density by temperature. Retrieved Sep 23, 2026. https://ntrs.nasa.gov/api/citations/19770009539/downloads/19770009539.pdf
38. Samebike (maker), M20-III Off Road Peak 3000W Fat Tire Electric Bike — Samebike US product page. Samebike's printed 22.8-inch wheel figure for a 20 x 4.0 tire, the range model's wheel comparable. Retrieved Oct 2, 2026. https://us.samebike.com/products/m20-iii-off-road-peak-3000w-fat-tire-electric-bike
39. U.S. Energy Information Administration, Electric Power Monthly, Table 5.6.A. Average Price of Electricity to Ultimate Customers by End-Use Sector. US EIA Electric Power Monthly Table 5.6.A: residential electricity averaged 18.31 cents per kWh in July 2026, the cost of a charge and of 1,000 miles. Retrieved Oct 16, 2026. https://www.eia.gov/electricity/monthly/epm_table_grapher.php?t=epmt_5_06_a
40. CDC National Center for Health Statistics, Anthropometric Reference Data for Children and Adults: United States, 2015-2018 (Vital Health Stat Series 3, No. 46). NCHS Vital and Health Statistics Series 3, No. 46 (2015-2018): mean weights, men 20 and over 199.8 lb (Table 6), women 20 and over 170.8 lb (Table 4), children by age (Table 2: boys 8 years 69.8 lb, 13 years 133.2 lb, 16 years 157.2 lb; girls 8 years 69.1 lb, 12 years 116.9 lb). Retrieved Oct 16, 2026. https://www.cdc.gov/nchs/data/series/sr_03/sr03-046-508.pdf
41. UL Solutions, E-Bikes Certification: Evaluating and Testing to UL 2849. UL Solutions: UL 2849 treats the drive train, the battery and the charger as one electrical system. Retrieved Sep 26, 2026. https://www.ul.com/services/e-bikes-certificationevaluating-and-testing-ul-2849
42. United States Patent and Trademark Office (copy hosted by Ridstar), US trademark registration certificate No. 6,936,242 (Ridstar), as hosted on ridstar.net. US trademark registration No. 6,936,242 of December 27, 2022 for 'Ridstar', owner 'Huizhoushi Xingqishi Sports Goods Co., Ltd.', linked as 'US trademark' under the FM001 listing. Retrieved Oct 16, 2026. https://cdn.shopify.com/s/files/1/0696/9960/0602/files/Ridstar_12_6936242.pdf?v=1720059854
43. European Union Intellectual Property Office (copy hosted by Ridstar), EUIPO certificate of registration, EU trade mark No. 018609888 (Ridstar), as hosted on ridstar.net. EU trademark registration No. 018609888 of March 16, 2022 for 'Ridstar', linked as 'European trademark' under the FM001 listing. Retrieved Oct 16, 2026. https://cdn.shopify.com/s/files/1/0696/9960/0602/files/Ridstar-12_018609888.pdf?v=1720059857
44. Shenzhen ATS Testing Technology Co., Ltd. (copy hosted by Ridstar), TEST REPORT EN 15194:2017 Cycles - Electrically power assisted cycles - EPAC Bicycles, No. ATS240329142LR, as hosted on ridstar.net. The EN 15194:2017 test report linked as 'CE trademark' under the FM001 listing: a 'Cargo electric bicycle', model 'FM-002, CDDA20', '250W', issued April 2, 2024; it names no FM001 and is not a UL document. Retrieved Oct 16, 2026. https://cdn.shopify.com/s/files/1/0696/9960/0602/files/FM-002_ATS240329142LR_EN15194.pdf?v=1730083922
45. Ridstar (ridstar.net), Ridstar Official Statement. Ridstar.net's official statement: 'Except ridstar.net, other similar websites are our dealers'; it 'will not provide any after-sales service to customers who purchase ridstar products from other places'. Retrieved Oct 16, 2026. https://ridstar.net/pages/ridstar-official-statement
46. Ridstar (ridstar.net), Company Address — ridstar.net. Ridstar.net's company page: 'HK RIDSTAR TRADE LIMITED', an address in Hung Hom, Hong Kong. Retrieved Oct 16, 2026. https://ridstar.net/pages/company-address
47. YVY / HK Ridstar Trade Limited (yvyebike.com), Company Address. YVY's company page names the same business, HK RIDSTAR TRADE LIMITED. Retrieved Oct 12, 2026. https://yvyebike.com/pages/company-address
48. Ridstar (ridstar.net), Ebike Warranty — ridstar.net page. Ridstar.net's warranty page: 'Ridstar dealers or Ridstar authorized partners will repair or replace, at no charge,' a product that proves defective. Retrieved Oct 16, 2026. https://ridstar.net/pages/ebike-warranty
49. Ridstar (ridstar.com), Ridstar/YVY User Manual — ridstar.com page. Ridstar.com's page titled 'Ridstar/YVY User Manual' held its return policy and no manual on October 16, 2026. Retrieved Oct 16, 2026. https://ridstar.com/pages/ridstar-yvy-user-manual
50. Ridstar (ridstar.net parts store), Ridstar Q20/DC26/H20 48V 20AH 15AH Removable Electric E-Bike Battery. Ridstar.net's 'Ridstar Q20/DC26/H20 48V 20AH 15AH Removable Electric E-Bike Battery' listing: an 'FM-001' option at $379 beside a Q20 option at $399, in stock on October 16, 2026; the listing does not say whether the options are one part. Retrieved Oct 16, 2026. https://ridstar.net/products/ridstar-q20-dc26-h20-48v-20ah-removable-electric-e-bike-battery
51. Ridstar (ridstar.net parts store), Ridstar Controller. Ridstar.net's controller listing: an FM001 option at $89, in stock on October 16, 2026. Retrieved Oct 16, 2026. https://ridstar.net/products/ridstar-controller
52. Ridstar (ridstar.net parts store), Ridstar LCD Display. Ridstar.net's LCD display listing: an FM-001 option at $69, in stock on October 16, 2026. Retrieved Oct 16, 2026. https://ridstar.net/products/ridstar-lcd-display
53. Redtail eBikes, Shipping policy. Our shipping policy: free shipping on every electric bike within the contiguous United States; dispatch within 1-3 business days; most e-bikes arrive in 5-10 business days; Alaska, Hawaii, territories, P.O. boxes and remote areas may cost more or be excluded. Retrieved Oct 16, 2026. https://redtailebikes.com/policies/shipping-policy
54. Redtail eBikes, Refund policy. Our refund policy: change-of-mind returns unopened and within 72 hours, 15% restocking fee plus return freight; damage photographed within 48 hours and the carrier claim filed by us; power, charging and component faults 'covered under manufacturer warranty — we coordinate repair or replacement remotely'; a 3% cancellation fee. Retrieved Oct 16, 2026. https://redtailebikes.com/policies/refund-policy
55. VTUVIA (VTUVIA US store), SF20H Utility Ebike — product page. VTUVIA's SF20H page: 'The rear foot peg provides added comfort for passengers, making the SF20H a great choice for carrying a second rider'; 'Total capacity 330 Lbs'; 'Class 2'; 'UL2271 & UL2849 Safety Certified'; '48V 750W（PEAK 1200W）'; '48V 14AH (672Wh)'; 'Dual LOGAN Hydraulic Disc Brakes' on 180 mm rotors; '60 Lbs'; White and Black in stock, Red and Dark Green sold out on October 16, 2026. Retrieved Oct 16, 2026. https://vtuviaebike.com/products/sf20h-fat-tire-folding-electric-bike-ul-certified-ebike
56. Qiolor, TIGER PLUS Electric Off Road Bike product page. Qiolor's Tiger Plus page: 'Max Load 400 lbs', 'Seat 2 riders', 'Rear Passenger Footrests Included!', '48V 35Ah', 'Class 2', 'Bike Weight 90 lbs', 'Recommended Height 5'3" - 6'6"'; black and silver in stock on October 16, 2026. Retrieved Oct 16, 2026. https://qiolor.com/products/tiger-plus
57. Playcut, Playcut. Playcut (Nano Banana Pro): the studio set reused around Ridstar's photograph on the cover; nothing of the bike generated. Retrieved Oct 15, 2026. https://playcut.ai
58. Ridstar (ridstar.net), Ridstar® FM001 2-Seater Fat Tire Electric Bike — ridstar.net product pages (three listings). Ridstar.net's FM001 listings (US market, USD): the listing of April 30, 2024 offers 'US' at $569.00, sold out, and 'CA' at $599.00, in stock, under a struck $1,099; a second listing (October 31, 2025) offers US $569.00, sold out, and a third (March 20, 2026) CA $599.00, in stock. Spec block 'Model Number : FM-001', 'Motor : 1000W Motor(PEAK 1500W)', 'Battery : 48V/15 Ah', 'Max Load : 330lbs', 'Max Speed :28+++ mph', 'Riding Range: 30miles (pure ebike mode) to 50miles (assist mode)', 'Brake : Mechanical Disc Brakes'; text 'a torque of 85nm', 'steep slopes up to 35°', 'removable rear seat, backrest, and footrest', 'suitable for children even adult riders', 'The certified battery incorporates BMS', 'IP5 waterproof protection', '1-year warranty on the motor, battery, and charger'; FAQ headed 'Q&A about Q20 Lite' with 'Recommended height range is 5.4 to 6.2 feet'; technical table 'Brand Bopzin', 'Manufacturer Bopzin', 'Number of Speeds 7', 'Frame Material Aluminum', 'Suspension Type Dual'; policy text 'Not for Sale to Persons Under the Age of 18' and 'Underage riders MUST be accompanied by parents or adults when riding'; banner 'Front tires must be securely installed'; 8 reviews scored 5.0, three bodies in the structured data. Retrieved Oct 16, 2026. https://ridstar.net/products/ridstar-fm001-2-seater-fat-tire-electric-bike
59. Ridstar (ridstar.com), Ridstar FM001 48V 15AH 2-Seat Fat Tire Electric Bike — ridstar.com product page. Ridstar.com's 'Ridstar FM001 48V 15AH 2-Seat Fat Tire Electric Bike' listing (US market, USD), created January 26, 2026: one variant, 'Canada', $1,129.00, regular $1,299.00, in stock, 'Free shipping to: Canada'; slider '1000W' 'POWERFUL MOTOR', '48V/15AH', 'Max Speed 20MPH', 'Max Range 30 Miles (Pure Electric Mode)/50 Miles (pedal assist mode)', 'Recommended Height 5'4" -6'2"'; 'can easily haul up to 330lbs'; 'bring a kid, friend or partner along for rides'; a 'Parameter comparison' chart beside the K20 Lite ($1,079.00); 'Hassle-Free 2-Years Warranty', 'only available to customers ordering from ridstar.com'; '15-Day Money-Back Guarantee'; 'No reviews'; a battery image printing '25-45 Miles' 'Max Range'. Retrieved Oct 16, 2026. https://ridstar.com/products/ridstar-fm001-48v-15ah-2-seat-fat-tire-electric-bike
60. Ridstar (ridstar.net), Motor image, ridstar.net FM001 listings (image 2 of 5), MF001-EBIKE-4.jpg. Ridstar's FM001 motor image (image 2 of 5 on ridstar.net's listings): '1000W HIGH-SPEED BRUSHLESS MOTOR', '30mph' 'TOP SPEED', '85n.m' 'MAX TORQUE', '30°' 'SLOPE'. Retrieved Oct 16, 2026. https://cdn.shopify.com/s/files/1/0696/9960/0602/files/MF001-EBIKE-4.jpg?v=1714449538
61. ridstar.eu (a store selling Ridstar bikes), Electric bike Ridstar FM001, 48V, 1000W, 15Ah, 2-Seater — ridstar.eu product page. Ridstar.eu, a European store selling Ridstar bikes, FM001 page: 'Electric bike Ridstar FM001, 48V, 1000W, 15Ah, 2-Seater', €935.00, regular €1,099.00; 'IN STOCK in EU warehouse' above an 'Out of stock' button (Store API is_in_stock false); 'Max speed can be limited to 25 km/h for full EU road compliance'; 'speeds up to 50 km/h'; 'ergonomic 2-seater setup featuring comfortable cushioning and rear foot pegs'; 'a high-strength steel frame and front fork suspension'. Retrieved Oct 16, 2026. https://ridstar.eu/product/electric-bike-ridstar-fm001-48v-1000w-15ah-2-seater/
62. Reddit (an owner's post), Ridstar fm001 issues — r/ebikes. An FM001 owner's post on r/ebikes, April 16, 2025: 'So im looking for a torque bar to stop my axel spin but fit. Also the bike said it goes 30mph and thats what the speedometer said but gmaps said its goes 25mph with only me on it.' Retrieved Oct 16, 2026. https://www.reddit.com/r/ebikes/comments/1k0wsb6/ridstar_fm001_issues/
63. California Legislature, California Vehicle Code § 27800. Cal. Veh. Code § 27800: 'It is unlawful for a driver of a motorcycle or a motorized bicycle to carry any other person thereon, except on a seat securely fastened to the machine at the rear of the driver and provided with footrests'; 'Every passenger on a motorcycle or a motorized bicycle shall keep his feet on the footrests while such vehicle is in motion.' Retrieved Oct 16, 2026. https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=VEH&sectionNum=27800.
64. California Legislature, California Vehicle Code § 27803. Cal. Veh. Code § 27803(a): 'A driver and any passenger shall wear a safety helmet meeting requirements established pursuant to Section 27802 when riding on a motorcycle, motor-driven cycle, or motorized bicycle.' Retrieved Oct 16, 2026. https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=VEH&sectionNum=27803.
65. Montana Legislature, Montana Code Annotated, Title 61, Chapter 8, Part 6 — sections index. Montana Code Annotated Title 61, chapter 8, Part 6 (§§ 61-8-601 to 61-8-609): § 61-8-603 seats the rider 'on or astride a permanent and regular seat'; no section of Part 6 sets how many persons a bicycle may carry. Retrieved Oct 16, 2026. https://archive.legmt.gov/bills/mca/title_0610/chapter_0080/part_0060/sections_index.html
66. Redtail eBikes, Terms of Service. Our terms of service: the agreement is with the Florida corporation doing business as Redtail Ebikes, which the terms describe as an independent retailer and not a manufacturer. Retrieved Oct 16, 2026. https://redtailebikes.com/policies/terms-of-service