Ridstar Q30 Pro 4000W Dual Motor E-Bike

The headline is 4000W, but the interesting part is the layout. Most powerful e-bikes put everything into one rear hub, which means that when the rear wheel loses grip the bike stops making progress. A front-and-rear pair keeps driving through the wheel that still has traction. On sand, snow, wet grass and loose gravel, which are the surfaces 20 x 4.0 fat tyres exist for, that is a bigger practical difference than the wattage.

It costs you range and weight. Two motors and two batteries put the bike around 110 lb, and running both hubs draws current fast. Most riders will spend the majority of their time on rear-drive only and switch the front in when they need it, which is the sensible way to use it.

Ridstar advertises up to 180 miles in pedal-assist mode. The battery capacity is genuine: 52V x 20Ah x 2 = 2,080 Wh, and that is a large amount of stored energy by any standard. But a dual-motor bike on fat tyres carrying 110 lb of hardware draws roughly 28-40 Wh per mile in real use.

2,080 Wh ÷ 34 Wh/mi ≈ 61 miles. The optimistic end is 2,080 ÷ 28 ≈ 74 miles; the pessimistic end, riding hard on both motors, is 2,080 ÷ 40 ≈ 52 miles. So the honest range is 52-74 miles. That is still outstanding, better than almost anything else on this site, and roughly a third of the advertised figure. The 180-mile number would require about 11.5 Wh per mile, which is lighter than a 250W city bike manages. It is not achievable on this machine.

One genuine advantage of the twin-pack layout: the batteries are removable and charge separately, so you can carry a spare indoors and swap rather than waiting on a single long charge.

Federal law defines a low-speed electric bicycle as having a motor of less than 750 watts and a top motor-only speed of 20 mph (16 CFR § 1512.2). The three-class state system that most states have adopted allows assisted speeds to 28 mph for Class 3, still with a 750W motor ceiling almost everywhere. Oregon is the only state that permits 1,000W.

The Q30 Pro's 4000W combined output is more than five times the federal ceiling, and its marketed 38 mph is ten mph beyond the fastest legal class. There is no US state in which this is a Class 1, 2 or 3 e-bike. In practice most states will classify it as a motorcycle or motor-driven cycle, which typically requires registration, a licence, insurance and a DOT helmet, and excludes it from bike lanes, multi-use paths and most trails. Our state law pages explain how each state draws those lines.

Put plainly, because nobody selling it will: this is a private-land and motorised-trail machine, and ridden as a commuter it is a liability. Ridstar's Q50 ($649 on Ridstar's store in November 2026) and Q50 Lite ($549) step down through 2000W and 1000W respectively. Both are still above the line, by less, and we do not recommend either, for the same safety reason as this bike.

Hydraulic dual disc brakes are fitted front and rear, and on a 110 lb machine capable of 38 mph they are not optional. They are the reason the bike is usable. Hydraulic calipers hold their bite when hot and wet in a way cable discs do not. Suspension is a front fork plus rear shock. The frame carries a reinforced saddle pole and the hollow-braced layout Ridstar uses across the Q range.

The batteries carry a stated UL certification and a BMS, which is worth more here than on any other bike in the range simply because there is twice as much cell to manage. Ridstar does not state which UL standard (2271 for the pack, 2849 for the whole electrical system), so a building that asks for certification may still refuse it. Assembly is 90% complete out of the box; the warranty is one year on motor, battery and charger.

On paper the Q30 Pro suits a rider with land or trails where a motorised machine is permitted, who wants two-wheel drive on loose surfaces and would otherwise be looking at electric dirt bikes at twice the money. The dual-motor layout is a real feature. It was never a road or bike-lane machine, and it will not do 180 miles.

We no longer recommend it, or any Ridstar bike. The US Consumer Product Safety Commission has issued two warnings naming Ridstar's manufacturer, Huizhou Xingqishi Sporting Goods Co., Ltd. The March 2026 fire warning tells owners of the Q20 and Q20 Pro to stop using them because the batteries and wires can ignite, and says the company refused to agree to an acceptable recall. The June 2026 crash warning covers the Q20 and Q20 Lite, whose front wheel can come off; CPSC cites 32 reports and 31 injuries and says the company has not responded. Neither warning names the Q30 Pro. Both name the company that builds it, and we do not send readers to a maker that has not agreed to a recall after a fire warning.

When we updated this review in November 2026, the closest in-stock bike we linked to was the ASKGO GT50, from another brand: a 20-inch fat-tyre bike with a 1,200 Wh battery, rear suspension and a stated UL 2849 certification. At a stated 36 mph it is no more road legal than the Q30 Pro, so the legality section above applies to it as well.

Ridstar sells the Q30 Pro on its own website, and we do not link to that store while the CPSC warnings stand. It is not sold on Amazon: we searched by brand and by model in November 2026 and found only spare parts.