Ebike Oracle

Review · ASKGO

mountain8.2/10

ASKGO S9

By John WeeksUpdated Aug 31, 2026How we score

Spec-verified against the manufacturer listing

Our verdict

8.2
/ 10

The ASKGO S9 is a high-volume fat-tire e-bike that carries a 960 Wh battery for $449.99, which is roughly double the pack most bikes at this price ship with, on 20x4 tires with a full-size 2500 W peak motor. The catch is printed on the listing: it advertises 36 mph (an older ASKGO listing for the same bike said 28 mph), and either figure puts it outside the US three-class system once you add the throttle. Buy it as a fast private-land and trail bike, not as a compliant commuter.

Best for
Private land, OHV trails and riders who are not relying on public bike-path access

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Ranked #4 in Fastest Electric Bikes on Amazon (2026), Ranked by Speed.

ASKGO S9
Motor
2500W
Battery
960Wh
Range
40mi
Top speed
36mph

The numbers

ASKGO S9 is a electric mountain bike that scores 8.2/10 on our editorial rubric, last verified on August 31, 2026. Amazon lists it at $450 right now. On Amazon it currently ranks #33 Best Seller in Electric Bicycles. It pairs a 2,500 W hub motor with 90 Nm of torque and a 960 Wh battery, good for a claimed range of up to 40 miles and assisted speeds up to 36 mph. It best suits private land, OHV trails and riders who are not relying on public bike-path access.

Pros

  • + 960 Wh battery (48 V x 20 Ah) at $449.99, roughly double the pack most bikes at this price ship with
  • + The 65-mile range claim is arithmetically plausible at 14.8 Wh/mi, unlike the same claim on ASKGO's cheaper bike
  • + 2500 W peak with a stated 90 N.m of torque, on 20 x 4 puncture-resistant fat tires
  • + NFC card unlock, cruise control, integrated head and brake lights, sunlight-readable LCD
  • + 80% pre-assembled in a case with a tool kit, 12-month warranty

Cons

  • - Advertised at 36 mph, and ASKGO listings for the same bike have also said 28 mph
  • - Either figure sits outside the US three-class system once you add the throttle, this is not a compliant commuter
  • - The linked listing states only the 2500 W peak; a 750 W continuous figure appears only on a pricier S9 listing
  • - "Full suspension" is a front fork plus a sprung seatpost, so it is a hardtail
  • - This listing names no UL certification, though other ASKGO listings do

Who is this for?

  • Private land, OHV trails and riders who are not relying on public bike-path access
  • Anyone who wants the largest battery on Amazon under $500 and will plan on a real 35-45 miles
  • Buyers who want fat-tire stability and torque and are reading the class rules with their eyes open

The 30-second verdict

The number that makes this bike interesting is 960 Wh (48 V x 20 Ah, stated plainly on the listing) for $449.99. At this price the norm is 400-500 Wh. Doubling the pack is the single most expensive thing a manufacturer can do, and it is the specification that decides whether an e-bike is still useful on the third day of owning it rather than just the first. Against that: the listing advertises a speed that fits no US class, and ASKGO listings for this same bike have disagreed about which speed it is.

The full review, section by section. Tap any section to read it.

The range claim is plausible here, and that is unusual

This matters more than it normally would, because of what we found on ASKGO's other best-seller. The ASKGO Mountain 26 claims 65 miles from a 499 Wh pack, which needs 7.7 Wh per mile, less than half what any e-bike achieves, so that number is arithmetically impossible. This bike claims the same 65 miles from 960 Wh, which is 14.8 Wh per mile. Optimistic, but real: that is roughly the figure a light rider gets on flat ground in the lowest assist level, pedalling throughout. Plan on 35-45 miles in mixed use and the pack will not embarrass itself. The difference between a claim you should ignore and one you can plan around is the whole point of reading the arithmetic.

What else $449.99 buys

The rest of the sheet is more than this price usually carries: a 2500 W peak motor with a stated 90 N.m of torque, 20 x 4 inch puncture-resistant fat tires, dual disc brakes, integrated headlight and brake light, cruise control, a sunlight-readable LCD, and NFC unlock, tap a card and go, no key. It arrives 80% assembled in a case with a tool kit, backed by a 12-month warranty.

The part that decides whether you can legally ride it

ASKGO has been inconsistent on the single most important number: an earlier S9 listing was titled 28 mph while its bullets said 36 mph, and the listing we link now says 36 mph throughout. Neither figure places this bike inside the US three-class framework. Class 1 and Class 2 cap at 20 mph. Class 3 permits 28 mph but is pedal-assist only in most states, and this bike has a throttle. So at 28 mph with a throttle it fits no class, and at 36 mph it is not a bicycle in any state. The listing we link states no rated wattage, only the 2500 W peak, and the federal definition at 15 U.S.C. § 2085 is written around a 750 W rated figure. A pricier S9 listing does add "continuous power 750W" in a note, which is encouraging, but at 36 mph with a throttle the speed alone keeps it outside every class.

In practice: on private land, on OHV trails where your state permits them, and in the many places where nobody is checking, this is an enormous amount of hardware for $449.99. On a public bike path in a state that enforces the class system, it is not a legal e-bike, and no settings change creates the missing rated figure. Seven states ban Class 3 outright (DC, Kentucky, Massachusetts, Montana, North Carolina, Pennsylvania and South Carolina), and this bike sits above Class 3. Check your own state on our street-legal-by-state guide before you buy.

Two things the listing words carefully

First, "full suspension system (front shock absorber and seat shock absorber)" is not rear suspension. A sprung seatpost damps buzz through the saddle and does nothing for the rear wheel's grip on rough ground. Read it as a hardtail with a comfortable seatpost, which is normal at this price.

Second, this listing names no UL certification, although ASKGO does state UL 2849 on other listings in its range. That is a disclosure gap rather than a known failure, but if you charge indoors it is the gap that matters.

ASKGO S9

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Frequently asked questions

Is the ASKGO S9 street legal?

Not as a bicycle in most places. The listing advertises 36 mph (an earlier ASKGO listing for this bike said 28 mph) and adds a throttle. In the US three-class framework, Class 1 and Class 2 cap at 20 mph, and Class 3 allows 28 mph but is pedal-assist only in most states. A 28 mph throttle bike therefore fits no class, and a 36 mph bike is not a bicycle at all. The linked listing states no rated wattage, only a 2500 W peak; the federal definition is written around 750 W rated, and while a pricier S9 listing notes 750 W continuous, the speed alone keeps it outside every class. Check your state on our street-legal-by-state guide.

Will it really do 65 miles?

Not in normal riding, but the claim is not impossible here, which is unusual at this price. 65 miles from a 960 Wh pack works out at 14.8 Wh per mile, achievable for a light rider on flat ground in the lowest assist level, pedalling throughout. Plan on 35-45 miles in mixed use with some throttle. For contrast, the cheaper ASKGO Mountain 26 claims the same 65 miles from a 499 Wh pack, which needs 7.7 Wh/mi and is arithmetically impossible.

Does the ASKGO S9 have real rear suspension?

No. The listing says "full suspension system (front shock absorber and seat shock absorber)". A suspension seatpost damps vibration through the saddle; it does nothing for the rear wheel's contact with the ground. Treat this as a hardtail with a sprung seatpost, normal and acceptable at $449.99, but not equipment for descending.

Is the ASKGO S9 UL certified?

This listing does not say so. Other ASKGO listings state UL 2849 explicitly, so the absence here is a disclosure gap rather than a known failure, but we will not infer a certification a listing does not claim. If your building or landlord requires a UL mark to charge indoors, that requirement rules this listing out until ASKGO states it. For bikes that do document it, see our UL-certified picks.

How is the battery this big at this price?

It is the specification ASKGO chose to spend on. 48 V x 20 Ah is 960 Wh, against the 400-500 Wh typical under $500. The trade-offs show up elsewhere on the sheet: mechanical rather than hydraulic disc brakes, a cadence sensor rather than a torque sensor, no published weight or payload rating, and no rated-wattage disclosure. Whether that is the right trade depends on whether range or refinement is what limits your riding.

ASKGO S9
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