A conversion kit's rating is only as trustworthy as the people behind it, and a wall of five stars isn't the same thing as an owner base. Budget listings collect ratings fast when a promotion runs, so the number to read is the shape of the record under the score, not the score itself.
The SRTYGHW 36V 750W kit is a thumb-throttle front-hub build that sits near the bottom of the price range of the kits we track. Its rating reads 5.0 out of 5, which sounds like a green light until you count what's under it: three ratings, two written texts, neither badged as a confirmed purchase, and both reading like the listing's bullets set to prose.
Look inside the listing and the puzzle deepens. The title promises a kit for eight wheel sizes, the parts list ships one 24 inch wheel, and the spec table calls the wheel 20.47 inches. This review works through the record, the fit claim, the speed arithmetic, the throttle-only parts list, and the motor the listing can't decide it has.
The verdict, straight: the SRTYGHW 750W front hub conversion kit lands in the cheapest fifth of the conversion kits we track and its 750W motor sits exactly at the wattage cap most US states allow, but the perfect rating rests on two unverified texts that restate the bullets, and the listing can't decide which wheel it actually ships. If you buy it, you're buying the spec sheet, so measure your fork and keep the return window open.
A five-star record built on two unverified texts
Three ratings, all five stars, and two texts to explain them. Neither text carries a confirmed-purchase badge. Both walk the listing's claims in order: the August text praises the speed control in almost the same words as the speed-control bullet, right down to the three built-in Hall sensors and a thumb throttle with no sudden acceleration.
The July text covers the materials bullet, aluminum, steel and alloy, rust-resistant, and the load claim, holding 100kg without deformation.
The dates matter too. The July text is dated July 7, 2026, which is the exact date on all four unverified texts we found on the SRTYGHW 1000W kit, a sibling listing we rebuilt earlier this year.
Two listings, five texts dated the same day, none from a confirmed purchase, each paraphrasing its own bullets. That pattern doesn't prove anything dishonest happened, but it's consistent with a promotion rather than a fan base, and it means the record holds no install story, no range figure, no noise account, and no complaint of any kind.
Not one text adds information the listing doesn't already carry. Compare it against the rest of the field in our conversion kit comparison table.
Three wheel sizes, one box
The title claims this one kit fits 12, 16, 18, 20, 24, 26, 700c and 28 inch wheels, and it calls them Bicycle Racks, which reads like translation drift.
A hub motor wheel fits one fork. The axle spacing, the brake mount and the brake reach of a 12 inch bike are not the axle spacing of a 28 inch bike, and a 700c rim alone measures 622mm across, nowhere near a 24 inch wheel's diameter. No single front wheel can be all of these.
The parts list names what actually ships: one 24 inch front wheel with brushless hub motor. The spec table then disagrees with the parts list too, printing a Wheel Size row of 20.47 inches, which is a 20 inch class wheel.
So the listing's three wheel answers, eight sizes, one 24 inch wheel, one 20.47 inch row, don't agree with each other, and the honest way to buy this kit is to ignore the title entirely.
Measure your fork's dropout spacing and your rim's diameter, and order only if one of the two concrete numbers matches your bike. Front-hub placement carries its own warnings whatever the size: the motorized wheel is the steering wheel, and Wikipedia's wheel hub motor article notes that in-wheel motors, unsupported by shock absorbers, are less shielded from shocks and debris, which shortens their working life.
What 390rpm means for the 26.72mph claim
The motor's rated speed is 390rpm, and the wheel it turns decides what that means. On the spec row's smaller wheel, which rolls about 1.6m per turn, 390rpm works out to roughly 38 km/h or 24mph with no load.
On the parts list's 24 inch wheel, about 1.9m per turn, the same speed reaches about 45 km/h or 28mph. The claimed top speed of 26.72mph sits between those two answers and matches neither wheel the listing itself names, so the claim is loose arithmetic even at no-load. With a rider aboard, expect less.
The electrical numbers are cleaner. 750W at 36V draws about 21 amps continuous, which is ordinary for a kit this size, and it puts the motor exactly at the 750W continuous cap most US states apply to e-bike classes 1 through 3.
The remaining bullet numbers are claims the record never tests: efficiency above 82 percent, torque of 35N.m, climbing up 12 degree slopes, and a load rating of 220.46 pounds. One more tell about the copy's care: the last two bullets are printed twice, word for word, back to back.
Throttle-only, and the parts list agrees
One bullet says it plainly: you only need to control the speed through the thumb throttle.
The parts list backs that up and closes the case. It names a motor wheel, an electric controller, two hand brakes, two handle grips, two junction boxes, a spoke key, a controller bag, and a thumb throttle. There is no pedal-assist sensor in that list, no battery, no charger, and no manual either.
That matters beyond convenience. A thumb-throttle-only bike and a pedal-assist bike are treated differently under some US state class rules, so a kit that ships throttle-only can put your build in a different legal box than the wattage alone suggests.
The spec table adds a detail the parts list contradicts: it lists Headlight as a special feature, twice, and no headlight appears in the box. There is also no warranty row anywhere in the table, which at this price band is worth weighing against kits that commit to one in writing.
Toothed or toothless: the motor cannot be both
The title calls the motor brushless and toothless, which is the language for a gearless direct-drive hub. Bullet 2 calls it a brushless toothed small high-speed series wheel hub motor, which is the language for a geared hub with an internal reduction.
The two designs behave differently and the difference reaches your ride. Direct-drive hubs are heavier for the same power, very quiet, and they drag slightly when you pedal with the power off. Geared hubs are lighter, freewheel without drag, and use the gear reduction to turn torque up.
A listing that calls the same motor both things hasn't told you which you're buying, so the weight expectation, the pedaling drag, and even the accuracy of the 390rpm figure all stay open until the box arrives.
The record won't settle it either, because the two texts are copy-shaped and neither describes the motor running. On a listing this loose, the motor identity is one more thing to confirm from the label on the hub itself when the kit lands.
FAQ: the battery the parts list never names, the cap the motor meets exactly and the rating a promotion could explain
Which wheel sizes does this kit fit?
The title claims eight sizes, the parts list ships one 24 inch front wheel, and the spec table's Wheel Size row reads 20.47 inches. Trust the parts list over the title, measure your fork's dropout spacing and rim diameter, and order only if the concrete numbers match your bike.
Does it include a battery or a charger?
No. The parts list names neither, and the listing never says what battery the kit expects. Budget for both separately.
Is it street legal?
The 750W motor sits exactly at the continuous wattage cap most US states apply to e-bike classes 1 through 3, but this kit is throttle-only as listed, and throttle operation changes the class in some states. Check your local rules before you build.
How fast does it go?
The listing claims 26.72mph. The arithmetic on the two wheels the listing itself names puts the no-load speed at about 24 to 28mph, and the riding speed lands below that with a rider aboard.
Can you trust the 5.0 rating?
Treat it as thin. Three ratings, two texts, neither from a confirmed purchase, both restating the listing's bullets, and one text sharing its exact date with four unverified texts on the brand's 1000W listing. If it isn't the right fit, the conversion kit comparison table sorts every option we track.