Hiboy S2 MAX vs NIU KQi 300X: Which Should You Buy? (2026)
The Hiboy S2 MAX and the NIU KQi 300X land close enough on price and class to be genuine cross-shops — $490 against $699, and both sit in the commuter class. Every figure below is the manufacturer's published claim or a value we compute from it; where a maker leaves a spec unpublished we show a dash rather than guess, and a blank is never counted against a scooter. One habit to carry into any range comparison is to halve the claim. The S2 MAX claims 40 miles but realistically returns about 22–28; the KQi 300X's 37.3-mile claim works out to roughly 21–26. The sections that follow work through where each one leads, and the verdict above already names the pick for most buyers — the detail below is there to overturn it if your priorities differ.
Side by side
| Motor & speed | ||
| Top speed (claimed) | 19 mph | 23.6 mph✓ |
| Peak power | 650 W | 1000 W✓ |
| Nominal power | 500 W | 500 W |
| Drive | Single motor | Single motor |
| Max incline | 36.4%✓ | 25% |
| Battery & range | ||
| Claimed range | 40 mi✓ | 37.3 mi |
| Est. real-world range | 22–28 mi✓ | 21–26 mi |
| Battery | 557 Wh | 608 Wh✓ |
| Charge time | 6.5 h | 6 h✓ |
| Build | ||
| Weight | 40 lb✓ | 48.7 lb |
| Max load | 220 lb | 265 lb✓ |
| Suspension | — | dual |
| Brakes | — | Dual disc front & rear + regenerative |
| Water resistance | IPX4 | IP55 |
| Tyres | 10" tubeless | 10.5" tubeless |
| Features | ||
| Score (within category) | 62/100 | 66/100✓ |
| Price | $490✓ | $699 |
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 does not publish suspension and brake hardware for the Hiboy S2 MAX — 2 of the 15 specifications we track. NIU publishes every specification we track for the NIU KQi 300X. 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 If one of the unpublished figures is the one your decision turns on, ask the seller in writing before you buy: a maker that measures a specification usually states it, and silence is a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
The NIU KQi 300X is the faster of the pair, 23.6 mph against 19 mph — a 4.6 mph gap that shows on open stretches but rarely in traffic, where junctions and shared paths set the pace regardless of what the scooter can do. The NIU KQi 300X 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. The Hiboy S2 MAX also claims the steeper hill-climbing grade, worth noting if your commute has a real gradient rather than a gentle rise. 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 MAX holds 557 Wh and the KQi 300X 608 Wh. The NIU KQi 300X's 9% 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 MAX's 40-mile figure realistically works out to about 22–28 miles once you account for a normal rider at real speeds; the KQi 300X's 37.3 lands at roughly 21–26. 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. 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: 40 lb against 48.7 lb, a 8.7 lb difference. If you carry the scooter up stairs or onto a train, the lighter Hiboy S2 MAX 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. Only the NIU KQi 300X has suspension at both ends, the single upgrade that most changes how a scooter feels on cracked city pavement; the other leans on its tyres to take the edge off, which works but not as well. Each publishes a water-resistance rating (IPX4 and IP55); the higher of the two shrugs off heavier rain, though neither should be ridden through standing water or pressure-washed.
Price, score & value
The Hiboy S2 MAX is the cheaper of the two, $490 against $699 — a $209 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 NIU KQi 300X scores higher (66/100 to 62/100). 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 $209 buys
The NIU KQi 300X costs $209 more. That buys:
- peak power: 1000 W vs 650 W
- suspension: dual vs none
- water resistance: IP55 vs IPX4
- top speed: 23.6 mph vs 19 mph
- max load: 265 lb vs 220 lb
- battery capacity: 608 Wh vs 557 Wh
- charge time: 6.5 h vs 6 h
- tyre diameter: 10.5" vs 10"
- max incline: 36.4% vs 25%
- weight: 48.7 lb vs 40 lb
- claimed range: 40 mi vs 37.3 mi
It does not buy:
- nominal power (both 500 W)
- voltage (both 48 V)
- tyre type (both tubeless)
- drive (both Single motor)
These two share more than they differ on. 4 published specifications are identical across both: nominal power (500 W), voltage (48 V), tyre type (tubeless), drive (Single motor). That matters more than it first appears, because it narrows the decision to a short list: the 12 measures where they actually diverge — peak power, max incline, price and others — carry the whole choice. Anything on the identical list can be set aside: it will be the same experience whichever you buy, so it should not sway you either way.
Where the S2 MAX wins
The Hiboy S2 MAX claims a steeper grade (36.4% vs 25%), costs less ($490 vs $699), is lighter to carry (40 lb vs 48.7 lb), and claims more range (40 mi vs 37.3 mi). That is a meaningful spread of advantages, not a single headline number.
Where the KQi 300X wins
The NIU KQi 300X peaks higher (1000 W vs 650 W), has more suspension (dual vs none), is better sealed against water (IP55 vs IPX4), is faster (23.6 mph vs 19 mph), takes a heavier load (265 lb vs 220 lb), carries the bigger battery (608 Wh vs 557 Wh), recharges faster (6 h vs 6.5 h), and runs a larger tyre (10.5" vs 10"). Together those make it the stronger sheet in several areas.
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.
- peak power
- Peak power is a short-burst figure — it describes acceleration headroom rather than what a motor can hold on a sustained climb.
- max incline
- A climbing grade is quoted under test conditions; a heavier rider reaches the limit sooner than the published figure suggests.
- 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.
- water resistance
- An IP rating describes water resistance, not immersion — it covers rain and splashes, never standing water or a pressure washer.
- Tyre type (both tubeless)identical on both
- Pneumatic and tubeless tyres absorb road imperfections that solid tyres pass into the deck; solid tyres trade that comfort for never puncturing. A shared construction means the same trade on both.
- 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
Prices are snapshots from our tracker and can change. We may earn a commission on purchases made through these links — this never affects rankings.
Prices are snapshots from our tracker and can change. We may earn a commission on purchases made through these links — this never affects rankings.
Who should buy which
Buy the Hiboy S2 MAX if your route has a real gradient (36.4% vs 25% claimed grade), or you want to spend less ($490 vs $699). Buy the NIU KQi 300X if you want more peak output (1000 W vs 650 W — a decisive 35% edge), or your roads are rough (dual suspension vs none). Whichever you pick, 4 specifications are identical across both — nominal power, voltage, tyre type — so those rows cannot decide it. Within their category our score puts the NIU KQi 300X at 66/100 against 62/100.
Bottom line: the NIU KQi 300X is the safer default here — it peaks higher (1000 W vs 650 W). The Hiboy S2 MAX earns its place if a steeper grade (36.4% vs 25%) 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
Is the Hiboy S2 MAX or the NIU KQi 300X better overall?
Within their category, the NIU KQi 300X scores 66/100 and the Hiboy S2 MAX scores 62/100. Our scores compare models within their own category, and the two are close enough here that your priorities — carry weight, range, price — should decide it rather than the raw number.
Which one has better real-world range?
Estimated at 55–70% of the claim, the S2 MAX works out to about 22–28 miles and the KQi 300X to about 21–26. The one with the larger battery (557 Wh vs 608 Wh) holds its distance better under load.
Which is cheaper to buy?
The Hiboy S2 MAX is the cheaper of the two at $490 against $699. Prices are tracked snapshots and can change — check the current figure on each model's page before buying.
Which is easier to carry and store?
The Hiboy S2 MAX is lighter at 40 lb versus 48.7 lb, so it is the better pick if you carry a scooter up stairs or onto transit. Both fold for storage; weight is the deciding factor here, not folded size.
Can I ride either one in the rain?
Both publish a water rating — S2 MAX is IPX4 and KQi 300X is IP55. Higher ratings (IPX6, IP66) handle sustained rain; IPX4–IPX5 covers light rain and splashes but not a downpour. Neither should be submerged or pressure-washed.
Full specifications and sources: Hiboy S2 MAX · NIU KQi 300X