Eunorau FLASH LITE ST Review 2026: Step-Thru, 20 MPH

52V 750W rear hub · 92 N·m · 832 Wh LG cells · Class 2 at 20 mph · 4-piston hydraulics · fits 4'8"–6'4" · 82 lb · 440 lb payload · $1,899 · verified August 27, 2026

Quick Answer — The Eunorau FLASH LITE ST is a $1,899 moped-styled e-bike with something almost nothing else in its category has: a step-through frame. It runs a 52V 750W rear hub rated at 92 N·m, ships in Class 2 with a throttle and assist to 20 mph, and stops on four-piston hydraulic discs at both ends. Eunorau publishes a rider-height range of 4'8" to 6'4" and a 440 lb payload, backed by a 10-year frame warranty. Two cautions before you buy: the advertised 100-mile range needs a $699 second battery (plan on 22–46 miles as delivered), and the spec sheet lists "Class 3C" and "Class 4" modes that are not categories in US law. Order the FLASH LITE ST with free contiguous-US shipping, or browse the full Eunorau range.

What's on this page

• Who the FLASH LITE ST is built for
• How we verified this review
• Eunorau FLASH LITE ST specifications
• The class question: what "Class 1/2/3/3C/4" actually means
• The 100-mile claim, and what it really costs
• Real-world range: what to plan on
• Brakes: four-piston hydraulics at this price
• Fit: the step-through that solves the category's problem
• The Mercer fit test
• Weight and carrying capacity
• The battery capacity discrepancy
• Is the battery UL certified?
• Warranty: ten years on the frame
• Before you ride: check your local rules
• The honest ledger
• Who should buy it
• Before you buy: the checklist
• Limitations of this review
• Frequently asked questions
• The bottom line

Who the FLASH LITE ST is built for

There is a specific problem this bike solves, and it is worth naming before anything else.

Moped-styled e-bikes — the ones with the fat tires, the long banana seat and the motorcycle silhouette — are overwhelmingly built with a high top tube and a tall standover. That geometry rules out riders with shorter inseams, riders with hip or knee limitations, and anyone who simply does not want to swing a leg over a 30-inch frame in traffic. The FLASH LITE ST's frame is published as a step-through (Eunorau spec).

When we ran an AI-search panel on "best step-through moped style electric bike" in August 2026, the engine's answer described a step-through frame in this category as "something genuinely rare" and added that high standover "rules them out for a lot of riders." It then named three bikes. The FLASH LITE ST was not among them, and neither was Eunorau.

Our own best electric mopeds in the USA round-up covers the wider category. (panel output archived; model not listed on Eunorau's own reviews tab)

There is the gap. This bike is the moped shape with the barrier removed, and it ships class-compliant at 20 mph rather than in the grey zone where most of its competitors sit. (Maximum Speed: 20 MPH) (federal low-speed definition)

The FLASH LITE ST suits you if you want the moped look and seating position, you want throttle, you want to ride on ordinary bike infrastructure without an argument, and you would rather step through than climb over. (Eunorau spec)

It is the wrong bike if you want speed above 20 mph, if you need to carry it up stairs, or if you want a trail bike. It weighs 82 pounds and rolls on 20-inch wheels. (Bike Weight 82 lbs; 20-inch wheels) If you are still deciding on a format, our electric bike buying guide walks through the trade-offs.

The frame is the whole argument. Where a normal moped-styled e-bike puts a top tube across your path, this one dips to the bottom bracket — which is why the published fit range starts at 4'8". Manufacturer photograph, Ivory colorway.

How we verified this review

This review is built from primary documents. No press kit, no recollection.

What we did. We pulled Eunorau's own FLASH LITE ST product page and archived a deposit copy on 26 August 2026, then extracted every published specification from it verbatim, with no paraphrasing. We downloaded and read Eunorau's warranty, shipping and refund policies as separate documents on the same date. We queried the U.S. Consumer Product Safety Commission's SaferProducts database directly through its API for recalls naming Eunorau. We read the federal statutory definition of a low-speed electric bicycle at 15 U.S.C. § 2085(b) and compared its wording against the state three-class model. We confirmed price, colorways and stock against our own live store records.

What we computed. The energy and range figures in the 100-mile section are ours. We multiplied nominal pack voltage by amp-hours to get watt-hours, then divided by Eunorau's own claimed range to find the efficiency the claim requires. The script and both output datasets are saved and re-runnable.

Sole publisher. Nearly every specification on this page exists only in Eunorau's own publication. There is no independent laboratory or second publisher for a manufacturer's own spec sheet, and we would rather say that than imply a confirmation we do not have. Where a second source does exist — the federal statute, the CPSC database — we used it and named it.

What we did not do. We have not ridden this bike. Every fit, range and performance statement below is a reading of a published number or a calculation from one, and it is labelled as such. Where Eunorau publishes nothing, we say so and leave the gap open.

Neutrality. Redtail sells this bike. Selling it is a reason for more care, and the honest ledger below carries the findings that do not flatter it. Corrections: corrections@redtailebikes.com.

Reviewed by the Redtail editorial desk. Verified 27 August 2026.

Eunorau FLASH LITE ST specifications: what $1,899 buys you

Every figure in this table is quoted from Eunorau's published specification for the FLASH LITE ST 1.0, retrieved 26 August 2026.

Drive side, Ivory. One chainring, one rear sprocket, an aluminum tensioner keeping the chain honest — there is no derailleur to adjust and nothing to shift. The motor is in the rear hub.

The class question: what "Class 1/2/3/3C/4" actually means

This is the most important section on the page, and it needs to be read carefully, because it is easy to get wrong in both directions. (Pedal Assist row)

What the bike does out of the box. It ships in Class 2. Eunorau's specification says "Default: Class 2," its maximum speed row says 20 mph, and its FAQ says the same. Class 2 means a throttle you can use without pedaling, with motor assistance ending at 20 mph. It is the configuration you receive, and it requires nothing from you.

What the spec sheet also says. The Pedal Assist row reads, in full: "Class 1/2/3/3C/4, Default: Class 2." Eunorau's own FAQ expands it:

"The intelligent system supports Class 1, Class 2, Class 3, Class 3C and Class 4 configurations, with Class 2 set as the default. Mode availability and permitted speeds depend on local laws."

Here is the part to read twice. The United States three-class system, which the great majority of states have adopted in some form, has exactly three classes. Class 1 is pedal-assist to 20 mph. Class 2 adds a throttle, still to 20 mph. Class 3 is pedal-assist to 28 mph. There is no "Class 3C" and there is no "Class 4." They are not categories in US law. They are names for settings in this controller's firmware, and Eunorau attaches its own caveat to them: "Mode availability and permitted speeds depend on local laws."

We are not saying the bike is sold in an unlawful configuration. It is not. It arrives in Class 2, which is a real and widely accepted class. (Default: Class 2) (three-class model)

What we are saying is that a menu option labelled "Class 4" does not create a fourth legal class. A rider who selects one of those modes because the name sounds official may be riding something that no longer meets their state's definition of an electric bicycle. (state class definitions)

When a machine stops meeting that definition, it does not become a slightly faster e-bike. It generally falls into whatever vehicle category your state uses next, with the registration, licensing and insurance questions that follow. (federal definition boundary) (state statutes surveyed)

The wattage detail, stated precisely. There is a real seam here worth knowing. The federal definition of a low-speed electric bicycle at 15 U.S.C. § 2085(b) reads "an electric motor of less than 750 watts." Most state three-class statutes instead read "750 watts or less." This bike's motor is rated at exactly 750 watts, which sits on the line between those two phrasings. The federal statute governs how the product is regulated as a consumer product (bicycle definition); your state's statute governs where you may ride it (state survey). We retrieved the federal text twice, from (Cornell LII) and (govinfo). We flag the distinction because it is real and because nobody else does. We do not expect it to trouble you in ordinary use.

What to actually do. Leave it in Class 2.

The round headlight is standard fitment, not an add-on. The red knob on the fork crown is the lockout — worth knowing about before you decide the 60mm of travel feels vague on smooth tarmac.

It is the default, it is the configuration the bike was set up for, and it is the one that keeps the bike inside the definition in essentially every state that has adopted the three-class model. (class adoption by state) If you are curious about the other modes, read your own state's rules first — start with our state e-bike law guides.

The 100-mile claim, and what it really costs

Eunorau's range row reads: "Up to 100 Miles with Dual Battery."

Read the last two words. The 100-mile figure is not a specification of the bike you receive. It describes the bike plus a second battery, sold separately at $699. (Range row and accessory price)

The arithmetic below is our own, computed from Eunorau's published inputs. Nominal pack energy is voltage multiplied by amp-hours. It is nominal rather than usable — no pack is discharged to zero — so every efficiency figure here is the most generous possible reading of Eunorau's own claim. (52V 16Ah standard battery)

Two findings come out of that table.

First, the range tax. Reaching the advertised range means buying a $699 battery on top of a $1,899 bike. The second battery adds a 36.8% increase over the purchase price, taking you to $2,598 all-in. The 100-mile number is achievable, but it is not a $1,899 number.

Second, the efficiency required. Even with both packs, 100 miles demands roughly 19 watt-hours per mile. For context, that is the consumption of a light rider in the lowest assist setting, on flat ground, with the throttle untouched, on a bike of a different shape. An 82 lb machine on 20 × 4.0 fat tires with a thumb throttle does not ordinarily ride that way. The figure is a ceiling reached under ideal conditions, which is what "up to" means and why we are showing you the arithmetic instead of the adjective. (Up to 100 Miles with Dual Battery)

None of this makes the bike a poor buy. It makes the headline number a laboratory number, and you should plan your purchase against the section below instead.

Real-world range: what to plan on

Here is the same 832 Wh pack against the consumption bands that fat-tire e-bikes really ride in.

Plan on 22 to 46 miles from the bike as delivered, and treat the middle row as the realistic everyday expectation. If your routine is a 10-mile round trip, this bike covers it several times over on one charge. If you were buying it because of the number 100, buy the second battery and know that even then 100 miles is the ceiling, never the average.

Note what this table also tells you: the second battery more than doubles usable range at every consumption level,

The pack slides into the rack under the saddle rather than sitting in the frame — which is how a step-through frame this low is possible at all, and why the optional second battery has somewhere to go. because it is the larger of the two packs. If range is genuinely your priority, it is the right accessory — just budget for it at the start instead of discovering it later.

Brakes: four-piston hydraulics at this price

This is the specification we would point to first if someone asked what makes the bike worth its money.

Eunorau publishes four-piston hydraulic disc brakes front and rear, on 180mm rotors at both ends, with motor cut-off switches in the levers.

Four-piston calipers at $1,899 are unusual. Two-piston hydraulics are the normal fitment at this price, and cable-actuated mechanical discs still appear on plenty of bikes costing more. (four-piston hydraulic discs, front and rear)

The reason it matters here is mass. An 82 lb bike with a 440 lb total payload capacity, running at 20 mph on fat tires, is asking a great deal of a brake. (82 lb weight, 440 lb payload) (federal bicycle brake requirement)

More pistons means more pad area and more clamping force for the same lever effort. That shows up as shorter stops and, more importantly, as brakes that do not fade on a long descent. (180mm rotors front and rear)

The motor cut-off switches are a small detail with a large safety function:

Rear disc and 180mm rotor. Eunorau specifies four pistons at both ends; we can confirm from the photography that the hardware is hydraulic and matched front to rear, and we have not counted pistons ourselves.

pulling either lever kills power to the motor, so the throttle cannot fight the brake.

We have not measured this bike's stopping distance and we are not going to imply that we have. What we can say is that the hardware specified is the correct hardware for the weight, and that it is better than the category norm at this price. (brake performance requirements for bicycles)

Fit: the step-through that solves the category's problem

Eunorau publishes a recommended rider height range of 4'8" to 6'4".

It is a wider published range than most manufacturers offer, and it is the direct consequence of the frame design. A step-through 6061 aluminum frame with a low, flat entry does not force a standover compromise, so one frame size can serve a 4'8" rider and a 6'4" rider alike. (Recommended Rider Height 4'8"-6'4")

The long moped-style saddle does the rest, letting riders of very different leg lengths find their own position. Together they make the fit window unusually generous.

We treat published fit ranges as manufacturer guidance, never as gospel, and the fair caveat is that the extremes of any such range are always the least comfortable part of it. A rider at 4'8" and a rider at 6'4" will both fit; neither is in the middle of the design intent. (published fit envelope)

What the step-through geometry actually delivers is easier mounting and dismounting,

From this angle the standover is the story. Nothing crosses the rider's path between the saddle and the bars, which is the difference between swinging a leg over and simply walking into the bike. a lower center of gravity when stopped, and a bike you can put a foot down on in traffic without a hip movement. For older riders, for riders recovering from injury, and for anyone who has ever been intimidated by a tall frame, that is not a convenience feature. It is the reason the bike is buyable at all.

The Mercer fit test

The Mercers are our editorial cast — a fixed set of American riders of different ages, heights and lives that we hold every bike against, so that "who is this for" gets the same answer format every time. You can meet them here.

They are a measuring stick, and none of them is a tester. Every verdict below is read off a published number, never off a ride we did not take, and all of those numbers come from Eunorau's own specification.

For this bike the numbers doing the work are the published rider-height range of 4'8" to 6'4", the 82 lb bike weight, the 440 lb total payload, the step-through frame, and Class 2 at 20 mph. (Eunorau spec)

Eunorau's own photograph, and useful for scale: the long saddle lets riders of quite different leg lengths find a position, which is the mechanism behind that unusually wide published height range. Note the rider is stationary and the bike is parked.

The contrast worth reading twice is Frank and Ruth, because they are the same story with opposite endings. Frank at 63 gets the best bike we have reviewed for him: the step-through entry is precisely the barrier he needs removed, and everything else about the bike suits an upright, unhurried, 20 mph ride. Ruth at 61 fits the frame just as well and is only four inches shorter — and for her the deciding number is not height at all. It is 82 pounds. The same feature that makes the bike easy for her to get on does nothing to make it easy for her to pick up. If you are buying for someone who will occasionally have to move this bike while it is switched off, weigh that before you weigh anything else.

Weight and carrying capacity

Bike weight: 82 lb. Total payload capacity: 440 lb.

The payload figure is generous and is one of the higher numbers in the category. Eunorau publishes it as "Total Payload Capacity," and we want to be precise about a genuine ambiguity: the phrasing does not make clear whether the 440 lb is rider plus cargo, or whether the bike's own 82 lb is counted inside it. Manufacturers use the term both ways. We have not found a document from Eunorau that resolves it. (Total Payload Capacity 440 lbs)

If you are near the limit, ask before you order. We will get the answer in writing from Eunorau instead of guessing at it for you. For most buyers the distinction is academic — even on the stricter reading, 358 lb of rider and cargo is more than the great majority of riders need. (payload and bike weight as published)

The 82 lb weight is the more consequential number in daily life. It is normal for a fat-tire e-moped and no criticism of the bike. (Bike Weight 82 lbs)

It does decide several practical questions. Most trunk-mounted bike racks are not rated for it, carrying it up a flight of stairs is unrealistic, and moving it around a garage is a deliberate act. Plan for ground-floor or garage storage and a hitch-mounted rack if you transport it. (weight as published)

The battery capacity discrepancy

This is a small thing, and it counts because you would be paying $699 for it.

Eunorau publishes the optional second battery's capacity in three places, and they do not agree:

Two of the three say 21Ah, including the name of the product you add to the cart. The specification-table row saying 17Ah is the outlier, and on the balance of Eunorau's own published evidence the accessory is a 21Ah pack. (all three conflicting locations)

We are reporting this rather than resolving it, because we have not opened a pack and we will not state as fact something we have not verified.

The difference is not trivial: 21Ah is 1,092 Wh and 17Ah is 884 Wh, a gap of about 24% in the energy you are paying for. Get the capacity confirmed in writing before you buy the second battery — from us, or from Eunorau. We will chase it for you if you ask. (accessory listing) (return terms)

Standard battery buyers are unaffected. The main pack is consistently published as 52V 16Ah with LG cells, and that is the 832 Wh figure used throughout this review. (52V 16Ah with LG cells)

Is the battery UL certified?

Eunorau's product page carries the line "UL CERTIFIED: Yes." It does not say to which standard.

This matters more than it may sound, because two different standards are in play.

UL 2849 covers the complete electrical system: battery, charger and motor drivetrain together. It is the one New York City's regulations reference, along with a growing number of insurers and building policies. UL 2271 covers the battery pack alone.

A bike can hold one and not the other. "UL certified" without a number does not tell you which you have.

We went looking. The UL page at https://www.eunorau-ebike.com/pages/ul-certification returns a 404 error as of 27 August 2026, so the certification page is not currently reachable.

We print that URL as plain text rather than as a link, because a path that does not resolve is evidence and not a citation. We did not find a published certificate, a UL file number, or a listing reference for this model. (the claim as published)

So we will state the position plainly rather than dress it up: Eunorau asserts UL certification for this bike and we were not able to verify which standard that assertion refers to.

That is not the same as saying the claim is untrue, and it is not the same as saying the bike is uncertified. It means the document that would settle it is not published where a buyer can find it. (UL 2849, full electrical system) (UL 2271, battery pack)

If a specific standard is a requirement for you — because you live in New York City (our New York e-bike law guide covers the state rules alongside the city's battery requirements), because your building or insurer demands UL 2849, or because you simply want the paperwork — ask us before you order and we will request the certificate from Eunorau in writing. If it does not arrive, we will tell you that too. (UL 2849)

One piece of adjacent good news, from a source that is genuinely authoritative. We queried the U.S. Consumer Product Safety Commission's SaferProducts recall database directly on 27 August 2026 for recalls naming Eunorau.

There are none. We ran the query on two separate fields and both returned zero, and a control query for "bicycle" returned 431 records on the same call — so the zero is a real absence and not a query that silently failed. No Eunorau product has been recalled.

Warranty: ten years on the frame

Eunorau's published warranty is the strongest we have found on any bike we have reviewed. We checked that rather than assumed it: across our six published reviews the next-longest frame term is five years and the rest sit at 12 to 24 months.

Read the exclusions, because they are where warranties live or die.

A ten-year frame warranty is easier to offer when the frame is doing less work than the drivetrain. This is about as simple as an e-bike drivetrain gets: one ring, one sprocket, a KMC chain.

Eunorau's policy states that the warranty "only covers manufacturing defects and does not include usual wear & tear and labor cost." Consumables are not covered — tires, brake pads, cables, tubes and the like are wear items everywhere in this industry, and this is the normal position, not a mean one. The labor exclusion is worth planning for: parts arrive free, fitting them is yours or your shop's. (Eunorau warranty)

There is one clause that catches people out and that we have not seen flagged anywhere else. Eunorau's policy states that bikes used commercially — delivery services and sharing programs are named specifically — are "subject to a 50% reduction of the standard Warranty period." (Eunorau warranty)

If you are buying this to deliver food on, your 24-month electrical coverage is 12 months and your 10-year frame coverage is five. The term is legitimate and Eunorau publishes it openly. It is simply not something a buyer expects to find, so find it now, before a claim. (Eunorau warranty) (returns)

Shipping, from the same policy set: processing takes 1–3 business days, and shipping to the contiguous United States is free.

Buying it from us

We stock both colorways — Ivory and Midnight Black — at $1,899 with free contiguous-US shipping, alongside the rest of the Eunorau range.

Midnight Black, the second of the two colorways we stock. The brown sidewalls and tan saddle carry across both finishes.

Eunorau is one of the seven brands we will actually recommend, and our e-bike brands guide explains how that list is drawn.

If a warranty claim comes up, you deal with us and we coordinate with Eunorau. You are not left emailing a manufacturer on your own. And if you ask us something we cannot answer from a document, we will go and get the document instead of guessing — the same standard this review was written to. (current price and stock) (shipping terms)

Before you ride: check your local rules

The bike ships in Class 2 at 20 mph, which is the friendliest configuration US law offers a throttle e-bike. That still leaves questions only your own state and city can answer. (state-by-state survey) (class access rules)

• Class 2 access is not universal on paths. Most states allow Class 1 and Class 2 wherever bicycles go, but individual parks, trail networks and municipalities restrict throttle use. Check the specific path as well as the state. California riders should start with our California e-bike law guide, which is the strictest of the big-market states on throttle access.
• Minimum age rules apply in a number of states, commonly 16 for throttle-equipped bikes. This is the deciding question for a teenage rider.
• Helmet requirements vary by age and by class, and several states require them for Class 3 regardless of age.
• The other firmware modes change the analysis. Everything above assumes the Class 2 default. Selecting a mode Eunorau labels "Class 3C" or "Class 4" may put the bike outside your state's definition of an electric bicycle entirely — see the class section.

Our state-by-state e-bike law guides cover the statutes, the age rules and the path access rules, with the primary sources cited so you can check us. (legislative primer)

The honest ledger

Green flags

• It steps through, in a category where almost nothing does. This is the bike's reason to exist and a genuine differentiator, never merely a marketing angle.
• Four-piston hydraulic discs front and rear, 180mm rotors, motor cut-off levers — brake hardware above the class norm at $1,899, on a bike whose weight needs it.
• A published rated wattage. 750W rated, with 92 N·m of torque. A significant number of competitors publish a peak figure dressed up as a rating, which is the less honest number — our e-bike motor guide explains the difference and why it matters at a traffic stop.
• Ships in Class 2 as the factory default — no mode change, no ambiguity, no grey-zone purchase.
• A published rider-height range of 4'8" to 6'4", which is wider and more specific fit data than most makers provide.
• 10-year frame warranty, plus 24 months on battery, motor and electrics.
• Zero CPSC recalls for Eunorau, confirmed against the federal database instead of assumed.
• LG cells named in the main battery, and a 50A BMS with a discharge fuse.

Red flags

• The 100-mile range figure requires a $699 second battery — a 36.8% add-on — and even then demands roughly 19 Wh/mi, which is an ideal-conditions number. No single-battery range is published at all.
• The second battery's capacity is published inconsistently: 21Ah in two places, 17Ah in the spec table. The gap is roughly 24% of the energy you would be paying for.
• "UL CERTIFIED: Yes" names no standard, and Eunorau's own UL page returns a 404. We could not determine whether that means UL 2849 or UL 2271.
• The spec sheet lists "Class 3C" and "Class 4" modes, which are not categories in US law. Eunorau does caveat them, but the labels invite a rider to assume a legitimacy those settings do not carry.
• 82 pounds. Fine to ride, awkward to move when it is off, and beyond most trunk-mounted racks.
• "Total payload capacity" is ambiguous as published — it is not clear whether the bike's own weight is inside the 440 lb.
• Commercial use halves the warranty, which matters if you are buying it to work on.
• A 60mm fork and 20-inch wheels make this a street bike. It is not a trail machine, whatever the fat tires suggest.

Who should buy it

Buy it if you want the moped shape without the moped standover; if you are over 55, or shorter, or have a hip or knee that objects to swinging a leg over a frame; if you want throttle and want to stay inside Class 2; if you commute or run errands within about 30 miles a day; or if you want brake hardware that is honestly specified for the weight it is stopping.

Buy it and add the second battery if your real routine is 40 miles or more in a day. Budget $2,598 instead of $1,899 and you will be happy with the outcome.

Do not buy it if you want to go faster than 20 mph — nothing here should be read as encouragement to use the higher firmware modes to get there. Do not buy it if you need to carry a bike up stairs, if you want to ride singletrack, or if you are buying primarily because of the number 100.

Wait and ask first if UL 2849 specifically is a requirement where you live or where you park. Ask us for the certificate before you order.

Before you buy: the checklist

• [ ] Confirm your height is inside 4'8"–6'4", and if you are near either end, ask us for the standover measurement.
• [ ] Move an 82 lb bike, or accept that you will not need to.
• [ ] Decide on the $699 second battery now, based on the range table above rather than the headline.
• [ ] If you buy the second battery, get its capacity in writing — 21Ah or 17Ah.
• [ ] If UL 2849 matters to you, request the certificate before ordering.
• [ ] Check your state's minimum age rule if a rider under 18 will use it.
• [ ] Check path and trail access for throttle bikes on the specific routes you ride.
• [ ] Plan storage and transport: ground floor or garage, hitch rack over trunk rack.
• [ ] If this is for commercial use, note the 50% warranty reduction before you commit.
• [ ] Leave the bike in its Class 2 default.

Limitations of this review

1. We have not ridden this bike. Every performance, fit and comfort statement is a reading of a published specification or a calculation from one. No ride impressions appear anywhere on this page because we have none to offer.
2. The range tables are arithmetic rather than measurement. They use nominal pack energy against consumption bands typical of fat-tire e-bikes. Your terrain, weight, tire pressure, temperature and assist level will move the result.
3. The UL question is unresolved. We report the claim and the 404, and we do not assert either that the bike is or is not certified to a given standard.
4. The second-battery capacity is unresolved and we have reported the contradiction without picking a side beyond noting where the weight of evidence sits.
5. The payload definition is unresolved — whether 440 lb includes the bike's 82 lb is not published.
6. No search-volume figures appear on this page. Our keyword data source returned a zero balance and we do not publish numbers we cannot source.
7. State law changes. The legal framing here is current to 27 August 2026 and states amend these statutes regularly.
8. Expiry: re-verify this page if Eunorau revises the specification, publishes a UL certificate, changes the warranty, or if the price moves. Re-check the legal sections each legislative season.

The source register

No T5 sources — aggregators, AI summaries, competitor retail copy — are cited anywhere on this page.

Frequently asked questions

Is the Eunorau FLASH LITE ST street legal?

As delivered, it is configured as a Class 2 electric bicycle: throttle-equipped, with assistance ending at 20 mph. Class 2 is recognized in the great majority of US states and is the configuration most states permit on roads and bike lanes. Path and trail access varies locally, and the firmware's other modes may take the bike outside your state's definition (state definitions) — see the class section.

What does "Class 3C" and "Class 4" mean on the spec sheet?

They are names for settings in the bike's controller. Neither is a legal category: the US three-class system has Class 1, Class 2 and Class 3. Eunorau's own note says mode availability and permitted speeds depend on local laws. Leave the bike in its Class 2 default. (Pedal Assist row) (the three classes)

How fast does the Eunorau FLASH LITE ST go?

Eunorau publishes a maximum assisted speed of 20 mph, and the bike ships set to it.

What is the real range of the Eunorau FLASH LITE ST?

Plan on 22 to 46 miles from the standard 832 Wh battery depending on how you ride, with roughly 33 miles as a realistic mixed-riding expectation. The advertised "up to 100 miles" describes the bike fitted with an optional second battery that costs $699 extra, and it assumes ideal conditions. (Range row)

Does the FLASH LITE ST come with two batteries?

No. It ships with one 52V 16Ah battery. The second battery is a $699 accessory, and it is required for the advertised 100-mile range.

What size rider does the Eunorau FLASH LITE ST fit?

Eunorau publishes a recommended rider height range of 4'8" to 6'4". The step-through frame is what makes a range that wide possible on a single frame size. (Recommended Rider Height)

How much weight can the Eunorau FLASH LITE ST carry?

Eunorau publishes a total payload capacity of 440 lb. The wording does not make clear whether the bike's own 82 lb is counted within that figure; ask before ordering if you are near the limit. (Total Payload Capacity)

How much does the Eunorau FLASH LITE ST weigh?

82 pounds. That is typical for a fat-tire e-moped and it is the number to plan storage and transport around.

Does the Eunorau FLASH LITE ST have a UL-certified battery?

Eunorau states "UL CERTIFIED: Yes" but does not publish which standard, and its own UL certification page returns a 404 error as of 27 August 2026. We could not verify whether that refers to UL 2849 (the full electrical system) or UL 2271 (the battery pack). If a specific standard is a requirement for you, ask us to request the certificate before you order. (UL 2849) (UL 2271)

Has the Eunorau FLASH LITE ST been recalled?

No. We queried the CPSC SaferProducts database directly on 27 August 2026 and found no recalls for any Eunorau product.

What is Eunorau's warranty?

Ten years on the frame, and 24 months each on the battery, motor and electrical components. It covers manufacturing defects only, excluding wear items and labor. Commercial use — delivery and sharing programs are named — reduces the warranty period by 50%. (Eunorau warranty)

Is the FLASH LITE ST good for seniors?

It is one of the better options we have reviewed for older riders, because the step-through frame removes the mounting barrier that rules out most moped-styled bikes, and the Class 2 default keeps it at an unhurried 20 mph. The caveat is the 82 lb weight: easy to ride, awkward to move when switched off. See the Mercer fit test. (weight and fit as published)

Can a 16-year-old ride it?

Height-wise, yes, comfortably. Legally it depends on your state — a number of states set a minimum age of 16 for throttle-equipped Class 2 e-bikes and some restrict throttle use further. (state age rules) Check our state law guides before handing over the keys.

Is the FLASH LITE ST good for trails?

Not really. Despite the 20 × 4.0 fat tires, it has a 60mm suspension fork and 20-inch wheels, which make it a street and hard-pack machine. Fat tires here buy comfort and stability. They do not buy off-road capability. (60mm fork, 20-inch wheels)

The bottom line

The Eunorau FLASH LITE ST is the moped-styled e-bike for people the moped category normally excludes, which is a genuinely useful thing to be.

The step-through frame is no styling variation. It is the whole product thesis, and an AI-search panel we ran in August 2026 called that configuration "genuinely rare" in this category while naming three competitors that do not offer it. (step-through frame as published)

At $1,899 you also get four-piston hydraulic brakes at both ends, an honestly published 750W rated motor with 92 N·m, LG cells, a 440 lb payload, a fit range from 4'8" to 6'4", and the strongest frame warranty we have found anywhere: ten years. (Eunorau warranty) (motor and brake specs)

It ships in Class 2 and should stay there. The firmware's "Class 3C" and "Class 4" labels describe settings. Neither names a legal category, and we would rather you hear that from us than discover it from a police officer. (class definitions by state)

The two things we would want a buyer to know before paying are both about numbers that are not what they appear. The 100-mile range is a dual-battery figure requiring a $699 accessory, which is 36.8% on top of the bike; plan on 22 to 46 miles as delivered. And the second battery's capacity is published two different ways, so get it in writing before you buy one. (the conflicting listings)

Buy it if the step-through entry solves a real problem for you and a 20 mph Class 2 bike fits your riding. That describes a lot of people, and almost nothing else in this shape serves them.

Primary sources

1. Eunorau. FLASH LITE ST 1.0 — product specification. eunorau-ebike.com/products/flash-lite-st. Retrieved 26 August 2026; deposit copy archived. Source of all published specifications, the "Class 1/2/3/3C/4, Default: Class 2" wording, the "Up to 100 Miles with Dual Battery" range claim, the $699 secondary-battery price, and the "UL CERTIFIED: Yes" statement.
2. Eunorau. 24-Month+ Limited Warranty. eunorau-ebike.com/pages/warranty. Published 11 August 2023; retrieved 26 August 2026; deposit copy archived. Source of the 10-year frame term, the 24-month component terms, the defects-only and labor exclusions, and the 50% commercial-use reduction.
3. Eunorau. Shipping Policy. eunorau-ebike.com/policies/shipping-policy. Retrieved 26 August 2026; deposit copy archived. Source of the 1–3 business day processing time and free contiguous-US shipping.
4. Eunorau. Refund Policy. eunorau-ebike.com/policies/refund-policy. Retrieved 26 August 2026; deposit copy archived.
5. UL certification page — https://www.eunorau-ebike.com/pages/ul-certification. Printed as plain text and not hyperlinked: the path returned HTTP 404 on 27 August 2026, and a URL that does not resolve is evidence rather than a citation. Returns HTTP 404 as of 27 August 2026, and is deliberately not linked here: a dead URL is evidence, never a citation. Cited as the affirmative evidence for the unresolved UL finding: the absence is recorded as a response status rather than as a failure to find.
6. United States. 15 U.S.C. § 2085(b) — Low-speed electric bicycles. law.cornell.edu/uscode/text/15/2085. Retrieved 27 August 2026. Source of the federal "less than 750 watts" definition. Corroborated against govinfo.gov.
7. U.S. Consumer Product Safety Commission. SaferProducts recall database. saferproducts.gov/PublicSearch. Queried through the REST API on 27 August 2026 on two separate fields, RecallTitle=Eunorau and ProductName=Eunorau; both returned zero records. A control query, RecallTitle=bicycle, returned 431 records on the same call, which is what establishes that the zero is a real absence and not a broken query.
8. Redtail eBikes. Eunorau FLASH LITE ST — live store record. redtailebikes.com/products/eunorau-flash-lite-st. Retrieved 27 August 2026. Source of price, colorways and stock. Sole publisher: these are facts about our own store and no second independent source exists, which is why they are dated in the sentence.
9. Redtail eBikes editorial desk. FLASH LITE ST range-claim computation. First-party dataset, scripts/flash_lite_st_range_math.py with outputs in research/eunorau-flash-lite-st/datasets/, computed 27 August 2026. Published with this review at redtailebikes.com/blogs/journal/eunorau-flash-lite-st-review. Source of all watt-hour, watt-hour-per-mile, range-band and percentage figures.
10. Redtail eBikes editorial desk. AI-search panel, Eunorau FLASH LITE ST. Claude Code WebSearch (US), run 27 August 2026; prompt and raw output archived verbatim. Graded T3 and used only to characterise the competitive gap, never as evidence of a product fact.