Eunorau FLASH LITE ST Review 2026: 750W, $1,899

82 lb · CST 20 × 4.0 fat tires · 52V 750 W rear hub · 92 N·m · one speed · 832 Wh · 20 mph · 440 lb payload · 17.5 in standover · 31.5 in bench seat · riders 4'8"–6'4" · $1,899 in Ivory or Midnight Black · verified September 30, 2026

Quick Answer: The Eunorau FLASH LITE ST is a $1,899 moped-style step-through on 20 × 4.0 fat tires, with a 750 W rear hub, one gear, four-piston hydraulic brakes and an 832 Wh pack under a long bench seat. On the throttle over flat pavement, a 180 lb rider gets about 61 miles at 12 mph.

At 18 mph the same charge covers about 40 miles (the speed table). Eunorau lists riders from 4'8" to 6'4", and the frame dips to 17.5 inches, low enough to clear every rider modeled from 5'0" up. Its printed 750 W, throttle and 20 mph sit inside the e-bike definitions of 28 of 51 jurisdictions on September 30, 2026, and 29 from October 1 (the law section).

What's on this page

Twenty-five sections: who it suits, the motor and the one gear, the frame and the bench, the FLASH family side by side, how far it goes, what it carries, whether it fits you, what the law calls it, owning it, and the verdict.

• Who the FLASH LITE ST is for
• How we verified this Eunorau FLASH LITE ST review
• Eunorau FLASH LITE ST specifications
• The 750 W rear hub and the throttle
• One gear, the brakes and the lights
• The step-through frame and the bench
• FLASH LITE ST or another FLASH
• How far the FLASH LITE ST goes
• What the 440 lb payload covers
• Will the FLASH LITE ST fit you?
• The Mercer fit test
• What the law calls it: 750 W, a throttle and 20 mph
• Charging and battery care
• Where Eunorau prints a figure two ways
• Has it been recalled?
• Is it UL certified?
• Warranty, and who handles a claim
• Buying it from us
• The honest ledger
• Who should buy it
• Before you buy: the checklist
• Limitations of this review
• The source register
• Frequently asked questions
• The bottom line

Who the FLASH LITE ST is for

The Midnight Black in Eunorau's own photograph, set on a light studio sweep we built around it for the card. The $1,899 and 750 W are listed figures, and the range section works out the 61 miles.

It is for the rider who wants a moped's look and a bench seat without swinging a leg over a high frame: town errands, a commute across busy intersections, weekend rides on the waterfront, and a household where riders from 4'8" to 6'4" share one bike, the span Eunorau lists.

A rider on the Midnight Black's bench under a tree above the water, one foot down beside the low frame, in Eunorau's own outdoor photograph; Eunorau does not say where it was taken.

Eunorau's launch post, published November 21, 2025, says the step-through design "makes the bike particularly friendly for shorter riders, commuters navigating busy intersections, or anyone who simply prefers a relaxed and confidence-inspiring riding posture". The fit section puts numbers on that for every height.

The Ivory from the chain side, photographed by Eunorau: the frame's low dip, the bench above the battery case, and the brown sidewalls that match the bench and grips.

Want gears and rear suspension, or a lighter bike that folds? Our FLASH 2.0 review covers the $2,499 mid-drive with eight speeds, and our META20 review covers Eunorau's $1,699 folding 20-inch at 63.4 lb.

How we verified this Eunorau FLASH LITE ST review

Every specification is Eunorau's, read on September 26 and again on September 30, 2026 from the FLASH LITE ST's product page and its product record; every figure that needs arithmetic is recomputed, and the conflicts table shows where Eunorau prints one two ways.

The range and fit sections end with their formulas and inputs (range, fit), the law section screens all 51 jurisdictions on the motor, the throttle and the speed, and the Limitations date each screen and store read.

We sell the FLASH LITE ST, and the honest ledger sends each rider it suits less well to a bike of ours that suits them better. The author is Milad Ghobadibeygvand, BScN (Western University, 2014); corrections go to corrections@redtailebikes.com.

Eunorau FLASH LITE ST specifications

Every figure below is Eunorau's, as its page and record printed it on September 26 and 30, 2026.

Eunorau prints the frame's geometry in seven lettered rows beside a drawing on the product page:

Eunorau's geometry rows as printed on the FLASH LITE ST page, read September 30, 2026, with the inch figures as Eunorau gives them. Row B prints its millimeter and inch figures differently (the conflicts table).

Eunorau's geometry drawing for the FLASH LITE ST, with D, the seat height, drawn to the top of the bench and E, the standover, to the frame's lowest point. Tap it to open it full size.

The 750 W rear hub and the throttle

The motor sits in the rear wheel: Eunorau rates it at 52 V and 750 W with 92 N·m of torque, run by a 52V 22A sine-wave controller (Eunorau's page). Its feature copy says the rear placement "enhances stability and traction on urban streets" and that the brushless design runs "quiet, low-maintenance".

A thumb throttle moves the bike with no pedaling, and a 12-magnet dual-Hall sensor brings in assist as the cranks turn. In the model, a 180 lb rider on the throttle over the flat settles at the 20 mph Eunorau prints (the formula).

The rear wheel, cropped from Eunorau's chain-side photograph of the Midnight Black: the hub motor at the axle, and the chain with its tensioner running back from the single chainring.

Eunorau's FAQ for the bike says the 92 N·m provides "strong assistance on inclines", with the result depending on "the gradient, rider and cargo weight, battery level and road conditions". The climb table puts those in numbers: 13.9 mph up an 8% street with 180 lb aboard on the throttle alone, and 7.8 mph with the full 440 lb.

One gear, the brakes and the lights

The drivetrain is a single speed: a 36-tooth chainring on 170 mm forged alloy cranks, an 18-tooth freewheel, a KMC chain and an aluminum chain tensioner. One pedal turn carries the bike 3.83 meters, so your legs can keep turning up to about 14 mph, the top of the cadence trained riders hold, and the throttle holds the pace above that (the gear section).

The drivetrain, cropped from Eunorau's photograph of the Ivory: the 36-tooth chainring and crank, the platform pedal, and the chain back to the rear wheel.

Eunorau's FAQ gives the reason for one gear: "The single-speed drivetrain is simple, reliable and easy to maintain. The motor supplies additional assistance when starting or climbing, reducing the need for a conventional multi-speed gear system."

The brakes are four-piston hydraulic calipers, front and rear, on 180 mm rotors, and the brake levers carry motor cutoff switches that "interrupt motor power as soon as braking begins".

The front end, cropped from Eunorau's front three-quarter photograph of the Ivory: the swept riser bar and stitched grips, the round headlight on the fork, and the suspension fork.

The rest, from Eunorau's page:

• The display: a BC182 LCD showing speed, battery level and the assist setting, with Bluetooth for the EUNORAU GO app.
• The fork: 60 mm of travel, with compression adjustment and a lockout.
• The lights: a round LED headlight, and a rear light "integrated into the main battery case".
• The grips: "Brown leather-style grips" with stitching, matched to the bench.
• The rest: an adjustable side kickstand, waterproof electrical connectors and a tool kit.

The step-through frame and the bench

The frame is 6061 aluminum and dips to 17.5 inches between the bench and the head tube, the lowest point a rider steps across (geometry row E). The bench above it is 31.5 inches off the ground at its top (row D), long enough that Eunorau's feature copy describes "extra room for a passenger when needed".

The bench and the case beneath it, cropped from Eunorau's photograph of the Ivory. The main pack rides in that case, and the rear light is built into its back end.

At 82 lb the FLASH LITE ST is a two-person lift into a truck bed; ride it up a ramp or keep it at ground level. Its 1,740 mm (68.5 in) length and 1,090 mm (43 in) wheelbase (rows G and F) are close to a full-size bike's, so plan the parking spot around them.

The tires are CST 20 × 4.0 fat tires with brown sidewalls. Eunorau's FAQ says they add "stability and cushioning on pavement, gravel, compact dirt and firm sand", and adds that they "are not a substitute for specialized off-road tires in extreme conditions".

The Midnight Black from the front, photographed by Eunorau: the round headlight, the swept bars, and the long bench behind the low frame.

FLASH LITE ST or another FLASH

Eunorau builds four FLASH models on the same 20 × 4.0 wheels and 52V 16Ah pack, and we sell all four; the FLASH LITE ST is the only step-through. The other three share a step-over frame with a 30.7-inch standover and list riders from 5'2".

Each figure from that model's page at Eunorau (FLASH LITE ST, FLASH LITE 2.0, FLASH AWD 1.0, FLASH 2.0), read September 30, 2026, when each of our prices matched Eunorau's.

Pick the FLASH LITE ST for the step-through, the widest rider window in the family and a 17.5-inch frame to stand over at a light.

Pick the FLASH LITE 2.0 at the same $1,899 if you prefer to swing a leg over a moped-style top tube, with an 80 mm fork (our FLASH LITE 2.0 review). Pick the FLASH 2.0 for gears and rear suspension (our FLASH 2.0 review). All four sit in our Eunorau collection, and every e-bike we carry is one page further.

The Midnight Black on its kickstand, photographed by Eunorau: the bench, the battery case beneath it and the frame's low dip.

How far the FLASH LITE ST goes, on one pack or two

A 180 lb rider on the throttle at a steady 12 mph over level pavement gets about 61 miles from the standard 832 Wh pack, and about 40 at 18 mph; carry the full 440 lb and the 12 mph ride comes to about 41. Keep 15% in the pack, the top of the "10-15%" recharge point Eunorau's FAQ gives, and those solo rides plan at 52 and 34 miles.

One saved model of this bike builds every table below. It starts from Eunorau's printed figures: the 52 V, 750 W rear hub with 92 N·m, the 20 mph maximum speed, the 52V 16Ah pack, the 82 lb weight and the CST 20 × 4.0 tires. The road physics are laid out in the formula.

Work out your own range in three steps:

1. Choose the speed you ride most in the first table: 12 mph is a relaxed trip across town, 18 mph a brisk commute on the throttle.
2. Correct for your load and your streets: the weight table runs from 100 lb to the full 440, the hills table prices each grade, and the climb table shows the pace each grade allows.
3. Plan from the "15% kept" column, and pedal along below about 14 mph, where the single gear lets your legs add real help.

How far does it go at my speed?

Speed is the biggest lever you hold: the 78 miles a charge gives at 8 mph fall to 35 at the 20 mph top speed, because the power the air takes rises with the cube of your speed (Martin et al., 1998). Going from 15 to 20 mph alone costs 29% of the range.

Throttle only: a 180 lb rider, level pavement, calm air at 77 °F. "15% kept" ends the plan at the top of Eunorau's 10 to 15% recharge band; the last column adds the 17 Ah second pack in Eunorau's spec rows to the standard 16 Ah (1,716 Wh together).

Pedaling stretches a charge furthest at the speeds a single gear suits. At 12 mph an easy effort roughly halves what the pack spends:

The 832 Wh pack, a 180 lb rider, level ground. An easy effort is 75 W at the cranks and a steady one 150 W; a dash marks a speed where the 36/18 gear would turn the pedals faster than riders were measured choosing (the gear section).

Holding 12 mph asks 124.4 W of the rear wheel (Martin et al., 1998). Put 75 W into the cranks and the pack covers the rest at 6.5 Wh a mile, which spreads one charge over 127 miles; at 150 W your legs hold that pace with no help from the motor ("legs alone").

With the motor off, the same equation moves a 180 lb rider and the 82 lb bike at about 9 mph on 75 W and about 13 mph on 150 W.

Which gear saves battery?

The FLASH LITE ST has one gear, a 36-tooth chainring driving an 18-tooth freewheel, so the road speed sets how fast your feet turn: one crank turn carries the bike 3.83 meters, and 12 mph asks 84 pedal strokes a minute. On the flat at 12 mph the pack spends 13.6 Wh a mile on the throttle alone and 6.5 with easy pedaling.

Watt-hours a mile from the 832 Wh pack for a 180 lb rider in calm air, your pedaling measured at the cranks. At 150 W on the flat your legs carry the whole 12 mph, so the pack spends nothing.

The pedal cadence the 36/18 gear sets at each road speed on the nominal 20 × 4.0 wheel. Pedaling figures on this page stop at 100 rpm, the top of the band trained riders held in Marsh and Martin (1997).

In that study, cyclists "maintained PC between 90 and 100 rpm at all power outputs", while the less-trained group "reduced cadence from approximately 80 rpm at 75 W to 65 rpm at 175 W". On this gear, 80 strokes a minute is 11.4 mph and 100 is 14.3 mph.

Pedal hardest from a standstill and up to about 14 mph, then let the throttle hold the pace above that, which is the job Eunorau's FAQ for the bike gives the motor: it "supplies additional assistance when starting or climbing".

How much do hills cost, and how steep a hill can it climb?

Climbing at a steady 10 mph on the throttle costs the pack about 139 Wh for every 1,000 feet of rise on a 4% grade and about 175 Wh on a 10% grade, on top of what the same distance takes on the flat. Raising a 180 lb rider and the 82 lb bike 1,000 feet takes about 99 Wh at the rear wheel; the motor and the pack lose the rest as heat.

The 832 Wh pack, a 180 lb rider holding 10 mph up each grade in calm air. At 10 mph the 36/18 gear asks 70 pedal strokes a minute, inside the band riders choose, so the easy-pedaling column is printed at every grade.

On a steep grade the model's pace drops rather than stopping. The fastest steady speed it holds on the throttle alone:

Throttle only, calm air, the 82 lb bike plus the weight shown. Each figure is the fastest steady speed at which the model's motor, limited to Eunorau's 92 N·m, holds the grade.

With 180 lb aboard the bike holds 10.5 mph up a 12% street on the throttle; with the full 440 lb it holds 3.8 mph there, so plan a heavy load around the gentler streets.

Does my weight change the range?

Yes: at 12 mph on the throttle, 180 lb of rider and cargo rides 61 miles on one charge, 260 lb rides 53, and the full 440 lb rides 41.

Weight costs most on the climb column. At 10 mph up 8% the model carries 130 lb for 13 miles on a charge; from 350 lb the motor can no longer hold 10 mph on that grade, and the climb table's 7.8 mph at 440 lb is the pace to plan on.

Rider and cargo on the 82 lb bike, the 832 Wh pack, calm air. "Past the model's motor" marks a climb the model cannot hold at 10 mph with the load shown.

Does cold weather drain the battery?

Yes, by degrees: the 61-mile ride at 12 mph shortens to about 48 at 32 °F and about 44 at 14 °F. At 32 °F the cells deliver about 89% of the energy they give at 77 °F, the air is 9% denser and the tires roll 18% harder (Rothhämel, 2023).

12 mph on the throttle, a 180 lb rider on level pavement, the 832 Wh pack. The central column follows McMaster University's LG HG2 cell measurements with the cells at air temperature; the brackets at 32 °F and 14 °F span the other published cell data (Limitations).

Do the tires cut range?

Less than speed does: across the fat tires Bicycle Rolling Resistance measured on its drum, the 12 mph ride runs from 56 to 73 miles, with 61 at the median. The CST 20 × 4.0 on this bike has no drum figure of its own, so the model takes the median of the ten fat tires the lab rolled and brackets it with the fastest and the slowest; all ten are 26 × 4.00, a larger size.

Level pavement, a 180 lb rider on the throttle, the 832 Wh pack. The lab ran each 26 × 4.00 tire at 12 psi under 42.5 kg at 29 km/h, and each wattage converts to the rolling resistance in the first column.

Eunorau's 100 miles, as rides

Eunorau prints "Up to 100 Miles with Dual Battery". With the 17 Ah second pack in its spec rows (1,716 Wh in all), the model covers 100 miles at a steady 15.4 mph on the throttle, 17.2 Wh a mile; with the 21 Ah pack its highlight names (1,924 Wh), at 17.1 mph, 19.2 Wh a mile. Both are a 180 lb rider on level ground in calm air (Eunorau's page).

Eunorau adds "under ideal conditions" in its description, and the model's two 100-mile rides fit those words: a steady pace with no stops, a flat road, mild air and a 180 lb rider. The weight, cold and hills tables above show what each departure costs.

The standard pack alone covers 61 miles at 12 mph. Plan on 85% of your row and keep the rest in the pack: 61 miles at 12 mph become 52, and 40 at 18 mph become 34.

How the range tables are computed

Each row starts from the power the wheels need to hold one steady speed, in the road-power equation Martin and colleagues validated against road measurements in 1998:

Wheel power = v × [ m × g × (Crr × cos θ + sin θ) + ½ × ρ × CdA × v² ]

Here v is the speed, m the rider, cargo and bike together, g gravity, θ the angle of the grade, Crr the rolling resistance (0.0105 means a drag of 1.05% of the weight on the tires, the median fat tire on the lab's drum), ρ the air's density and CdA the drag area of rider and bike.

Four steps carry that wheel power back to the cells:

1. Your pedaling reaches the rear wheel through the chain at 97.7% (Martin et al., 1998), and the rear hub motor makes up the difference.
2. The motor takes its curve from one with published figures, Bafang's RM G0H0: 510 rpm unloaded, 426 rpm at the rated point, "≥ 80" percent efficient. The model sets that curve at the FLASH LITE ST's 52 V and 750 W, fits the unloaded speed at 21.7 mph so a 180 lb rider on the throttle tops out at Eunorau's 20 mph, and caps the torque at Eunorau's 92 N·m.
3. The pack loses part of its energy inside itself; on the 48 V pack Arango, Lopez and Ceren measured, that comes to 3.1% at 12 mph on the throttle.
4. Watt-hours a mile are the cells' watts divided by the speed, and miles are the 832 Wh, reduced for what cold takes from the cells, divided by the watt-hours a mile.

A worked example: a 180 lb rider holding 12 mph on the throttle over level pavement. The tires take 65.9 W and the air 58.5 W, 124.4 W at the rear wheel.

At 12 mph the 23.98-inch rear wheel turns 168.2 times a minute. The motor model (1.630 N·m per amp, a 0.475 Ω winding and 0.76 A drawn unloaded, each derived from Bafang's published figures at 52 V) gives 7.1 N·m on 5.1 A, 78% efficient at this light load.

The motor draws 158.6 W and the cells, once the pack's own losses are added, supply 163.6 W: 13.6 Wh a mile at 12 mph. Unrounded that is 13.63, and 832 ÷ 13.63 gives 61.0 miles, or 51.9 with 15% kept.

The model checked against the figures it was built from:

Martin and colleagues' own case (Appendix I: 90 kg on a 0.3% grade at 8.36 m/s) and the RM G0H0's rated point from Bafang's workbook.

What the 440 lb payload covers

Eunorau rates the FLASH LITE ST for a 440 lb total payload, and in its own guide Eunorau defines payload this way: "Payload covers the rider and anything carried on the bike itself." So the 440 lb is you plus everything aboard, and the bike's own 82 lb sits outside it.

Say a 200 lb rider carries 60 lb in a rear basket: 260 lb, which leaves 180 lb of the rating free. At 12 mph on the throttle that ride covers about 53 miles on one charge, against 61 for a 180 lb rider alone (the weight table).

A second person counts inside the 440 lb, and whether a passenger may ride is your state's rule. California's code is one example: a passenger rides "upon or astride a separate seat attached thereto", and one "four years of age or younger, or weighs 40 pounds or less" needs a seat that holds them in and guards them from the moving parts (Cal. Veh. Code § 21204(b)). Read your own state's code before carrying anyone.

Will the FLASH LITE ST fit you?

Eunorau lists riders from 4'8" to 6'4" and prints two heights that decide the fit: the bench seat's top, 31.5 inches off the ground, and the frame's low point, 17.5 inches up. In the US Army's ANSUR II survey, 58 of 100 riders at 5'6" can stand flat-footed astride that bench, and every rider modeled from 5'10" up can.

Below 5'6" most riders do what the step-through is shaped for: slide forward off the bench at a light and stand over the low frame, 17.5 inches up. At 5'0" that frame clears 95 of 100 riders by 9.6 inches or more.

The tables put the survey's 6,068 measured bodies against Eunorau's printed figures at each height from 5'0" to 6'4".

Three steps to your own fit:

1. Measure your inseam barefoot or in socks: back to a wall, a hardback book pulled up snug between your legs, floor to the book's top edge.
2. Find your height in the stop table and read whether you stand astride the bench flat-footed or step forward over the frame; an inseam longer than your row's reads like the row above.
3. Sit on the bench and do the heel check from the setup section on the first ride, and choose where along the bench you sit.

How high should the saddle go?

The formula puts a saddle 109% of your inseam above the pedal axle, and for the median rider at each height that works out to 24.3 inches from the crank axle at 5'0" and 34.3 inches at 6'4". Published practice runs from 106% to 110.4% (Ferrer-Roca et al., 2012), and the table gives both ends beside the 109% of Peveler et al., 2005.

The crank-axle figure comes from subtracting Eunorau's 170 mm crank arm from the pedal-axle distance.

The distance the formula sets from the center of the crank axle to the top of the seat, for the median rider at each height, at 109%, 106% and 110.4% of inseam. ANSUR II bodies, women and men together; the inseam column spans the 5th to the 95th percentile at each height.

The FLASH LITE ST's seat is a long bench, and Eunorau prints one height for it, 31.5 inches to the ground ("D: Seat height 800mm/31.5in"), with no range and no crank-axle height (Eunorau's geometry rows). Without the crank-axle height, the bench cannot be placed against your row, so your own leg gives the answer: the heel check in the setup section.

The bench gives you a setting a post does not: where along it you sit. In Eunorau's side photograph the crank axle sits ahead of the bench's front edge, so sliding back carries your hips farther from the pedals and opens the knee, and sliding forward brings them closer.

Can I put a foot down at a stop?

From 5'10" up, every rider modeled stands flat-footed astride the 31.5-inch bench; at 5'6" it is 58 of 100 and at 5'4" 16 of 100. The table sets each rider's barefoot inseam against the bench height Eunorau prints:

Inseam minus the printed 31.5-inch seat height for the median rider at each height, and the riders of 100 whose barefoot inseam reaches it, standing astride the bench with both feet flat. Shoes add their soles to every figure.

Shorter riders stop the way a step-through invites: forward off the bench, feet down either side of the 17.5-inch frame. Eunorau's launch post says as much: the design "makes the bike particularly friendly for shorter riders, commuters navigating busy intersections". The frame's clearance at each height:

Barefoot inseam minus Eunorau's printed "E: Stand-Over height 445mm/17.5in" for the 5th-percentile rider at each height, the clearance 95 of 100 riders at that height have or exceed.

Will I feel cramped, or stretched out?

The bars rise to meet you: Eunorau's cockpit rows list a 720 mm aluminum riser bar with 215 mm of rise and 9° of backsweep on a 40 mm stem with 10° of rise. Its geometry rows print the handlebar height as "108mm/42.5in", and 42.5 inches, which is 1,080 mm, puts the bar about 11 inches above the 31.5-inch bench top (the conflicts table sets out the two figures).

Eunorau publishes no grip position relative to the bench, and neither image could be scaled to measure one (Limitations), so the lean is not computed. Where you sit on the bench is the adjustment you have: slide forward and the grips come closer, slide back and your arms reach farther.

How much weight goes on my hands?

Your hands carry whatever part of your trunk leans out ahead of the bench, so the more upright you sit, the less they hold; no grip position is published, so the hand load is not computed here. As a yardstick from the other end of the scale, ten road racers riding on the hoods put 15% of their weight through the stem (Carahalios, 2015).

If your palms tingle on a long ride, sit a little farther forward on the bench so your arms bend: a more upright trunk shifts more of the body's weight onto the seat (Clauser et al., 1969 measured each segment's share). Padded gloves lowered the pressure over the ulnar nerve by 10 to 28% in 36 experienced cyclists (Slane et al., 2011).

How do I set the saddle when it arrives?

Sit on the bench, rest a heel on the lower pedal and look at that leg: just straight means your pedaling position is close; bent well short of straight means sit farther back.

With the ball of the foot on the pedal the knee should then keep a bend of 25 to 35 degrees at the bottom of the stroke (Peveler et al., 2007). Among 19 trained cyclists the heel method landed 70% inside that range, ahead of either inseam formula (Peveler et al., 2005).

Find the spot on the bench where the heel check comes out right, ride from there, and slide forward whenever you want your feet nearer the ground.

How we computed fit

The first table is one rule applied to every body: 109% of inseam above the pedal axle, minus the 170 mm crank for the distance from the crank axle. The stop tables subtract Eunorau's two printed heights from each rider's barefoot inseam.

Worked through for a 5'8" rider with the survey's median inseam for that height, 32.6 inches: 35.6 inches above the pedal axle, and 28.9 inches above the crank axle with the crank taken off, where the LeMond method (88.3% of inseam) gives 28.8. Astride the bench, the same rider has 1.1 inches to spare; over the low frame, 15.1.

Run over the whole survey, the LeMond method plus a 170 mm crank lands at 109.0% of inseam from the pedal, beside the 109.2 ± 0.9% measured in trained cyclists (Peveler et al., 2005).

Eunorau's geometry drawing, scaled by its wheelbase or its total length, lands one other printed row within 3.5%, and its square-on studio photograph, scaled by the wheelbase or the seat height, lands two; so no crank-axle height, seat angle, grip position, lean or hand load is measured from either (Limitations).

The Mercer fit test

We set every machine we review against one family, the Mercers; each verdict reads a figure Eunorau prints or the fit tables' row at that person's height.

The inputs: Eunorau's 4'8"–6'4" window, the 31.5-inch bench and 17.5-inch standover, the 440 lb payload, the 82 lb weight, and the law in the next section.

Frank, Cole and Jack stand flat-footed astride the bench, and so do most riders Dana's height; Ruth and Maya are the riders the low frame was drawn for, stepping forward over it at a stop whenever their inseam falls short of the bench. Everyone does the heel check from the setup section on the first ride.

What the law calls it: 750 W, a throttle and 20 mph

On September 30, 2026 we set the FLASH LITE ST's printed figures against the electric-bicycle definition of every state and the District of Columbia; they sit inside 28, and inside 29 from October 1.

The figures are a 750 W motor, a throttle and 20 mph. Most of the definitions that leave them out turn on the word that bounds the motor: "not more than" 750 watts takes a 750 W motor in, and "less than" 750 watts leaves it out.

Twenty jurisdictions write the exclusive word through September 30; New Jersey's definition admits assistance only while the rider pedals, so a throttle sits outside it; and Alaska and Kentucky define no electric bicycle at all. On October 1, 2026 Connecticut's amended definition moves to a motor of not more than 750 watts (P.A. 26-24 § 26), and the count inside becomes 29.

The 21 jurisdictions whose definitions leave out the FLASH LITE ST's printed figures on September 30, 2026, each in its statute's own words, from our 51-jurisdiction rule table; Connecticut's row carries both dates.

Outside a state's definition, the state's code governs the bike as whatever other vehicle it names, and the statute in each row shows where to read which. Our state guide links each state's own page.

In the three-class states, a throttle that carries the bike to 20 mph and stops there is the Class 2 wording. California's reads: a motor "that may be used exclusively to propel the bicycle, and that is not capable of providing assistance when the bicycle reaches the speed of 20 miles per hour" (Cal. Veh. Code § 312.5(a)(2)).

What "Class 1/2/3/3C/4, Default: Class 2" means here

The FLASH LITE ST's spec rows print its pedal assist as "Class 1/2/3/3C/4, Default: Class 2" beside a "Maximum Speed 20 MPH" and a thumb throttle, and its FAQ adds: "Mode availability and permitted speeds depend on local laws." This review screens the bike as Eunorau ships it, at the printed 20 mph, which California's wording above reads as Class 2.

The state codes define Classes 1, 2 and 3 (California's § 312.5 is one); a setting that assists past 20 mph leaves the Class 2 wording, and your state's definition is the one to read before you change the default.

Charging and battery care

The FLASH LITE ST ships with a 2.0 A charger, and Eunorau's FAQ for the bike says the 52V 16Ah pack "typically requires approximately 8–10 hours for a complete charge". Our arithmetic agrees: 16 Ah at 2 A is 8 hours of full current before the charger slows near the top.

Most days refill far less. A 20-mile ride at 12 mph on the throttle takes about 270 Wh from the cells (the speed table), about a third of the 832 Wh pack.

The same FAQ says the pack "can be removed and charged indoors, or charged while installed on the bike". Eunorau lists a "50A BMS with Discharge Fuse" inside it, and a "Dual-Input Battery Switcher" for the optional second pack.

Eunorau's general FAQ asks you to recharge while 10 to 15% remains and to store a pack left longer than two weeks "in a cool, dry place with a 70%-80% charge remaining"; it says Eunorau batteries "typically last 5-6 years" and "will still deliver more than 80% of their original capacity after 500 charge cycles".

Where Eunorau prints a figure two ways

Eunorau describes the FLASH LITE ST on its product page, in its product record, in the listings for its add-on packs and in its FAQs. Where two of those differ, the last column gives the figure this review uses.

Eunorau's page and record as read on September 26 and again on September 30, 2026, with no change between the two reads; the pack listings, the FAQs and the warranty policy read on September 30.

Has it been recalled?

Neither Eunorau nor the FLASH LITE ST appears in a federal recall. On September 30, 2026 both names went through the description and product name fields of the CPSC's recall database, each shown answering by a control query, and each of the 51 recalls whose titles name an electric bicycle, an e-bike or an electric scooter was read for Eunorau.

The CPSC's warning listing held 373 rows on September 30, 2026: two name a control brand, and none names Eunorau or the FLASH LITE.

Is it UL certified?

Eunorau's FLASH LITE ST page marks the model "UL CERTIFIED: Yes" in its highlights. Two standards cover an e-bike's electrics: UL 2849, for the whole electrical system, and UL 2271, for the battery. If a landlord, a building manager or an insurer asks to see the certificate, note it on your order and we will request it from Eunorau.

Warranty, and who handles a claim

Coverage by part under Eunorau's warranty policy, read on September 30, 2026:

Eunorau Bikes, "a Nevada corporation", issues the policy, which covers US purchases from August 1, 2023 against manufacturing defects in the parts Eunorau fitted (the policy).

Three conditions come with it (the policy): "You are the original purchaser", "Product Registration right after the purchase", and an "E-bike check-up by a Eunorau specialist or dealer after the first year of use"; wear parts and labor sit outside it. Our Eunorau brand profile sets these terms beside the rest of the range.

Buy the FLASH LITE ST from us and we run any warranty claim. Send a photo and a line about what failed; we take it to Eunorau and follow it until the part reaches you.

Buying it from us

The value case in numbers. Shop Pay turns $1,899 into 12 payments of $171.40, 6 of $330.49 or 3 of $648.89, each at 15% APR, the plans our listing offered on September 30, 2026.*

*Rates from 0-36% APR. Payment options through Shop Pay Installments are subject to an eligibility check and are provided by these lending partners: affirm.com/lenders. Options depend on your purchase amount, and a down payment may be required. State notices to consumers: affirm.com/licenses.

Choosing between the FLASH LITE ST and another FLASH? Email your height, inseam, state, what you carry and your steepest street to support@redtailebikes.com, and we will tell you plainly which one fits your riding.

The honest ledger

Green flags

• An 832 Wh pack: about 61 miles at 12 mph on the throttle for a 180 lb rider, and Eunorau's 100 miles at a steady 15.4 mph with the 17 Ah second pack (the range tables).
• A 17.5-inch standover and a 4'8" to 6'4" window, the widest in the FLASH family (the fit section).
• Four-piston hydraulic brakes on 180 mm rotors with motor cutoff levers (the parts section).
• 92 N·m from the 750 W rear hub: 13.9 mph up 8% with 180 lb aboard on the throttle alone (the climb table).
• 440 lb of rider and cargo, the bike's own 82 lb counted apart (the payload section).
• $1,899, Eunorau's own price on September 30, 2026, in two colors (buying from us).

Red flags: where it is the wrong bike, and what to do

• Riding in a state whose definition says "less than" 750 watts: a 500 W bike sits under that line; the META20 is a $1,699 folding 20-inch on 500 W (our META20 review), and your state's page in our state guide has the rest.
• Long climbs at speed, or you want to pedal fast: one gear stops helping your legs above about 14 mph; the FLASH 2.0 has eight speeds and a mid-drive (our FLASH 2.0 review).
• Stairs or a car trunk every day: at 82 lb it lives at ground level; the META20 folds and weighs 63.4 lb.
• Carrying a child: the MAX-CARGO is Eunorau's long-tail, and our MAX-CARGO review covers its child seats and the state rules on carrying children.
• You want to stay seated with both feet flat at a light and stand under 5'6": step forward over the 17.5-inch frame instead, or read the stop table for your height before ordering.
• Rough trails: Eunorau's FAQ says the tires "are not a substitute for specialized off-road tires in extreme conditions"; keep this one to pavement, gravel and firm dirt, and for trails read our FAT-HS review, Eunorau's full-suspension mid-drive.

Who should buy it

Buy the FLASH LITE ST if you want a moped-style bike you step through rather than over, a bench and a throttle for town trips at up to 20 mph, hydraulic brakes, room for 440 lb, and a state whose definition takes in a 750 W motor, for $1,899.

Take the FLASH 2.0 instead if you want gears and rear suspension and the $600 difference buys you more than the step-through does.

Skip both if your state's definition bounds the motor at "less than 750 watts" and you want to ride as an e-bike there: read our META20 review for a 500 W bike.

Before you buy: the checklist

Eight checks: the first four decide whether the FLASH LITE ST is your bike, and the last four get the order and the first week right.

• ☐ Look up your state's e-bike definition and its word for the motor, "less than" or "not more than" 750 watts; our state guide is the place to start.
• ☐ Measure your inseam in socks and find your row in the stop table: flat-footed astride the 31.5-inch bench, or stepping forward over the 17.5-inch frame.
• ☐ Add up rider, cargo and passenger against the 440 lb; the 82 lb bike sits outside it.
• ☐ Check your parking spot and route for an 82 lb, 68.5-inch bike; plan a ramp for any steps.
• ☐ Plan your longest ride at 12 mph on the throttle: one charge plans 52 miles for a 180 lb rider on the flat.
• ☐ A full charge from empty takes 8 to 10 hours on the 2.0 A charger, so plan the first night around it.
• ☐ Do the heel check on the bench on the first ride and find the spot where your knee keeps a slight bend.
• ☐ Look the carton over before the driver leaves, and if anything is damaged, send us photos within 48 hours.

Limitations of this review

Twenty limits on this review, each numbered and tied to the section it qualifies.

1. The FLASH LITE ST's specifications are Eunorau's figures from its page, record, FAQs and pack listings, recomputed wherever arithmetic enters. The exceptions are our range and fit models, the jurisdiction screen and our store terms, set out below.
2. Every range row is one steady speed on one grade in still air. Stops, starts and headwinds cost more, and town riding stops often; a tailwind costs less.
3. Eunorau prints the second pack, the handlebar height, the charging time and the warranty more than one way (the conflicts table); the review works from the figure named there.
4. The charging figures are Eunorau's, beside our arithmetic from the 16 Ah pack and the 2.0 A charger, which leaves out the charger's slowdown near full.
5. The jurisdiction screen sets the printed 750 W, throttle and 20 mph beside each definition as our rule table and the statutes stood on September 30, 2026, with Connecticut's amendment of October 1 applied from that date. It reads the definitions only, leaves age, helmet and passenger rules to each state, and is not legal advice.
6. The screen reads the bike as shipped, in Eunorau's default Class 2 setting. Eunorau's other class settings are not screened.
7. The recall screens ran on September 30, 2026 on the fields of the CPSC database set out in the recalls section, each shown working by a control query; the title field did not answer the FLASH LITE queries that day (the provider returned an error, its control query included), so it is left out rather than read as empty. A search of recall titles is a floor, not the whole database, since a recall titled by a brand name alone escapes it; the warning listing's 373 rows were read the same day.
8. Our price, orderability and Shop Pay terms come from our own listing; the payments are its plan table for $1,899 at 15% APR, read September 30, 2026.
9. The motor model is a comparable, not a measurement of this motor. Eunorau prints the FLASH LITE ST's 52 V, 750 W and 92 N·m in a rear hub; the curve is Bafang's RM G0H0 hub, set at the rear wheel, with the unloaded speed fitted so a 180 lb rider reaches Eunorau's 20 mph and no faster.
10. No drum or road measurement of the CST 20 × 4.0 was found, so the model assumes the median of ten 26 × 4.00 fat tires on Bicycle Rolling Resistance's drum, bracketed by the slowest and the fastest of the ten.
11. The model's wheel is the nominal 20 × 4.0 diameter, 23.98 inches. A fat tire under a rider rolls a little smaller, which raises the cadence at each speed slightly; the gear table's ceiling would arrive a little below 14.3 mph.
12. The model's drag area is the upright cruiser figure of 37 everyday riders; no field measurement of a moped-style bike with a bench was found.
13. The cold rows use McMaster's measured LG HG2 cell as the central line, bracketed by Samsung's 35E data sheet and Casado et al., 2025; Eunorau names LG cells without naming the cell model.
14. No ride of the FLASH LITE ST to empty, with its speed and load stated, was found in print, so the chain from wheel to pack is checked link by link against its sources, with no whole-ride figure to test it against.
15. The two-pack column uses the 17 Ah pack from the spec rows. With the 21 Ah pack the highlight names, the two packs hold 1,924 Wh, and the two-pack miles run about 12% higher than the column.
16. The fit tables use the bodies of US Army personnel. ANSUR II measured 6,068 soldiers aged 17 to 58 in 2010 to 2012; how inseam varies at a given height should carry over to civilians, while the exact spread may not. The survey holds fewer than 30 bodies at 4'8" and 4'10", so the tables start at 5'0".
17. The fit is the formula and Eunorau's two printed heights. Eunorau's geometry drawing, scaled by its wheelbase or its total length, reproduces at most one other printed row within 3.5%, and its square-on studio photograph, scaled by the wheelbase or the seat height, at most two; so no crank-axle height, seat angle, grip position, lean or hand load is measured, and Eunorau's rows print none of them.
18. Eunorau prints one seat height, 31.5 inches, and no adjustment range for the bench, so the fit section reads the bench at that height.
19. Treat the saddle formula as a first setting. Among 19 trained cyclists, the inseam formulas put 55 to 65% inside the 25 to 35 degree knee range and the heel check 70% (Peveler et al., 2005); finish the setting on the bike.
20. The payload section quotes California's statute as one example and does not screen every state's passenger, helmet or age rule. Expiry: re-verify if Eunorau changes the motor, pack, speed setting, payload, rider window, seat height, geometry or second-pack listings, if our price moves, or if any state's definition changes.

The source register

What this review rests on, by tier and by what each source supports: Eunorau's page, record, launch post, FAQs, pack listings and policy, the statutes, the CPSC's lists, the published measurements under both models, and our own datasets.

Frequently asked questions

Are moped-style e-bikes good?

For short trips in town, the FLASH LITE ST shows what the style offers: a bench you sit on like a scooter, a throttle to 20 mph, fat tires and a low frame to step across. You give up gears and a light bike, since it has one speed and weighs 82 lb; if you want to pedal fast or climb long hills, the family table points to the FLASH 2.0's eight speeds.

What is a moped-style e-bike?

The phrase describes an electric bicycle styled after a small moped, and Eunorau's copy for the FLASH LITE ST names the parts: a "bold round LED headlight" with a "motorcycle-inspired look", a plush extended bench and 20 × 4.0 tires. It keeps working pedals and a 750 W motor, and the law section reads it against each state's electric-bicycle definition (the law section).

Are e-bikes mopeds?

Not where your bike fits the state's e-bike definition: each definition sets its own limits on the motor, the speed and how the assist works. Outside the definition, the state's code governs the machine as whatever other vehicle it names; for your FLASH LITE ST, the law table lists the 21 jurisdictions whose definitions leave its printed figures out on September 30, 2026.

Is the FLASH LITE ST good for short riders?

Eunorau lists riders from 4'8", and the 17.5-inch frame is what a short rider stands over at a light: at 5'0" it clears 95 of 100 riders in the Army's survey by 9.6 inches or more. Standing flat-footed astride the 31.5-inch bench takes an inseam of 31.5 inches, so below about 5'6" you will step forward over the frame at a light (the stop table).

Is the FLASH LITE ST good for tall riders?

Eunorau's window runs to 6'4", and every rider modeled from 5'10" up stands flat-footed astride the bench. For pedaling, the formula asks 34.3 inches from the crank axle at 6'4"; do the heel check on the first ride and pick your spot on the bench from it (the setup section).

Does the seat adjust?

Eunorau prints one seat height for the bench, 31.5 inches to the ground, and no adjustment range. What you can choose is where you sit along it: in Eunorau's side photograph the crank axle sits ahead of the bench's front edge, so sitting farther back puts more distance between your hips and the pedals (the saddle section).

Can the FLASH LITE ST carry a passenger?

Eunorau describes the bench as having "extra room for a passenger when needed", and the 440 lb payload covers you, a passenger and cargo together. Whether a passenger may ride is your state's rule; California's § 21204(b), for one, asks for "a separate seat attached thereto" (the payload section).

How far does the FLASH LITE ST go on a charge?

About 61 miles at 12 mph on the throttle from the 832 Wh pack if you weigh 180 lb and ride flat pavement, and about 40 at 18 mph. Keeping 15% in reserve, your 12 mph plan is 52 miles, and with the full 440 lb aboard the 12 mph ride comes to about 41 (the range tables).

How does the dual battery work?

Eunorau's FAQ says the optional second pack "connects through a dual-battery switching system, increasing the available energy for longer journeys", and its spec rows list a "Dual-Input Battery Switcher". With the 17 Ah second pack, the model plans 107 miles at 12 mph for a 180 lb rider on the flat, keeping the top of the 10 to 15% the FAQ says to recharge at (the speed table).

How long does it take to charge?

Eunorau's FAQ for the bike gives "approximately 8–10 hours" for a full charge on the 2.0 A charger it ships with. Your usual ride takes far less: 20 miles at 12 mph uses about 270 Wh of the 832 Wh pack (the charging section).

Is the battery removable?

Yes: Eunorau's FAQ says the pack "can be removed and charged indoors, or charged while installed on the bike". It rides in the case under your bench, which also carries the rear light (the frame section).

How much does the Eunorau FLASH LITE ST weigh?

82 lb, Eunorau's "Bike Weight" row. Your payload of 440 lb is counted on top of that, and the weight table prices the range at every load from 100 lb to 440 (the weight table).

Is it good for heavy riders?

Eunorau rates it for 440 lb of rider and cargo, and in the model a 260 lb rider covers about 53 miles at 12 mph on the throttle. On an 8% grade your 260 lb holds 11.4 mph on the throttle alone, and the climb table gives each load its pace (the hills section).

How fast does a Class 2 e-bike go?

The Class 2 wording stops the motor's help at 20 mph: California's code describes a motor "not capable of providing assistance when the bicycle reaches the speed of 20 miles per hour". Your FLASH LITE ST prints a "Maximum Speed 20 MPH" and ships in its Class 2 default (the law section).

Can a Class 2 e-bike go 28 mph?

Not on its motor: past 20 mph the Class 2 wording no longer describes it, and 28 mph is the Class 3 line, a motor that "ceases to provide assistance when the bicycle reaches the speed of 28 miles per hour" (Cal. Veh. Code § 312.5(a)(3)). Your FLASH LITE ST ships in Class 2, and Eunorau's FAQ says "permitted speeds depend on local laws" (what the class label means).

Do you need a license for a Class 2 e-bike?

That turns on your state's definition. Where it takes in the FLASH LITE ST's 750 W, throttle and 20 mph, your state's e-bike rules apply; where it does not, the state's code governs the bike as another vehicle, and the statute in the law table shows which.

How old do you have to be to ride it?

Your state sets the age. California, for one, closes Class 3 to riders "under 16 years of age" in § 21213(a) and requires every bicycle rider under 18 to wear a helmet in § 21212(a); our state guide links your state's own page.

Are Eunorau bikes good?

Eunorau names its parts and publishes its terms: on the FLASH LITE ST, LG cells, a 52V 22A sine-wave controller, four-piston hydraulic brakes, a 10-year frame warranty and a "UL CERTIFIED: Yes" mark. Our Eunorau brand profile covers the full range.

Where are Eunorau bikes made?

Eunorau's FAQ says its bikes are "designed in the U.S. and manufactured in Shanghai", with a team there "overseeing quality control and inspecting every bike before it is shipped to our customers".

The bottom line

The Eunorau FLASH LITE ST is a 750 W moped-style step-through with one gear and an 832 Wh pack, rated to 440 lb: a $1,899 bike on 20 × 4.0 fat tires with four-piston hydraulic brakes, a long bench seat and a 17.5-inch standover, inside the e-bike definitions of 28 of 51 jurisdictions, and 29 from October 1, 2026.

A 180 lb rider gets about 61 miles at 12 mph on the throttle, 40 at 18, and 41 at 12 mph with the full 440 lb aboard.

Buy it for town rides on a bench, stops where you step across a low frame, and one bike for riders from 4'8" to 6'4", the window Eunorau lists. If your state says "less than 750 watts", read our META20 review first. Our fat tire e-bike guide picks it in three of its seven rows: easy step-through access, commuting and errands, and carrying the most weight.

References

The documents behind this page's figures and rules, numbered by where the page first relies on each, with the publisher, the title, the part cited and the date it was read.

1. Eunorau. FLASH LITE ST 1.0 — product page and product record: highlights, specification and geometry rows, the feature copy, the product FAQ and the gallery. eunorau-ebike.com/products/flash-lite-st; product record flash-lite-st.json. Retrieved September 26, 2026 and re-read September 30, 2026 with no change to any row; deposit copies archived.
2. Eunorau. Introducing the New Eunorau FLASH LITE ST (blog post, November 21, 2025). eunorau-ebike.com/blogs/news. Retrieved September 30, 2026; deposit copy archived.
3. Eunorau. FLASH LITE ST geometry drawing (a side silhouette with dimension lines A to G), published as the image in the page's Geometry tab. eunorau-ebike.com/products/flash-lite-st. Retrieved September 26, 2026; deposit copy archived, and its dimension lines measured September 30, 2026.
4. Eunorau. FLASH LITE 2.0, FLASH AWD 1.0 and FLASH 2.0 product pages and records: the frame, motor, drivetrain, geometry and rider-height rows, and the prices. flash-lite-2-0; flash-awd-1-0; flash-2. Retrieved September 26, 2026 and re-read September 30, 2026 with no change; deposit copies archived.
5. Eunorau. Hunting Ebike Trailer Guide: How Much Gear Can You Tow (blog post, May 31, 2026): "Payload covers the rider and anything carried on the bike itself." eunorau-ebike.com/blogs/news. Retrieved September 24, 2026; deposit copy archived.
6. California Legislative Information. Cal. Veh. Code § 21204, subsection (b). leginfo.legislature.ca.gov. Read September 30, 2026 through a text proxy of the code page; deposit copy archived. Amended by Stats. 2009, Ch. 594 (SB 527), effective January 1, 2010.
7. California Legislative Information. Cal. Veh. Code §§ 21212 and 21213, subsections (a): the helmet rule for riders under 18 and the Class 3 age limit. § 21212; § 21213. Read September 30, 2026 through a text proxy of the code pages; deposit copies archived. § 21213 added by Stats. 2015, Ch. 568 (AB 1096), effective January 1, 2016.
8. Connecticut General Assembly. Public Act 26-24, § 26, amending C.G.S. § 14-1 so that an electric bicycle's motor is "not more than" 750 watts, effective October 1, 2026. cga.ct.gov. Read August 30, 2026; deposit copy archived.
9. The state legislatures of Alabama, Arkansas, Arizona, Connecticut, Florida, Idaho, Illinois, Kansas, Louisiana, Maine, Missouri, Mississippi, New Hampshire, New Jersey, New York, Ohio, Tennessee, Texas, Vermont, West Virginia and Wyoming. Each state's electric-bicycle definition, at the section linked in this page's law table, with its own boundary word for the motor or, for New Jersey, its assist rule. Read for the boundary-word census of September 24, 2026 and re-screened September 30, 2026.
10. Alaska State Legislature. AS 28.90.990(a)(20)-(22). akleg.gov. Retrieved September 26, 2026. No electric-bicycle definition.
11. Kentucky Legislature. KRS 189.010. apps.legislature.ky.gov. Retrieved September 26, 2026. No electric-bicycle definition.
12. Redtail eBikes editorial desk. The 51-jurisdiction rule table, its boundary-word census, and the FLASH LITE ST screen. Every US state and DC, each row carrying its statutory citation and each wattage read with the statute's own word; screened September 30, 2026 on the published 750 W, throttle and 20 mph: inside the definition in 28 jurisdictions, outside it in 21, and no definition in Alaska and Kentucky; 29 inside from October 1, 2026 under reference 8. First-party dataset.
13. California Legislative Information. Cal. Veh. Code § 312.5, subsection (a)(2), the Class 2 wording. leginfo.legislature.ca.gov. Retrieved September 26, 2026.
14. Eunorau. EUNORAU EBIKES FAQ: battery life ("5-6 years"; "more than 80% of their original capacity after 500 charge cycles"), the 10-15% recharging and 70%-80% storage advice, the 3-8 hour charging range, and where the bikes are made. eunorau-ebike.com/pages/faqs. Retrieved September 26 and 30, 2026; deposit copies archived.
15. Eunorau. EUNORAU 52V17Ah Third Battery for FLASH Ebike ($599; its "Compatible with" list names the FLASH and the FLASH Lite ST; top tube type) and EUNORAU 52V21Ah Secondary Battery for FLASH Ebike ($699; application bike "Eunorau Flash"; down tube type), product pages and records. 17 Ah; 21 Ah. Retrieved September 30, 2026; deposit copies archived.
16. U.S. Consumer Product Safety Commission. SaferProducts recall database. saferproducts.gov/RestWebServices/Recall. Screened September 30, 2026 for "Eunorau" and "FLASH LITE" on the RecallDescription and ProductName fields, each proved live by a control query, and for "Eunorau" across the 51 recalls whose titles carry one of eight electric-bicycle, e-bike or electric-scooter terms, unioned; screens archived.
17. U.S. Consumer Product Safety Commission. Product safety warning listing (complete CSV). cpsc.gov. Read September 30, 2026: 373 warnings, 2 naming the control brand, none naming Eunorau or the FLASH LITE; deposit copy and screen archived.
18. UL Standards & Engagement (standards body; context only). UL 2849 and UL 2271. Retrieved August 29, 2026.
19. Eunorau Bikes. 24-Month+ Limited Warranty: coverage periods, requirements, exclusions and the issuing entity. eunorau-ebike.com/pages/warranty. Retrieved September 26 and 30, 2026; deposit copies archived.
20. Redtail eBikes. FLASH LITE ST store record (redtailebikes.com/products/eunorau-flash-lite-st): the two colors, price, orderability and the Shop Pay plan table; the FLASH family, META20 and MAX-CARGO prices; and our shipping policy. Read September 30, 2026.
21. Affirm. Lending partners. affirm.com/lenders. The lenders behind Shop Pay's installment plans, named in Shopify's installment terms.
22. Bafang. Workbook OEM 2021, MOTORS table, RM G0H0 column: rated voltage, n0, nT, maximum torque and efficiency. bafang-e.com. Retrieved September 23, 2026; deposit copy archived.
23. Martin, J. C., Milliken, D. L., Cobb, J. E., McFadden, K. L. and Coggan, A. R. Validation of a Mathematical Model for Road Cycling Power. Journal of Applied Biomechanics 14(3):276–291 (1998), Eq. 14 and Appendix I; doi 10.1123/jab.14.3.276. collections.lib.utah.edu. Retrieved September 23, 2026.
24. Tengattini, S. and Bigazzi, A. Y. Physical characteristics and resistance parameters of typical urban cyclists. Journal of Sports Sciences 36(20):2383–2391 (2018), Table 4 (drag area by bicycle type); doi 10.1080/02640414.2018.1458587. civil-reactlab.sites.olt.ubc.ca. Retrieved September 23, 2026.
25. Arango, I., Lopez, C. and Ceren, A. Improving the Autonomy of a Mid-Drive Motor Electric Bicycle Based on System Efficiency Maps and Its Performance. World Electric Vehicle Journal 12(2):59 (2021), Eq. (40); doi 10.3390/wevj12020059. mdpi-res.com. Retrieved September 23, 2026.
26. Marsh, A. P. and Martin, P. E. Effect of cycling experience, aerobic power, and power output on preferred and most economical cycling cadences. Medicine and Science in Sports and Exercise 29(9):1225–1232 (1997); doi 10.1097/00005768-199709000-00016. pubmed.ncbi.nlm.nih.gov. Abstract retrieved September 30, 2026 through NCBI E-utilities; deposit copy archived.
27. Bicycle Rolling Resistance. Fat-bike tire tests (ten 26 × 4.00 tires on the drum at 12 psi). bicyclerollingresistance.com. Retrieved September 25, 2026; deposit copy archived.
28. Kollmeyer, P. et al. LG 18650HG2 Li-ion Battery Data. Mendeley Data v2, McMaster University; doi 10.17632/b5mj79w5w9.2 (0.5C discharge files, recomputed). doi.org. Retrieved September 23, 2026.
29. Samsung SDI. Specification of Product INR18650-35E, Ver. 1.1 (July 9, 2015), § 7.5 Temperature Dependence of Discharge Capacity. enerpower.de. Retrieved September 23, 2026.
30. Casado, S. et al. Evaluation of commercial Li-Ion 18650 battery cells for deep space applications. Journal of Power Sources 638:236552 (2025), Table 3; doi 10.1016/j.jpowsour.2025.236552. doi.org. Retrieved September 23, 2026.
31. NOAA, NASA and US Air Force. U.S. Standard Atmosphere, 1976 (NOAA-S/T 76-1562), sea-level pressure and the composition of dry air. ntrs.nasa.gov. Retrieved September 23, 2026.
32. Rothhämel, M. On rolling resistance of bicycle tyres with ambient temperature in focus. International Journal of Vehicle Systems Modelling and Testing 17:67–80 (2023), Tables 1 and 4; doi 10.1504/IJVSMT.2023.132317. inderscience.com. Retrieved September 23, 2026.
33. Sheldon Brown and John Allen (Harris Cyclery). Tire Sizing Systems, the ISO/E.T.R.T.O. chart: "20 x 1.5-20 x 2.125 | 406 mm". sheldonbrown.com. Retrieved September 28, 2026; deposit copy archived.
34. U.S. Army Natick Soldier Research, Development and Engineering Center. 2012 Anthropometric Survey of U.S. Army Personnel (ANSUR II), public data release (4,082 men, 1,986 women). army.mil. Retrieved September 25, 2026.
35. Peveler, W., Bishop, P., Smith, J., Richardson, M. and Whitehorn, E. Comparing Methods for Setting Saddle Height in Trained Cyclists. Journal of Exercise Physiology Online 8(1):51–55 (2005). asep.org. Retrieved September 25, 2026.
36. Ferrer-Roca, V., Roig, A., Galilea, P. and García-López, J. Influence of saddle height on lower limb kinematics in well-trained cyclists: static vs. dynamic evaluation in bike fitting. Journal of Strength and Conditioning Research 26(11):3025–3029 (2012). pubmed.ncbi.nlm.nih.gov. Retrieved September 25, 2026.
37. Carahalios, A. An Analysis of the Bicycle-Rider Interface Forces in Stationary Road Cycling. MS thesis, University of Colorado (2015). scholar.colorado.edu. Retrieved September 25, 2026.
38. Clauser, C. E., McConville, J. T. and Young, J. W. Weight, Volume, and Center of Mass of Segments of the Human Body, AMRL-TR-69-70 (1969). ntrs.nasa.gov. Retrieved September 25, 2026.
39. Slane, J., Timmerman, M., Ploeg, H. L. and Thelen, D. G. The influence of glove and hand position on pressure over the ulnar nerve during cycling. Clinical Biomechanics 26(6):642–648 (2011). pubmed.ncbi.nlm.nih.gov. Retrieved September 25, 2026.
40. Peveler, W. W., Pounders, J. D. and Bishop, P. A. Effects of saddle height on anaerobic power production in cycling. Journal of Strength and Conditioning Research 21(4):1023–1027 (2007). pubmed.ncbi.nlm.nih.gov. Retrieved September 25, 2026.
41. Redtail eBikes editorial desk. FLASH LITE ST range model. The computation set out in the range section of this review: Martin et al.'s power model with Bafang's RM G0H0 shape set to Eunorau's 52 V, 750 W, 92 N·m and 20 mph at the rear wheel, on a 23.98-inch 20 × 4.0 wheel and the median of ten fat tires, with the 36/18 gear's cadence held to Marsh and Martin's 100 rpm; run September 30, 2026. First-party computation; every input and its source in its inputs table.
42. Redtail eBikes editorial desk. FLASH LITE ST fit model and geometry reads. Every ANSUR II body through the saddle formula at Eunorau's 170 mm crank, and each body's barefoot inseam against Eunorau's printed 31.5-inch seat height and 17.5-inch standover; Eunorau's geometry drawing and its square-on studio photograph, each read at two scales, reproduced at most one and two other rows within 3.5% and were not used for any measurement; September 30, 2026. First-party computation; every input and its source in its inputs table.