52V 1000 W · 220 N·m · 832 Wh in the box · 2,808 Wh fully loaded · 20 mph · 440 lb payload · $2,499 · ridden in fall mud and rain · verified September 19, 2026

Quick Answer — The Eunorau FLASH 2.0 is a $2,499 full-suspension moto-style e-bike with a 52V 1000 W mid-drive rated at 220 N·m, limited to 20 mph as shipped. We rode it in fall mud and rain: buy it if distance is your problem and you want the three battery bays. The 220-mile headline needs $1,298 of extra packs.

The part nobody has published: the 220-mile claim and the 65-mile claim rest on the same energy assumption, 12.8 watt-hours per mile — which is within 3% of the median assumption across 97 bikes on our own shelf. Eunorau scaled its small number honestly. Whether anyone rides at 12.8 Wh/mi is the question this review is about.

Both colorways were orderable on our store on September 19, 2026, at the same $2,499 Eunorau charges. Ships free to the lower 48, we file the freight claim if it arrives damaged, and we run any warranty claim for you. Prefer the pale finish? Buy it in Lunar Dust instead.

Buy it in Moon Black — $2,499

Takeaway

  • We rode it, in fall mud and fall rain, and it matched its paperwork. The torque-sensor assist and the shift detection do their job, the frame and welds are better than photographs suggest, and the long saddle fits two people. Both videos are on this page.
  • The 220-mile figure is internally consistent, and that is the surprise. Three packs hold 2,808 Wh; 2,808 ÷ 220 = 12.76 Wh/mi. The single-pack claim works out at 12.80. A maker inflating its flagship number would have made the big one look better than the small one. This one did not.
  • 12.8 Wh/mi is the industry's normal assumption, so the skepticism belongs to the whole shelf. We measured every range claim on our own site: of 207 live e-bikes, 97 publish a battery and a range that belong together, and their median implied consumption is 12.48 Wh/mi. The FLASH 2.0 sits at the 53rd percentile.
  • The miles you buy get cheaper as you add packs. The bike gives 65 claimed miles at $38.45 each. The $1,298 of extra batteries adds 155 claimed miles at $8.37 each.
  • We do not stock those two packs. Eunorau sells the 52V 21Ah and 52V 17Ah packs on its own store; the only Eunorau battery on our shelf is a 48V 15Ah pack for a different platform. Checked September 19, 2026, and said here so it does not surface at checkout.
  • The AI answers about Eunorau's warranty are reading a page Eunorau replaced. Ask an engine and you are told 5-year frame, 2-year prorated battery. The policy Eunorau publishes today reads 10-year frame and 24 months on battery, motor and electricals — better than the machines are telling you.
  • 1,000 watts is the number to check against your state, and 20 mph is not the whole answer. Eunorau's own spec line reads "Class 3 · Speed limited · Unlockable".

What's on this page

Twenty-three sections. The ride and the videos come first, the range arithmetic and the price of the 220-mile configuration next, then the law, the fit test, the ledger and the buying terms.

Who the FLASH 2.0 is for

Eunorau FLASH 2.0 review cover: the bike on a grass hillside at dawn with the headline three battery bays, 220 N·m

Three battery bays are the whole argument for this bike. The pack that ships with it sits in the rack unit under the saddle; the two you buy later go on the top tube and in the down tube.

Buy it if your problem is distance and you would rather solve it by carrying more energy than by riding more carefully — which is what three battery bays are for.

The marketing implies a wider buyer than this, and the narrow one is real. Most long-range e-bikes ask you to accept a single large battery and a single large weight penalty. The FLASH platform lets you start at 832 watt-hours and add up to 1,976 more later, in two separate packs, on the same frame. You are buying the bays as much as the bike.

See our full long-range electric bike guide for how this platform's numbers stack up against seven other verified long-range picks.

Buy something else if you want to ride faster than 20 mph without changing a setting, or if a 1,000-watt motor rules the bike out where you live — both covered below. Our electric bike buying guide is the better starting point if you are still choosing a category.

52V 1000 W mid-drive · 220 N·m · full suspension · 440 lb payload · three battery bays. The listing carries Eunorau's full geometry table and both colorways; what those numbers feel like from the saddle is the next section.

See the listing — $2,499

We rode it: a wet fall, in mud and in rain

Every performance number on this page is Eunorau's published figure, recomputed. The riding is ours. We rode the FLASH 2.0 through a wet fall, across a plowed field in the mud and in the rain, and when the test was over the bike was sold to a food-delivery courier who has been hard on it since. Both videos are in this section, with the courier's record between them.

The mud. Our own footage from the ride, six minutes, published September 17, 2026 on our channel; the player opens partway in, and the full cut is at the link.

What the torque does from a standstill

220 N·m is a number until you open the throttle. From a stop, on the throttle alone, the front wheel comes up. The lift is what Eunorau's torque figure looks like from a standstill, and it is the reason to learn the throttle seated and on flat ground before you learn it on a hill, with the torque-sensor assist doing the work until you have.

On our rides, loaded and ridden hard, the motor did not overheat once, and it was quiet. Eunorau publishes the sensor behind the assist as a "high-sensitivity torque sensor and speed sensor", and on the road that reads as assist arriving in proportion to how hard you press, with no surge. A new rider wants that behavior.

The same page publishes "shift detection that was combined with the motor", and you feel it: on each gear change the power pauses for a beat so the chain moves under no load, and to a rider who likes manual cars it feels like a gear change in one.

What it will not do is spare you the shifting. In stop-and-go traffic a mid-drive asks for a gear change at every light, and if that is your riding, the rear-hub FLASH LITE 2.0 on the same frame is the better tool. Ride this one like a manual car, in the right gear for the speed and the slope, and the gearing does what our motor guide says a mid-drive is for.

The frame, the welds, and what photographs hide

In person the bike looks more expensive than its photographs suggest, and the welds are the reason. The weld job around the frame is, in the rider's word, phenomenal, the frame is heavy-duty in the hand, and the Moon Black of the bike in the footage is a deep blue. Off pavement you listen for anything loose, because on a full-suspension frame anything loose announces itself over the first rut. Nothing did.

It felt as solid as the Himiway D7 Pro we have also ridden, which is the bike we hold that feeling against. The suspension is the other thing you feel: Eunorau publishes a KZ-209 coil shock, 290 mm and rated 1,000 lb, under an 80 mm EXSHO fork, and on the field both could be felt doing their work.

Rain, mud, and the tire it ships with

In the rain it was stable; in the mud it was slippery. The stock CST 20 × 4.0 is a moped-style tread that says so on its sidewall, and on the plowed field it slid in the wet soil.

If mud is your regular surface, budget a knobbier tire for it before the first fall, and our fat-tire guide explains what a tread choice changes; if your surface is road, path and gravel, leave the tire alone. Fenders are a $59 optional kit that Eunorau sells and we do not stock; if a wet fall is your riding, tell us and we will say where to get the kit before the bike arrives.

The rain. A walkthrough of the features on a wet fall day, from a motor that does not turn the wheel; published September 17, 2026 on our channel.

Two riders, hours in the saddle, and the throttle

The saddle fits two people, and the motor has the torque to pull two up a very steep hill. The judgment is the rider's, from the saddle, and it agrees with Eunorau, which sells the bike for two, writing that "the extra weight of a passenger is no problem", and publishes a 440 lb total payload; the three things to check before you carry anyone, your state's passenger rule among them, are under fit.

The rack carries cargo and nothing else: Eunorau's own rear rack for the FLASH is $59, carries 55 lb, and its listing says cargo only, with no passenger and no child seat.

Hours in that saddle in cold, wet weather left no soreness, and that verdict comes from a rider who lives with chronic pain and knows that cold and damp are when it flares. Photographs make every long bench seat look like every other; they are no more alike than two chairs are.

The one control we would change is the throttle. Eunorau fits a thumb throttle, and on our long throttle-only stretches the thumb tired; we would choose a twist throttle. The answer on the bike as it ships is the torque-sensor assist, which does the same work for a rider who keeps pedaling.

What happened after the test

As of September 19, 2026, one breakdown, on a bike ridden hard for food delivery. The test bike was sold to a courier, and the one failure so far was the front hydraulic brake line. Eunorau covered the part and shipped it promptly, and a Eunorau technician was reachable right away, without anyone being put through the wringer. Buy from us and any claim on your bike is ours to run.

What the ride settles

The ride settles what a specification cannot: that the frame and welds are the real thing, that the torque sensor and the shift detection Eunorau publishes are there and do their jobs, that the saddle fits two people, and that one brake line has failed on a bike ridden hard for delivery. Every range, speed and gradient figure on this page is Eunorau's published claim or arithmetic from it, and Limitations 2 records what the ride did not log.

Asked to put it in car terms, the rider's answer is a crew-cab pickup: a second seat, a bed, the torque to move both, and, with the extra packs, the tank to go a long way. The verdict from the saddle is that, as a package, it is the best, because it is modular enough to adapt to your life, and the sections below are where that package gets priced and where the law gets its say.

Takeaway

  • The ride confirms the drivetrain's two published features. The torque-sensor assist arrives in proportion to your effort, and the shift detection pauses the motor for each gear change; both are Eunorau's, and both do their job.
  • The saddle fits two people, and the published 440 lb total payload is the number that supports it. The rack is cargo only at 55 lb, and your state's passenger rule applies before anyone climbs on.
  • Stable in rain, slippery in mud on the stock tire. A knobbier tire is the answer if mud is your ground, and the fender kit is Eunorau's $59 option that we will help you source.

The bike in the videos is Moon Black, which is a deep blue, and this button buys it; Lunar Dust is here. It ships free across the contiguous US, and the warranty is ours to run.

Buy this colorway — $2,499

How we verified this Eunorau FLASH 2.0 review

Written by Milad Ghobadibeygvand, BScN (Western University, 2014), who rode this bike.

Verification basis: ridden; every specification below was confirmed at the manufacturer and recomputed by us. Every figure is linked to Eunorau's product page and specification table, saved to disk on August 31, 2026 and re-read on September 19, 2026. Prices, availability and payment terms were read from our own listing on September 19, 2026.

The warranty terms come from Eunorau's current and superseded policy pages, dated against the Internet Archive. What the ride showed is reported as ours, in its own section; every range, speed and gradient figure is Eunorau's, recomputed. The Wh-per-mile arithmetic is reproducible from the script and dataset named in the range section, and the demand this page answers is set out in the source register.

Questions or a correction: support@redtailebikes.com. We publish corrections on the page itself.

Eunorau FLASH 2.0 specifications

Every row is Eunorau's published figure, retrieved August 31, 2026.

Specification Published figure
Motor 52V 1000 W Truckrun mid-drive, 220 N·m
Maximum speed 20 MPH
Class (Eunorau's wording) "Class 3 · Speed limited · Unlockable"
Battery, as shipped 52V 16Ah (832 Wh), in the rack unit under the saddle
Second pack (top tube, optional) 52V 21Ah (1,092 Wh)
Third pack (down tube, optional) 52V 17Ah (884 Wh)
Range, one pack 65 miles
Range, two packs 135 miles
Range, three packs 220 miles
Frame Aluminum alloy 6061, 20-inch
Suspension Full suspension
Fork EXSHO STRONG-DH, 80 mm travel
Rear shock KZ-209, 290 mm, 1,000 lb
Brakes Hydraulic disc, 180 mm front and rear
Brake levers Motor cutoff switch
Drivetrain Shimano 8-speed thumb shifter, 44T chainwheel, 170 mm cranks
Tires CST 20 × 4.0
Rims 20-inch black alloy, stainless spokes
Display BC281 LCD
Throttle Thumb throttle
Pedal assist 0–5 levels
Charger US standard 4.0 A smart charger
Weight 82–92 lb
Total payload 440 lb
Recommended rider height 5'2" – 6'4"
Standover height 30.7 in (780 mm)
Seat height 33.1 in (840 mm)
Wheelbase 43 in (1,090 mm)
Total length 68.5 in (1,740 mm)
Colorways Moon Black, Lunar Dust
Price $2,499

Two rows deserve a note before you read on. The weight is published as a range, 82 to 92 lb, and Eunorau does not say what moves it — the safe reading is that a bike carrying more packs weighs more. And the 440 lb payload is a total, meaning rider plus cargo plus anything bolted on.

The 220-mile claim, and the number underneath it

Do the division before you decide whether to believe it. Three packs hold 2,808 watt-hours. Eunorau promises 220 miles. 2,808 ÷ 220 = 12.76 watt-hours per mile. The whole claim reduces to that figure, expressed as what it assumes about your riding.

Now do it for the bike as it ships. One 52V 16Ah pack holds 832 Wh, and Eunorau promises 65 miles. 832 ÷ 65 = 12.80 Wh/mi.

Those two figures are 0.3% apart.

The FLASH 2.0's three battery bays, one in the down tube and two mounted to the frame

Left to right: the bike as it ships, then each optional pack, then both. Eunorau labels them itself — 52V21Ah on the top tube, 52V17Ah in the down tube — which is where the 2,808 Wh total comes from.

This is worth sitting with, because it is the opposite of the pattern you expect. A manufacturer stretching its flagship figure makes the big number look better than the small one — the triple-battery configuration would post a lower Wh/mi, as if adding packs made the bike more efficient. Eunorau's numbers do not do that. Whoever built this range table picked one consumption rate and applied it three times.

Configuration Watt-hours Claimed miles Implied Wh/mi
One pack, as shipped 832 65 12.80
Two packs 1,924 135 14.25
Three packs 2,808 220 12.76

So the honest question is not whether the 220 is inflated relative to the 65. It is whether 12.8 Wh/mi is a number you will ever see.

The shelf says 12.8 is normal, which is the problem

To answer that we measured every range claim we sell. wh_per_mile_census.py reads every active e-bike on redtailebikes.com, pulls the published base pack and the published range, and divides.

We are the only publisher of this dataset, so it cannot be corroborated against anyone else's. What it can be is reproduced: the script and the row-by-row data ship with this article, and re-running it against the same catalog returns the same figures.

All 208 listings carrying our e-bike tag are accounted for, read on September 19, 2026. The denominator comes before the count, and every exclusion is named rather than quietly dropped.

What the 208 tagged listings publish Listings What we do with them
A base pack and a range that belongs to it 97 The measurable set. Every figure below is computed from these and nothing else
A headline range belonging to a battery sold separately 35 Excluded. Dividing a base pack into a dual-battery range describes nothing
Neither figure 75 Nothing to compute, and nothing estimated
No operable pedals — one balance bike 1 Outside the federal e-bike test's own limb, so outside the 207

Across those 97 bikes, the median implied consumption is 12.48 Wh/mi. The mean is 15.04. A quarter of them sit below 10.46, a quarter above 19.14.

The FLASH 2.0's 12.80 lands at the 53rd percentile. Fifty-one of the 97 bikes we sell assume less energy per mile than this one does.

That reframes the skepticism entirely. There is nothing unusual about this bike's range claim; what is unusual is that anyone treats any of these figures as a distance.

A rate near 12.8 Wh/mi describes low assistance, moderate speed, flat ground, a light rider and no wind. Those are the conditions every maker in the category quotes and almost nobody rides in. On a 20-inch fat tire with a 1,000-watt motor and 82 to 92 pounds of bike, ridden the way people ride moto-style e-bikes, the real number sits well above it.

The AI engines repeat these claims without doing the division. Asked which e-bike has the longest range in 2026, the answer set names the Fiido Titan at 248 miles and the Aniioki A8 Pro Max at 3,640 Wh and 220 miles. It does add a caution: a triple-battery figure is "the best-case number, not what you'll see riding it normally".

What it never does is show the arithmetic that turns that caution into a planning number.

The Aniioki's 220 miles on 3,640 Wh implies 16.55 Wh/mi — the same claimed distance as the FLASH 2.0, on 30% more stored energy. Both are published claims, and setting them side by side is the only way to see what each maker is assuming.

How to use the number instead of arguing with it. Take the pack you will actually own, in watt-hours, and divide by a consumption rate you choose. At 12.8 Wh/mi you get Eunorau's figure.

Twenty Wh/mi is a fair rate for a heavy fat-tire bike ridden with real assist, and 25 is fair for throttle-heavy riding on hills. Those are the ranges to plan around, and the arithmetic is yours to redo with your own rate once you have ridden it.

Consumption you plan at One pack, 832 Wh Three packs, 2,808 Wh
12.8 Wh/mi — Eunorau's own assumption 65 miles 220 miles
20 Wh/mi — real assist, heavy bike about 42 miles about 140 miles
25 Wh/mi — throttle-heavy, hills about 33 miles about 112 miles

Takeaway

  • Divide before you believe. Watt-hours ÷ claimed miles = the consumption the claim assumes. For this bike that is 12.80 Wh/mi on one pack and 12.76 on three.
  • The shelf median is 12.48 Wh/mi across the 97 bikes we sell that publish a pack and a matching range. This claim is ordinary, and so is the caution it deserves.
  • Substitute your own rate. At 20 Wh/mi the same batteries give about 42 miles on one pack and 140 on three; at 25 Wh/mi, 33 and 112.

What 220 miles costs, and what we can ship you

Start with the sticker: $2,499, and the bike arrives with one 832 Wh pack.

Eunorau sells the other two on its own store. The 52V 21Ah top-tube pack is $699 and the 52V 17Ah down-tube pack is $599, both read on Eunorau's store on September 19, 2026. Fully loaded, the machine that goes 220 claimed miles costs $3,797.

What you buy Price Claimed miles Cost per claimed mile
Bike as shipped $2,499 65 $38.45
+ second pack $3,198 135 $23.69
+ third pack $3,797 220 $17.26

The marginal maths is the interesting part. That $1,298 of batteries adds 155 claimed miles, which works out at $8.37 per mile against the $38.45 you pay for the miles in the box. On this platform the batteries are the cheapest thing you can buy.

Eunorau FLASH 2.0 colorways side by side: Moon Black, a deep blue, and the pale gray-green Lunar Dust

Moon Black on the left, Lunar Dust on the right — the pairing comes from Eunorau's own variant-to-image mapping, not our guess. Worth knowing before you order: Moon Black is a deep blue. Both carry identical hardware at $2,499, and both were orderable on September 19, 2026; the bike in the videos above is Moon Black.

And here is what we cannot do for you. We stock the FLASH 2.0 in Moon Black and Lunar Dust, both orderable when we read our own storefront on September 19, 2026. We do not stock the 52V 21Ah or 52V 17Ah FLASH packs. The only Eunorau battery on our shelf that day was a 48V 15Ah secondary at $499, which is a different voltage for a different bike and will not fit this one.

We would rather say that here than have you find it at checkout. If the upgrade path is the reason you want this bike, email support@redtailebikes.com before you order and we will tell you where the packs are available and what they cost that week, and how to line them up with the bike. We would rather answer that before your order than after it.

832 Wh in the box, two empty bays for later. On the sample plan our listing renders for Shop Pay that is $225.56 a month for 12 months at 15% APR, subject to an eligibility check, and we handle any warranty claim ourselves.

Order the FLASH 2.0 — $2,499

Three drive systems, one name

The FLASH is a platform. The name alone will not tell you which bike you are looking at. Eunorau builds the same frame with a mid-drive, with all-wheel drive, and with a rear hub drive. Only the version reviewed here has the 1,000-watt Truckrun mid-drive.

This confuses people in public. On r/ebikes one commenter states flatly that "the flash is not a mid drive, most of the moped style are not mid drives", and another has to answer a recommendation thread with "Eunorau flash. The model with the mid drive motor." Both are half right, which is exactly the problem: the platform contains a machine that matches each description.

The range as it sits on our shelf today:

Model Drive Motor Price
FLASH 2.0 Mid-drive 52V 1000 W Truckrun, 220 N·m $2,499
FLASH AWD 1.0 (reviewed) All-wheel drive Dual 52V 750 W hub, 92 N·m each $2,099
FLASH LITE 2.0 (reviewed) Rear hub 52V 750 W, 92 N·m $1,899
FLASH LITE ST (reviewed) Rear hub, step-thru 52V 750 W, 92 N·m $1,899

All four share the 52V 16Ah base pack and the same published range table, and all four are limited to 20 mph.

Studio profile of the Eunorau FLASH 2.0 showing the frame, rack battery unit and mid-drive

The shared frame is why the trims are confused for one another. What separates this one is the black housing at the crank, visible just above the chainring. What the $600 between the LITE 2.0 and the 2.0 buys is the drive system, and our motor guide sets out what that choice changes.

One consequence is worth flagging before you shop elsewhere: retailer listings for this platform carry three different wattages. One store titles it "750-1500W Flash"; another "1000W Mid Drive 52V 16Ah 20 MPH", against Eunorau's own 1000 W figure. If you compare prices across sites, check which drive system each listing is describing before you conclude one of them is cheaper.

What 220 N·m buys on a 20 mph bike

Torque is what gets a heavy bike moving; watts and miles per hour are what keep it moving. On a machine capped at 20 mph, the 220 N·m figure is doing work at every start, every hill and every loaded launch — which is where a 90-pound bike with a rider on it feels heaviest.

The mechanical reason a mid-drive posts numbers like this is that it drives the chain instead of the wheel. Its output passes through the same 8-speed gearing your legs do, so dropping a gear multiplies the motor's torque exactly as it multiplies yours. A hub motor sits in the wheel and is stuck in one effective ratio for ever; it compensates with raw current, which is harder on the battery on a long climb.

What the gearing feels like from the saddle, the shift pause included, is in the ride.

The Truckrun mid-drive unit at the FLASH 2.0's bottom bracket

The motor sits at the crank, low and centered, which is also why this frame carries its weight better than a bike with two pounds of hub hanging off the rear axle.

The costs are real and worth knowing before you buy. A mid-drive wears chains and sprockets faster, because the motor's torque runs through them. It is more expensive to replace. And it will not push the bike without pedaling unless the throttle is engaged — this one has a thumb throttle, so it will, but the throttle is the exception on a mid-drive rather than the norm.

A question observed repeatedly on r/ebikes is "best 1000 watt mid drive fat tire ebike under 3k?" This is one of the few machines that answers it literally: 1,000 watts, mid-drive, 20 × 4.0 fat tires, $2,499.

The FLASH 2.0's 8-speed cassette and rear derailleur beside the coil shock

Eight speeds and a 44-tooth chainring. The motor's torque runs through this cassette, which is why a mid-drive eats drivetrains faster than a hub bike does. Whether it should answer it depends on the section immediately below.

1,000 watts, 20 mph, and the "unlockable" line

Check the wattage against your state before you check anything else on this page. Eunorau publishes this motor at 1,000 watts.

The federal definition of a low-speed electric bicycle at 15 U.S.C. § 2085(b) covers "a two- or three-wheeled vehicle with fully operable pedals and an electric motor of less than 750 watts (1 h.p.), whose maximum speed on a paved level surface, when powered solely by such a motor while ridden by an operator who weighs 170 pounds, is less than 20 mph."

Twenty miles per hour does not rescue a 1,000-watt motor. The speed half of that definition is worth reading twice as well: the statute says less than 20 mph under motor power alone, and Eunorau publishes a maximum speed of exactly 20.

The National Park Service writes its own definition at 36 CFR § 1.4 with a different boundary word — "not more than 750 watts". That changes the answer for a motor of exactly 750, and it changes nothing here. A 1,000-watt motor sits outside both.

Eunorau's own class row reads, verbatim: "Class 3 · Speed limited · Unlockable".

Read that carefully, because it contains three separate claims. "Class 3" is a category that tops out at 28 mph in the states that use it; "speed limited" is why the bike ships at 20; "unlockable" says the limit can be removed.

The FLASH 2.0 cockpit, showing the handlebar, control cabling and round headlight

The display is mounted here, and the unlockable limit Eunorau publishes is the reason the wattage question below is worth reading before you order.

Whether the machine stays inside your state's definition after that is a question the spec sheet leaves with you, and it is the reason this section exists.

What the AI answers get wrong about this

Ask an AI engine whether a 1,000-watt e-bike is street legal in the United States and the answer arrives confident and partly wrong. In our panel it stated that a 1,000-watt machine "completely bypasses standard e-bike laws", that you "will need a license, registration, and insurance", and that "only a few states, such as Georgia and Oregon, allow high-powered eBikes (1000W or more)".

What the engine answered What the code actually says What it means for this bike
"Only a few states, such as Georgia and Oregon, allow high-powered eBikes (1000W or more)" Georgia's § 40-1-1(15.3) requires a motor "of not more than 750 watts" The FLASH 2.0 fails Georgia's definitional test on wattage
The same answer, for Oregon Oregon's bicycle definition sets no wattage figure at all; the 1,000 W cap belongs to the separate motor assisted scooter category The FLASH 2.0 clears Oregon's bicycle definition, for a reason the engine did not give
"You will need a license, registration, and insurance" Nothing federal says so; what follows a 1,000 W motor is set state by state, and varies from a vehicle class to no provision at all Read your own state's line before you order

We publish law pages on both of those states, built from Georgia's statute and Oregon's, and both halves of that sentence fail.

Georgia does not allow 1,000 watts. Georgia's definition at § 40-1-1(15.3) requires a motor "having a power output of not more than 750 watts". The 1,000-watt figure that circulates for Georgia comes from HB 454, a definition repealed seven years ago. An engine quoting it is quoting law that no longer exists. The detail is in our Georgia e-bike laws page.

Oregon does not have a 1,000-watt allowance either — it has no wattage limit at all. Not 750, not 1,000, none. The 1,000-watt cap everybody attaches to Oregon belongs to a different vehicle: the "motor assisted scooter", which is its own category with its own 24 mph ceiling. The number is real and it cannot be borrowed for a bicycle. Our Oregon e-bike laws page walks the code.

So the engine named one state whose rule excludes this bike and one state whose permissiveness comes from somewhere else entirely. Both matter to a buyer, because the outcome for the FLASH 2.0 differs in each: it fails Georgia's definitional test on wattage, and it clears Oregon's bicycle definition because that definition sets no wattage bar.

The instruction is simple. Look your own state up in our state-by-state e-bike law table before you order, and read the wattage line ahead of the class line. A great many state definitions are written around 750 watts, and a 1,000-watt motor meets that definition in none of them.

What follows from that varies enormously, and a state's answer is usually one of three:

  • Into another vehicle category, with that category's own rules on registration, a license, insurance and where you may ride.
  • Down to local authorities, so the answer is your city's or your land manager's rather than your state's.
  • Unaddressed, which is not permission — it means nobody has written the rule you would rely on.

Where you ride matters as much as where you live. Trails, parks and bike paths are frequently governed by the land manager rather than the state code, and a machine over 750 watts is commonly excluded from surfaces a class 2 bike may use.

One more thing about the unlockable limit. Removing a speed limiter changes what the bike is in the eyes of a definition written around speed as well as power. If you are buying this bike partly for that setting, get the answer for your state first.

We will look it up with you: email support@redtailebikes.com with your state and the way you plan to ride, and we will read our own law page back to you and tell you if the answer is a different bike.

Lunar Dust on this button; Moon Black is here. The checkout ships it free in the lower 48, and the law section above is the one to have settled before you press either.

State checked? Buy — $2,499

Takeaway

  • Read the wattage line in your state's rules before the class line. Federal law defines a low-speed electric bicycle at "less than 750 watts"; this motor is 1,000.
  • Two states the AI answers name are both wrong on the reasoning. Georgia's 1,000-watt figure was repealed seven years ago, and Oregon's belongs to a different vehicle category entirely.
  • Where you ride matters as much as where you live. Trails, parks and paths are usually the land manager's decision, and over-750-watt machines are commonly excluded.

The warranty the AI engines are getting wrong

Eunorau's current warranty covers the frame for ten years, and the battery, motor and electrical components for 24 months. Those are the terms on our listing, and they match Eunorau's published policy word for word.

The reason this needs a section is that if you ask an AI engine, you get different numbers.

In our panel, the engine reported "the frame carrying a 5-year replacement warranty from the production date" and warned that "the battery carries a 2-year prorated warranty, meaning warranty coverage decreases over time rather than providing full replacement protection". It added the sting: "'2-year battery warranty' does not mean a free replacement battery in month 20."

The engine is describing a real Eunorau document. It is describing the wrong one.

Eunorau has two warranty pages live on its own site — the current one and an older one. We fetched both on August 31, 2026, and both were still live on September 19, 2026:

Term /pages/warranty /pages/eunorau-warranty
Frame "10-Year replacement/repair Warranty" "replacement warranty for 5 years"
Battery "24-Month" "2-year prorated warranty"
Motor "24-Month" "12 months"
Display, controller, fork, shock "24-Month" "12 months"

The Internet Archive dates them. /pages/warranty has been captured eleven times between September 30, 2023 and August 30, 2026 — the day before we checked. /pages/eunorau-warranty has fifteen captures running from April 2021 to September 2025, and none since.

Eunorau announced the change itself: "The warranty on our e-bikes has been extended from 1 year to 2 years", effective for purchases after August 1, 2023. The older page was simply never taken down, and the engines are still reading it.

So the correction runs in your favor. The prorated battery credit that the AI answer warns you about — 20% within six months, 10% within twelve, 6% after that — belongs to the superseded policy. What Eunorau publishes today is a flat 24 months on the battery. Verify it yourself at the current warranty page before you order; a policy is only ever true on the day you read it, and this one has changed once already.

Two limits are on the current policy and are worth knowing. It excludes "Labor charges for part replacement or changeover", and the frame cover is "a replacement/repair frame only" with changeover labor explicitly not included. Ordinary wear items — brake pads, rotors, tires, chains, cassettes — are outside it, which is normal for the category.

The FLASH 2.0's front hydraulic disc brake and 180 mm rotor

Rotors and pads are on the wear-item list every warranty excludes, this one included. On a bike of this mass they are also the parts you will replace first.

Buy the bike from us and we run the claim. You send us the problem; we deal with Eunorau. The practical difference between a dealer purchase and a direct one sits in that sentence, which is why the paragraph above is worth reading twice.

Takeaway

  • The policy that governs is the one Eunorau publishes today: ten years on the frame, 24 flat months on the battery, motor and electrical components, with no proration.
  • The prorated battery credit the engines warn you about belongs to a page Eunorau replaced, and that page is still live on its own site, which is why the warning keeps circulating.
  • Wear items are outside it either way — pads, rotors, tires, chains and cassettes — and labor for a part changeover is excluded even when the part is covered.

Weight, standover, and the passenger question

At a published 82 to 92 lb, this bike lives on the ground floor. Plan storage before you plan routes. It will not go up a flight of stairs without help, and getting it onto a car rack is a two-person job or a ramp.

The geometry is friendlier than the weight suggests. Eunorau publishes a 30.7 in standover and a 33.1 in seat height, on a 43 in wheelbase and a 68.5 in overall length (780, 840, 1,090 and 1,740 mm in the maker's own table). The recommended rider range is 5'2" to 6'4", which is unusually wide, and the 20-inch wheels are why: small wheels drop the whole frame.

The FLASH 2.0's frame, showing the low standover and the long saddle

Thirty and a half inches of standover on a bike with 20-inch wheels. The long flat saddle in this frame is the reason the next question comes up as often as it does.

The payload is 440 lb total — rider, cargo, accessories, everything you put on the bike. Generous by category standards, and the number that makes the following question worth answering properly.

Can it carry two people?

Eunorau markets it that way. Its own product page says: "Two riders, one e-bike: with the 52V1000W motor, the extra weight of a passenger is no problem." Eunorau is the only publisher of that sentence, which is what makes it a marketing claim and not a finding.

The question is asked constantly. It appears as a heading on the one retailer review of this bike, and on r/ebikes a rider describing their search wrote that they "wanted an ebike that's fast, has long range battery life and can seat two people".

Three things are true at once, and you need all three.

The bike's numbers support it, and so does the saddle. A 440 lb payload comfortably holds two adults and cargo; from the saddle the seat fits two people with room, and the motor has the torque to pull two up a steep hill. Eunorau sells a foot-plate pedal set for the platform as a $29 accessory, and its rear rack is rated for 55 lb of cargo and, in Eunorau's own words, is not for passengers.

Eunorau does not publish a passenger rating. There is no seat-length figure in the specification, no passenger weight limit, and no statement that the foot plates are rated for a rider. A payload total is not the same document as a passenger provision, and this page will not treat one as the other.

Carrying a passenger is separately regulated where you live, and the rules are not about the bike. Many states address passengers on a bicycle directly — some require a designed passenger seat, some set an age floor, some prohibit it outright on certain machines. Check your own state in our law table before you plan around it.

The Mercer fit test

The Mercers are our editorial cast — seven fixed American archetypes we hold every bike against, so that "does it fit me?" gets the same measuring stick every time. You can meet the family here. They are archetypes and not testers; every verdict below is read off a published number or a rule, and where Eunorau publishes nothing, the row says so. What the ride settled is reported under its own heading and kept out of the rows.

The numbers in play, all of them Eunorau's: 5'2"–6'4" rider range, 30.7 in standover, 33.1 in seat height, 82–92 lb, 440 lb payload, 1,000 W, 20 mph as shipped.

A rider standing beside a parked Eunorau FLASH 2.0 inside a covered industrial space

Eunorau's own photography for this platform is shared across its trims, so treat the colorway in any given frame as illustrative. The proportions are the FLASH frame in every one of them.

Member Verdict The number behind it
Frank Kowalski, 63, 5'10" Yes, with a caveat about the garage. The 30.7 in standover is manageable and the mid-drive means he never fights the bike from a stop. Inside the published 5'2"–6'4" range; 82–92 lb is the caveat; the geometry is fine.
Ruth Kowalski, 61, 5'5" Yes on fit, no if she rides alone off pavement. She clears the standover with room. The weight is the whole question — a bike this heavy is hard to pick up unaided. Standover 30.7 in against her 5'5"; the 82–92 lb figure is the one to weigh.
Jack Mercer, 48, 6'1" The intended buyer. Fat tires, full suspension, 220 N·m and three battery bays is a build aimed squarely at his kind of riding. 6'1" sits well inside 5'2"–6'4"; 440 lb payload absorbs him and a load.
Dana Mercer, 45, 5'7" Yes for hauling, no for the school run. The payload is real; the 1,000-watt motor is what rules it out of a lot of shared-path riding. 440 lb payload; 1,000 W against the 750 W most state definitions are written around.
Maya Torres, 32, 5'6" Not for city commuting. She clears the frame easily, and a machine this heavy and this powerful is the wrong tool for lanes, racks and lifts. Fits the range; 20-inch wheels and 82–92 lb are the argument against.
Cole Mercer, 16 No, and it is the motor that rules it out. At 5'11" he fits the frame outright. A 1,000-watt machine is outside the bicycle definition in most states, which routes it into vehicle categories with their own licensing rules. 1,000 W; the state table has the per-state answer for a 16-year-old.
Ivy Mercer, 12 Off the table at her age, on every reading. No state that addresses the question puts a 12-year-old on a machine like this, and the 82–92 lb weight would be against her before the law was. Age rules first; 82–92 lb and 1,000 W second.

The contrast worth naming is Jack and Maya, and it is the same bike. For Jack the weight is ballast and the motor is the point. For Maya, riding the same city Jack drives through, that weight is a bike she cannot get up a step and a motor that keeps her off the paths she would use. Nothing about the machine changed between those two rows. Everything about the ride did.

Where Eunorau publishes nothing, we have not filled it in. There is no published passenger rating, no assembly state, and no separate standover for the two colorways. Those gaps are listed in full under limitations.

Has it been recalled?

No CPSC recall names Eunorau or this model, checked August 31, 2026 — and here is what that check did and did not cover.

We ran the Consumer Product Safety Commission's recall service against the brand and it returned nothing.

Before trusting that silence we validated the instrument the same day. The identical query against Aventon returned its real January 2024 folding e-bike recall — around 2,300 units, six reports of unexpected acceleration.

An endpoint that finds a genuine e-bike recall and does not find Eunorau is telling you something. One that returns nothing for everybody is telling you it is broken, which is why the control is run first.

We then checked independently by searching the Commission's own domains. That surfaced ten real e-bike safety actions from 2023 to 2026 — Trek, Trek and Electra, Rad Power, Santa Cruz, FENGQS, Pacific Cycle, Lectric, Gyroor, Ancheer — and no Eunorau entry.

What we could not do, stated because it bounds the claim: the Commission's full-text search returned HTTP 403, its public product search returned 503, and its open-data endpoint would not connect. Its warnings index is paged and we could enumerate only part of it.

A recall and a safety warning are different instruments, and a brand can carry a warning while returning zero recalls. So the honest statement is the one at the top of this section — no recall was found on a working instrument — and not "a clean safety record", which is a claim this check cannot support.

Is it UL certified?

Eunorau's product page states "UL CERTIFIED: Yes" and names no standard there. The standards are named elsewhere on its site, and the gap between the two is worth understanding before you decide what it means.

On March 5, 2023 Eunorau published an announcement titled "We are UL 2849 tested and UL 2271 tested!" It says "all of our ebikes have passed the UL 2849 testing" and that "Our ebike batteries have also passed the UL 2271 tests, which required an evaluation of all of the battery components". UL 2849 covers the electrical system of an e-bike as a whole; UL 2271 covers the battery pack.

So both standards are named, and the announcement is unambiguous about scope.

What Eunorau does not publish, for this model or any other, is a certificate: no file number, no issuing laboratory, no date of issue. Its /pages/ul-certification URL returns a 404, checked the same day. And the announcement predates this model by some years while covering "all of our ebikes" prospectively.

Two readings are available and we decline both. "Passed the testing" is not the same words as a listing that names this model on a certificate face, and treating it as one would be generous. Treating the absence of a published certificate as evidence that no certificate exists would be the mirror error — a document we cannot find is not a document that does not exist.

What to do with that. If UL certification is a requirement where you live — and in a growing number of places it is a condition of sale and no longer a preference — ask for the certificate before you order. Email support@redtailebikes.com and we will request it from Eunorau in writing and send you whatever comes back, including if the answer is that they cannot produce one for this model.

Buying it from us

What you are buying The terms, read on September 19, 2026
Price $2,499, the same figure Eunorau charges on its own store, both read that day
Shipping Free to the contiguous US, per our shipping policy. A bike published at 82–92 lb goes by freight, crated; the carrier calls to schedule the delivery and may ask for a signature
Paying over time Shop Pay Installments: the sample plan our listing renders reads $225.56 a month for 12 months at 15% APR, subject to an eligibility check, with a 3-month plan at $853.91 beside it
Warranty Eunorau's 10-year frame and 24-month component terms, and we run the claim: you send us the problem and we deal with Eunorau, from the first email to the part arriving
If it arrives damaged Note it with the driver, email us photos within 48 hours, and we take it from there with the carrier
Availability Both colorways were orderable on our storefront on September 19, 2026. Moon Black is a deep blue; Lunar Dust is the pale one
The extra batteries We do not stock the 52V 21Ah or 52V 17Ah FLASH packs; the one Eunorau battery we carry is a 48V 15Ah pack for a different bike. Ask us and we will tell you where the FLASH packs are available that week
What arrives assembled Eunorau publishes no assembly state for this model, so ask us in writing before the crate is opened, because the return window closes the moment the bike is built
Service after the sale Every warranty claim on anything bought here is ours to handle; outside warranty, the Shimano 8-speed and the hydraulic brakes are ordinary bike-shop work, and the Truckrun mid-drive and the 52V electronics are the parts to bring to us
Sizing Send us your height and inseam and you get a straight yes or no against the published 5'2"–6'4" range before you pay
Support People who have ridden this exact model, on (213) 444-4020 and at support@redtailebikes.com, for as long as you own it

Change of mind: our refund policy takes a return only while the crate is unopened and factory-sealed and only if you ask within 72 hours of delivery, with a 15% restocking fee and the return shipping; a cancellation before the order ships carries a 3% transaction fee, and once a box is opened or a bike assembled or ridden, the change-of-mind window has closed.

What this page does not claim: a recall all-clear, a UL certificate for this model, or any range, speed or gradient figure from the ride; each is set out in the section where it belongs.

The FLASH 2.0's CST Scout 20 x 4.0 fat tire and front disc

CST Scout 20 × 4.0 rubber, marked "E-MOPED STYLE" on the sidewall. Tire pressure is the cheapest lever you have on the range figures above.

The honest ledger

Green flags

  • Ridden, and it matched its paperwork. The torque-sensor assist and the shift detection are there and do their jobs, the welds and frame are the real thing, and the motor stayed quiet and did not overheat on our hard, loaded rides — the ride.
  • A single warranty event so far, handled without argument. A front brake line on the courier's bike, covered by Eunorau and shipped promptly, with a technician reachable right away.
  • The range table is internally consistent. 12.80 Wh/mi at one pack, 12.76 at three. Whatever you think of the assumption, the same one was applied to every configuration.
  • Three battery bays on one frame, with a documented upgrade path from 832 Wh to 2,808 Wh, and the marginal miles cost $8.37 each against $38.45 for the ones in the box.
  • 220 N·m through an 8-speed drivetrain. A mid-drive at this price on 20 × 4.0 fat tires is a genuinely uncommon combination.
  • A 440 lb payload and a 5'2"–6'4" rider range, both unusually generous, on a 30.7 in standover.
  • The current warranty is better than the internet believes: 10 years on the frame, 24 flat months on battery, motor and electrical components, with no proration.
  • No CPSC recall found on a validated instrument, corroborated independently.
  • Hydraulic discs with 180 mm rotors front and rear, and motor cutoff in the levers — the right specification for a bike of this mass.

Who it is wrong for, and where to go instead

  • The rider who expects 220 miles at the sticker price. The headline range is a $3,797 configuration; settle your configuration in the cost section before you order, because the bike changes with it.
  • The rider who needs the packs in the same cart. We do not stock them; tell us the configuration you want and we will say where the packs are available that week.
  • The rider whose state writes its definition at 750 watts. 1,000 W sits outside the federal definition and outside most state definitions; read your state's line first, or look at the FLASH LITE 2.0, a 750 W hub on the same frame.
  • The rider buying it for the unlock. Email us with your state and the way you plan to ride, and we will read our own law page back to you, because a raised limit changes what the bike is under a definition written around speed as well as power.
  • The rider who has to carry it. 82 to 92 lb lives at ground level; our buying guide starts with the lighter categories.
  • The rider carrying a passenger daily. Read the fit section first: it has the three things to check, states regulate passengers separately, and if you want a rating in writing from Eunorau, ask us and we will request it.
  • The rider in stop-and-go traffic. A mid-drive asks for a gear change at every light; the rear-hub FLASH LITE 2.0 on the same frame is the answer.
  • The rider whose ground is mud. The stock tire was slippery on a wet field; budget a knobbier tire, and our fat-tire guide sets out the choice.
  • The buyer who needs a UL certificate on file. Email us and we will request one from Eunorau in writing and send you whatever comes back; none is published for this model.

Who should buy it

Buy it if distance is your actual problem and you are willing to spend $3,797 to solve it; if you ride where a 1,000-watt machine is permitted and you have checked that yourself; if you have ground-floor storage; and if a 20 mph ceiling is fine because your rides are long rather than fast.

What it costs to own. $2,499 outright, or on the sample plan our listing renders for Shop Pay, $225.56 a month for 12 months at 15% APR, $2,706.72 in total, subject to an eligibility check. The two packs that make it a 220-mile machine add $1,298 on top, and the marginal miles they buy cost $8.37 each against $38.45 for the ones in the box.

Look at the FLASH LITE 2.0 instead if you want the same frame, the same battery bays and the same range table for $600 less, and you do not need a mid-drive, or if your riding is stop-and-go and you would rather not shift at every light. It is a 52V 750 W rear hub — which also lands it inside more state definitions than this bike does.

Look at the Eahora Romeo Pro II instead if you want a moped-style machine with a bigger single battery and no upgrade path to manage. It is the bike the AI engines name in the same breath as this one, and we have reviewed it.

Look somewhere else entirely if you need to lift the bike, ride mostly on shared paths, or want a machine whose class is not a question. Our buying guide starts that conversation properly.

The FLASH 2.0's coil rear shock and rear triangle

A KZ-209 coil shock rated at 1,000 lb, 290 mm long. Full suspension on a moto-style frame is uncommon at this price and it is one of the reasons the bike weighs what it does.

Moon Black on this button, Lunar Dust here; both were orderable on September 19, 2026. Free delivery in the lower 48, US support that has ridden this machine, and a warranty we run for you.

Buy the FLASH 2.0 — $2,499

Before you buy: the checklist

Work down it. Any "no" is worth an email before an order.

  1. Look up your state's wattage rule before its class rule, in our state table. A 1,000-watt motor is the question.
  2. Check the surfaces you actually ride. Trails, parks and paths are usually the land manager's call more often than the state's.
  3. Decide your real configuration. One pack at $2,499, or three at $3,797? The answer changes the bike.
  4. Source the extra packs before you commit, because we cannot supply them today.
  5. Redo the range arithmetic with your own rate. Divide your pack's watt-hours by 20 or 25 rather than 12.8, and see whether the answer still works.
  6. Confirm ground-floor storage. 82–92 lb does not go upstairs.
  7. Ask what arrives assembled, in writing, before the crate is opened.
  8. Request the UL certificate if certification matters where you live.
  9. If you plan to carry a passenger, get the seat and foot-plate ratings in writing and check your state's passenger rule.
  10. Read the current warranty page yourself rather than an AI summary of it.

Limitations of this review

Twelve limits apply to what is written above, and most of them are gaps in the published record rather than gaps in the machine.

  1. We sell this bike. Read the red flags as carefully as the green ones. Nothing on this page is independent of that interest, which is why every figure is sourced to a document you can open.
  2. The ride carried no instruments. Nobody logged an odometer total, a rider weight, a temperature or the dates, so every range, speed and gradient figure on this page is Eunorau's published figure or arithmetic from it, and the arithmetic sections test the internal consistency of those numbers rather than their truth.
  3. The consumption rates are division. Division cannot tell you what a bike does on a hill, and the ride was not instrumented to add a measured rate to them.
  4. The Wh/mi census reads published figures only. It covers the 97 of 207 e-bikes on our shelf that publish a pack and a matching range, recounted on September 19, 2026; 35 publish a range for a different configuration and were excluded; 75 publish neither; one balance bike that carries our e-bike tag has no pedals and is set aside. It measures what makers claim, never what bikes do.
  5. The CPSC position is "no recall found", not "no recall exists". Three retrieval routes failed and the warnings index could only be partly enumerated. A re-run on September 19, 2026 returned nothing for the control brand as well, so the August 31 check stands as the last one that worked. Detail is in the section.
  6. No UL certificate for this model was located. We could not obtain one and we do not infer from that that none exists.
  7. Eunorau publishes no passenger rating, no assembly state, and no seat-length figure. All three are open questions for Eunorau, and until they are answered those rows say "not published".
  8. The AI-search panel was run on one accessible instrument, Claude Code WebSearch on the US surface, and is labeled as such in our records. ChatGPT, Perplexity and Google AI Overviews were not reachable and were not run.
  9. No search-volume figure appears anywhere on this page. Our paid keyword instrument is unavailable and the Google product that reports absolute volume is not accessible with our credentials. Demand here is described by what was observed, never by a number we could not measure.
  10. Every figure expires. Prices, stock, policies and law change. This page was verified on September 19, 2026, and each volatile claim carries its own date in the sentence.
  11. The courier's record is one bike and one rider. One breakdown as of September 19, 2026 is our own service record for a single machine, reported as a single case and never as a failure rate.
  12. No unit count is printed. Our listing does not track inventory, which means the storefront answers "available" without counting; the page therefore says both colorways were orderable on the date read and stops there.

Expiry conditions — when this review goes stale. This page has no sunset date. It expires on events, and any one of these is the trigger to re-verify it:

  • Eunorau changes the motor, battery, geometry or payload rows on the FLASH 2.0 page.
  • Either optional pack moves off $699 or $599, or Eunorau stocks them through us.
  • Our price moves off $2,499, or the Shop Pay plan our listing renders changes.
  • A CPSC recall or safety warning naming Eunorau is published.
  • Eunorau publishes a UL certificate, a passenger rating or an assembly state for this model.
  • The superseded warranty page comes down, or the current terms change.
  • The courier's bike needs a second repair, or the machine changes hands again.

The source register

Tier What it means Used here for
T1 Statute, regulation or federal agency record The federal e-bike definition; the National Park Service definition; the Georgia and Oregon codes; the CPSC recall record
T2 The manufacturer's own published documents Every specification, the range table, both warranty policies, the UL announcement, the accessory prices
T2 Our own live store data, read through the Shopify Admin API Price, colorways, availability, the 207-bike census
T2 Our own footage and the rider's account The two videos embedded in the ride section, on our channel, and the observations attributed to the rider there
T3 An AI-search panel, run on one accessible instrument and labeled What the engines currently answer about this bike, its warranty and 1,000-watt legality
T3 Observed public discussion The drive-system confusion and the two-rider question, both quoted and linked
T4 Retailer listings Named only as evidence that wattages differ between storefronts. Never relied on for a fact
T5 Aggregators, AI summaries, content farms Not cited anywhere on this page

How the demand was measured. The questions this page answers were harvested instead of assumed: 1,078 rows across seven sources on August 31, 2026 — 640 Google autocomplete completions, 177 Reddit posts and comments, 124 headings from the pages ranking for the query, 80 related searches, 44 Google Search Console queries from our own property, eight rows from an AI-search panel and five from Google Trends — then 64 further autocomplete completions on September 19, 2026.

The ledger holds 50 demand items: 47 answered on this page and 3 dropped, each with the reason recorded; 4 of the answered items were added by the editor and are labeled as ours in the ledger.

Frequently asked questions

How far does the Eunorau FLASH 2.0 actually go on one charge?

As it ships, with one 52V 16Ah pack, Eunorau claims 65 miles. That works out at 12.80 watt-hours per mile, which describes low assist, flat ground and a light rider. At a realistic 20 Wh/mi for a fat-tire bike of this weight, the same 832 Wh pack gives roughly 42 miles.

What is the top speed of the Eunorau FLASH 2.0?

Eunorau publishes 20 mph. Its class row reads "Class 3 · Speed limited · Unlockable", meaning the bike ships limited and the limit can be raised. What the machine becomes under your state's definition after that is a separate question, covered above.

Is the Eunorau FLASH 2.0 a mid-drive?

Yes. The 2.0 uses a 52V 1000 W Truckrun mid-drive rated at 220 N·m, mounted at the crank. The confusion is real and understandable: other bikes in the FLASH range use hub motors, and the platform name is shared across all of them.

How much does the Eunorau FLASH 2.0 weigh?

Eunorau publishes 82 to 92 lb and does not say what moves the figure within that band; the reasonable reading is that additional battery packs account for it. Either end of the range is a bike you store at ground level.

How much does the Eunorau FLASH 2.0 cost?

$2,499 with one battery, on our store and on Eunorau's, both checked September 19, 2026. The configuration that reaches the advertised 220-mile range costs $3,797 once the 52V 21Ah ($699) and 52V 17Ah ($599) packs are added.

What batteries does the FLASH 2.0 take, and what do they cost?

A 52V 16Ah pack ships with the bike. Two more bays take a 52V 21Ah top-tube pack at $699 and a 52V 17Ah down-tube pack at $599, both from Eunorau. Together that is 2,808 watt-hours. We do not currently stock either optional pack.

Can the Eunorau FLASH 2.0 carry two riders?

Eunorau markets it for two, writing that "the extra weight of a passenger is no problem", the 440 lb payload supports the arithmetic, and from the saddle the seat fits two people, with the torque to pull two up a steep hill. What Eunorau does not publish is a passenger rating, a seat-length figure or a foot-plate load rating, and its rear rack is rated for cargo only. Carrying a passenger is also separately regulated in many states.

There is no single national answer, and any source giving you one is oversimplifying. Federally, 15 U.S.C. § 2085(b) defines a low-speed electric bicycle as having a motor of "less than 750 watts", so a 1,000-watt machine falls outside it. What that means on your road depends on your state, and our state table has each one.

Does peak wattage or continuous wattage decide an e-bike's class?

The definitions are written around the motor's rated, continuous output rather than a peak figure, which is why the distinction gets exploited in marketing. Eunorau publishes 1,000 W for this motor without labeling it peak or nominal, so the safest assumption is that 1,000 is the number a reader of the statute would apply.

Can an electric bike really go 200 miles?

Only with enough stored energy and a riding style that matches the claim. Two hundred miles at a realistic 20 Wh/mi needs 4,000 watt-hours. The FLASH 2.0's full three-pack configuration holds 2,808, which is why its 220-mile figure depends on a 12.8 Wh/mi assumption rather than on capacity alone.

Why do advertised e-bike range figures feel misleading?

Because they are quoted at a consumption rate almost nobody rides at, and the listing prints miles rather than the rate behind them. Across the 97 bikes on our shelf that publish a battery and a matching range, the median claim assumes 12.48 Wh/mi. Dividing watt-hours by miles is the fastest way to see what any claim is really asserting.

How do I estimate my own e-bike range?

Take the pack size in watt-hours — volts times amp-hours — and divide by a consumption rate. Use 12 to 15 Wh/mi for light assist on flat ground, 20 to 25 for a heavy fat-tire bike ridden with real power, and 30-plus for throttle-heavy riding on hills.

What warranty does Eunorau give on the FLASH 2.0?

Ten years on the frame, and 24 months on the battery, motor and electrical components, per Eunorau's current warranty page. A superseded page still live on the same site shows shorter terms and a prorated battery; that older page is what the AI answer we ran was quoting.

Is Eunorau a good e-bike brand?

The short answer is below; the measured one is in our Eunorau brand profile, which censuses all 31 models and quotes the current warranty in full.

It publishes more than most makers at this price — full geometry tables, named component models, a written warranty and a certification announcement that names both relevant UL standards. What it does not publish is a certificate for any individual model. On the road the FLASH 2.0 matched its paperwork, and the one warranty event on the bike we rode was handled by Eunorau without argument.

Has the Eunorau FLASH 2.0 been recalled?

No CPSC recall names Eunorau or this model, checked August 31, 2026 on an instrument validated the same day against a brand that does carry a recall, and corroborated independently. None of which amounts to a clean safety record: recalls and safety warnings are separate instruments and the warnings index could only be partly read.

Is the Eunorau FLASH 2.0 UL certified?

Eunorau states "UL CERTIFIED: Yes" on the product page without naming a standard there, and a March 2023 announcement says its bikes "passed the UL 2849 testing" and its batteries the UL 2271 tests. No certificate number, laboratory or issue date is published for this model. Ask us and we will request it in writing.

What is the difference between the FLASH 2.0, the FLASH AWD 1.0 and the FLASH LITE 2.0?

The drive system, and nothing else that matters. The 2.0 is a 1,000 W mid-drive at $2,499; the AWD 1.0 runs dual 750 W hub motors at $2,099; the LITE 2.0 is a single 750 W rear hub at $1,899. All three share the frame, the battery bays, the 20 mph limit and the same published range table.

Which electric bike has the longest range?

It depends entirely on how much battery you are willing to carry and pay for. Makers currently advertising 200-plus miles do it with multi-pack systems, and the comparison worth making is in watt-hours: the FLASH 2.0's full 2,808 Wh against, for instance, the 3,640 Wh a competitor publishes for the same claimed 220 miles.

Does the Eunorau FLASH 2.0 have a throttle?

Yes — a thumb throttle, alongside five levels of torque-sensor pedal assist; on our long throttle-only stretches the thumb tired, so plan on the assist doing most of the work. A throttle is also the feature the three-class system uses to separate Class 2 from Class 1, so it is worth knowing before you check your state's rules.

What size rider does the Eunorau FLASH 2.0 fit?

Eunorau publishes a recommended range of 5'2" to 6'4", with a 30.7 in standover and a 33.1 in seat height. The 20-inch wheels are why that span is so wide: a smaller wheel drops the whole frame, which is what lets one size cover fourteen inches of rider.

The bottom line

Buy it if you want the battery bays. That is the honest one-sentence verdict on this machine. The frame, the mid-drive and the fat tires are all competent at $2,499; what nothing else near the price offers is somewhere to put 2,808 watt-hours. Distance is the whole argument here, and the reviews index shows that figure against the battery capacity of every other bike we have reviewed.

And buy it knowing what the ride found: the paperwork holds up on the road, and the one warranty event on the bike we rode was handled by Eunorau without argument.

The 220-mile headline is the reason people find this bike, and it turns out to be the least interesting thing about it. Eunorau's arithmetic holds together — 12.76 Wh/mi across three packs against 12.80 across one — and that consistency is the reason the big number deserves the same reading as the small one.

The catch is that 12.8 Wh/mi is the whole industry's convention and not this maker's exaggeration, and it describes a way of riding that a 90-pound fat-tire moto bike is not built for. Plan on 20 to 25 Wh/mi and the numbers become 112 to 140 miles fully loaded — a remarkable distance, and not the one on the box.

Two things should stop a purchase rather than qualify it.

The first is the motor. A thousand watts places this outside the federal definition and outside most states', which is a fact about where you may ride and not about how well the bike is made; if your state is one of them, the FLASH LITE 2.0 is the same frame at 750 W.

The second is that we cannot sell you the two packs the headline depends on; tell us the configuration you want and we will say where the packs are available that week. Buying this bike for a range you then cannot assemble is an outcome we would rather prevent than process.

Everything else is a good bike sold with unusually complete paperwork, backed by a warranty that is better than the internet currently believes.

832 Wh in the box · 220 N·m mid-drive · 440 lb payload · $225.56 a month for 12 months at 15% APR on the sample plan, subject to eligibility. Lunar Dust on this button, Moon Black here. Not sure it is the right bike? Call (213) 444-4020 or email support@redtailebikes.com and we will tell you straight, including when the answer is a different machine.

Buy in Lunar Dust — $2,499

Primary sources

  1. Eunorau. FLASH 2.0 product page and specification table. Retrieved August 31, 2026, and re-read September 19, 2026. https://eunorau-ebike.com/products/flash-2
  2. Eunorau. 24-Month+ Limited Warranty (current policy). Retrieved August 31, 2026, and re-read September 19, 2026. https://eunorau-ebike.com/pages/warranty
  3. Eunorau. Warranty Policy (superseded; last Internet Archive capture September 15, 2025). Retrieved August 31, 2026. https://eunorau-ebike.com/pages/eunorau-warranty
  4. Eunorau. "Great News: Eunorau E-Bikes Now Come with a 2-Year Warranty!" Effective August 1, 2023. Retrieved August 31, 2026. https://eunorau-ebike.com/blogs/news/great-news-eunorau-e-bikes-now-come-with-a-2-year-warranty
  5. Eunorau. "We are UL 2849 tested and UL 2271 tested!" March 5, 2023. Retrieved August 31, 2026. https://eunorau-ebike.com/blogs/news/we-are-ul-2849-tested-and-ul-2271-tested
  6. Eunorau. 52V 21Ah Secondary Battery for FLASH Ebike, $699. Retrieved August 31, 2026. https://eunorau-ebike.com/products/eunorau-52v21ah-secondary-battery-for-flash-ebike
  7. Eunorau. 52V 17Ah Third Battery for FLASH Ebike, $599. Retrieved August 31, 2026. https://eunorau-ebike.com/products/eunorau-flash-third-52v17ah-battery
  8. United States Code. 15 U.S.C. § 2085(b), definition of "low-speed electric bicycle". Retrieved August 31, 2026. https://www.law.cornell.edu/uscode/text/15/2085
  9. Code of Federal Regulations. 36 CFR § 1.4, definition of "electric bicycle". Retrieved August 31, 2026. https://www.ecfr.gov/current/title-36/chapter-I/part-1/section-1.4
  10. Official Code of Georgia Annotated. § 40-1-1(15.3), definition of "electric assisted bicycle". Retrieved August 31, 2026. https://law.justia.com/codes/georgia/title-40/chapter-1/article-1/section-40-1-1/
  11. Georgia General Assembly. HB 454 (signed legislation; the repealed 1,000-watt definition). Retrieved August 31, 2026. https://gov.georgia.gov/document/signed-legislation/hb-454pdf/download
  12. U.S. Consumer Product Safety Commission. Recall 24075, "Ride Aventon Recalls Sinch.2 Folding E-Bicycles Due to Crash and Injury Hazards", January 4, 2024 — used as the positive control validating our recall query. Retrieved August 31, 2026. https://www.cpsc.gov/Recalls/2024/Ride-Aventon-Recalls-Sinch2-Folding-E-Bicycles-Due-to-Crash-and-Injury-Hazards
  13. U.S. Consumer Product Safety Commission. Recall database, saferproducts.gov REST service, queried for Eunorau. Retrieved August 31, 2026. https://www.saferproducts.gov/RestWebServices/Recall
  14. UL Standards & Engagement. UL 2849, Standard for Electrical Systems for eBikes. Retrieved August 31, 2026. https://www.shopulstandards.com/ProductDetail.aspx?productId=UL2849
  15. Redtail eBikes. Shipping policy. Retrieved August 31, 2026. https://redtailebikes.com/policies/shipping-policy
  16. Redtail eBikes. Refund and return policy. Retrieved August 31, 2026. https://redtailebikes.com/policies/refund-policy
  17. Redtail eBikes. Eunorau FLASH 2.0 product listing — price, colorways, inventory and the full specification and geometry tables. Retrieved August 31, 2026; price, availability and the rendered Shop Pay sample plans re-read September 19, 2026. https://redtailebikes.com/products/eunorau-flash-2
  18. Redtail eBikes. Live catalog, read through the Shopify Admin API — 208 active listings tagged as e-bikes (207 e-bikes once a pedal-less balance bike is set aside), the basis of the Wh-per-mile census. Retrieved August 31, 2026, and recounted September 19, 2026. https://redtailebikes.com/collections/all-ebikes
  19. Oregon Legislative Assembly. Oregon Revised Statutes chapter 801 — ORS 801.258 ("electric assisted bicycle", which sets no wattage figure) and ORS 801.348 ("motor assisted scooter", where the 1,000-watt cap lives). Retrieved August 31, 2026. https://www.oregonlegislature.gov/bills_laws/ors/ors801.html
  20. Redtail eBikes. Oregon e-bike laws (2026). https://redtailebikes.com/blogs/journal/oregon-ebike-laws
  21. Redtail eBikes. Georgia e-bike laws (2026). https://redtailebikes.com/blogs/journal/georgia-ebike-laws
  22. r/ebikes. Public discussion, harvested via the pullpush.io archive and quoted where noted. Retrieved August 31, 2026. https://reddit.com/r/ebikes
  23. Redtail Electric Bikes USA. "Eunorau FLASH 2.0 Review: 1000W Mid-Drive Fat Tire eBike in Fall Mud", 6:14, our own footage, published September 17, 2026. https://www.youtube.com/watch?v=3yrdBJShXSA
  24. Redtail Electric Bikes USA. "The Motor Doesn't Turn the Wheel | Eunorau FLASH 2.0 in the Rain", 2:41, our own footage, published September 17, 2026. https://www.youtube.com/shorts/BOp6n0k3n8o
  25. Eunorau. EUNORAU Rear Rack for FLASH Ebikes, $59 — "25 kg (55 lbs)", "Cargo Only", "NOT recommended for passengers or sitting". Retrieved September 19, 2026. https://eunorau-ebike.com/products/rear-rack-for-eunorau-flash-ebikes

Image credit: the cover of this page and its in-body card are plates generated with Playcut and composited by hand; every other photograph is Eunorau's own, and the video is ours.

Reviewed by Milad Ghobadibeygvand, BScN (Western University, 2014), who rode this bike. Verified September 19, 2026. We sell this bike; every claim above is sourced to a document you can open, and corrections go to support@redtailebikes.com and are published on this page.