Hiboy S2 vs NIU KQi3 Sport: Which Should You Buy? (2026)

Side by side

	Hiboy S2 48	NIU KQi3 Sport 33
Motor & speed
Top speed (claimed)	19 mph✓	17.4 mph
Peak power	500 W	600 W✓
Nominal power	350 W✓	300 W
Drive	Single motor	Single motor
Max incline	15%	15%
Battery & range
Claimed range	17 mi	24.9 mi✓
Est. real-world range	9–12 mi	14–17 mi✓
Battery	270 Wh	365 Wh✓
Charge time	4 h✓	5 h
Build
Weight	35.49 lb✓	40.6 lb
Max load	220 lb	265 lb✓
Suspension	rear	none
Brakes	E-braking & Disc braking	Disc front + regenerative
Water resistance	IPX4	IP54
Tyres	8.5" solid	9.5" pneumatic
Features
Score (within category)	48/100✓	33/100
Price	$300✓	$419

A green ✓ marks the better figure on that row. “—” means the manufacturer does not publish it; a blank is never counted as a loss. Scores compare each model within its own category.

What the makers don't publish

Hiboy publishes every specification we track for the Hiboy S2. NIU does not publish system voltage for the NIU KQi3 Sport — 1 of the 15 specifications we track. We show a dash for each of those rather than estimate, and a missing figure is never counted against a scooter in our scoring — the component is dropped and the remaining weights renormalise. Those rows cannot be compared head to head, so treat this as a comparison of what is published rather than a complete picture. If one of the unpublished figures is the one your decision turns on, ask the seller in writing before you buy: a maker that measures a specification usually states it, and silence is a reasonable prompt to look harder.

Motor & speed

On top speed the two are effectively level — 19 mph plays 17.4 mph — so speed alone will not decide this, and you should weigh the other rows more heavily. The NIU KQi3 Sport carries more motor on paper, and that surplus shows up in acceleration and on climbs rather than in a higher cruising speed — the place a stronger motor actually earns its keep is the hill you take twice a day. Read any top-speed figure as a maximum reached under ideal conditions; rider weight and gradient both pull it down in the real world, so treat these numbers as a ceiling rather than a cruising promise.

Battery & range

Battery capacity is the honest way to compare range, because watt-hours cannot be marketed around: the S2 holds 270 Wh and the KQi3 Sport 365 Wh. The NIU KQi3 Sport's 35% larger pack will out-last the other on the same route whatever the two brochures claim, and it is the single number to trust most in this section. Both claims deserve the usual discount. The S2's 17-mile figure realistically works out to about 9–12 miles once you account for a normal rider at real speeds; the KQi3 Sport's 24.9 lands at roughly 14–17. Plan around the lower end of whichever band matters to you: if your daily round trip does not fit inside it with margin to spare, the range difference here is the deciding factor and you should pick the bigger battery. Recharging also differs: the Hiboy S2 is back to full in about 4 hours against 5, which matters if you top up between a morning and evening commute rather than overnight. Whichever you choose, remember that both figures assume a fresh battery; a pack loses roughly 20–30% of its capacity after a couple of years of daily cycling, so a used example of either will fall short of these numbers.

Build & ride

Weight is where the daily reality lives: 35.5 lb against 40.6 lb, a 5.1 lb difference. If you carry the scooter up stairs or onto a train, the lighter Hiboy S2 is the one you will actually keep using — the difference between a scooter that gets ridden and one that gathers dust is often a single flight of steps. Each publishes a water-resistance rating (IPX4 and IP54); the higher of the two shrugs off heavier rain, though neither should be ridden through standing water or pressure-washed. Tyres differ too: S2 runs solid and KQi3 Sport pneumatic. Pneumatic and tubeless tyres absorb more of the road than solid ones, at the cost of the occasional puncture; solid tyres never flat but pass more buzz into your hands and feet.

Price, score & value

The Hiboy S2 is the cheaper of the two, $300 against $419 — a $119 gap. Whether that gap is worth closing depends entirely on whether the pricier scooter's advantages above line up with your priorities. Within their category the Hiboy S2 scores higher (48/100 to 33/100). Remember that our scores are within-category judgements — this comparison is only meaningful because both sit in the same or an adjacent class. If value per dollar is your lens, use the cost-of-ownership calculator on this site: a slightly cheaper scooter with pneumatic tyres can cost more to run over a few years than a pricier one on solid tyres, and the sticker price alone hides that.

What the extra $119 buys

What these numbers actually govern

Here is what each of these measures controls in general — both the ones that separate these two and the ones they share. These describe the measure, not a claim about how either scooter rides, which we have not tested.

claimed range

Every claimed range figure is measured at a light rider weight, a low constant speed and on flat ground, which is why we show a computed real-world band beside it.

price

Price is the one figure that is not a specification — it moves with stock and promotions, so treat any gap as current rather than permanent.

suspension

Suspension at both ends changes how a scooter handles broken pavement more than any other single component; a single unit covers one end only, and none leaves the tyres to do the work.

battery capacity

Watt-hours are the single best predictor of range, because capacity is the one range input that cannot be marketed around.

charge time

Charge time matters most if you top up between a morning and an evening commute rather than overnight.

Max incline (both 15%)identical on both

A climbing grade is quoted under test conditions and a heavier rider reaches the limit sooner than the figure suggests; an identical claim means neither is specified to climb better.

Drive (both Single motor)identical on both

A second motor adds traction and acceleration at the cost of weight and battery drain. Where both use the same arrangement, drive layout is not a separator.

Price & where to buy

Who should buy which

Buy the Hiboy S2 if you want to spend less ($300 vs $419), or your roads are rough (rear suspension vs none). Buy the NIU KQi3 Sport if your trips are longer and range decides it (24.9 mi vs 17 mi claimed — a decisive 32% edge), or you want the bigger battery (365 Wh vs 270 Wh — a clear 26% edge). Whichever you pick, 2 specifications are identical across both — max incline, drive — so those rows cannot decide it. Within their category our score puts the Hiboy S2 at 48/100 against 33/100.

Bottom line: the Hiboy S2 is the safer default here — it costs less ($300 vs $419). The NIU KQi3 Sport earns its place if more range (24.9 mi vs 17 mi) matters more to you. Every figure here is the manufacturer's published claim or a value we compute from it, linked back to each maker's own specification so you can check it yourself.

Frequently asked questions