NIU KQi 300X vs NAVEE ST3 Pro

The short answer

These two scooters get compared constantly and for good reason: they sit in the same weight class, the same speed class and within two miles of each other on measured range. Both have been ridden to shutdown by the same independent tester on the same protocol, which makes this one of the few genuinely like-for-like comparisons available in this category (eRideHero, Sep 2026).

There is no winner on the numbers. There is a winner for you, and it depends on one question: do you carry it, or does it live outside?

• You carry it up stairs, onto a train, into an office. KQi 300X. The 6.3 lb difference is the whole argument, and the dual discs are the better brake package.
• It lives in a shed, a garage or a bike rack and your route climbs. ST3 Pro. 600 W clears the threshold where 8-10% grades stop being a struggle, and the IPX5 rating means road spray is a non-event.

We have included the NAVEE GT3 Pro as a third row because it is the option neither shortlist mentions: 23.3 measured miles and the same IPX5 rating for less money, at the cost of 48.5 lb and a 400 W motor (eRideHero, Sep 2026).

One note on the order below. The three rows are listed by which we would recommend to the most common reader, not by the site’s published scoring rubric — on the rubric these two score within a tenth of each other (5.2 against 5.3), which is the statistical way of saying the same thing this page says in words: there is no winner on the numbers, only a winner for your journey. Each card shows its score so you can check that for yourself.

Side by side

Range: a 1.9-mile difference

26.8 miles against 24.9 miles, both measured. In practical terms that is nothing — colder weather, a headwind or a hill will swallow 1.9 miles on either scooter before the hardware difference shows up.

What is worth noticing is that both figures are unusually good for the weight class. The twelve-model study behind this site’s range page found an average of 71% of advertised range delivered (Rider Guide, Sep 2026); a measured mid-20s figure from a sub-55 lb commuter is the sort of number that would be advertised as 40 miles elsewhere.

Plan either scooter around a round trip of about 20 miles in good conditions and about 15 in winter, and neither will surprise you. If your round trip is longer than that, both are the wrong scooter and the 40-plus-mile round-up is the right page.

Brakes: dual disc or drum-and-disc

The KQi 300X runs dual discs, front and rear. The ST3 Pro runs a front drum with a rear disc (eRideHero, Sep 2026). Both are two real friction brakes, which already puts them ahead of the large part of the market that pairs one disc with a regenerative brake and calls it dual braking.

The difference is character rather than quality. A disc has better feel and better outright bite; it is also exposed, so water, grit and road salt reach the friction surface directly. A drum is enclosed, which makes it duller in the dry and noticeably more consistent in the wet, and it needs adjusting far less often. Our brakes guide ranks the hardware in order.

If you ride year-round in a wet climate, the drum is a feature and not a compromise. If you ride mostly dry and want the shortest stop, take the discs.

Weight: the 6.3 lb that decides it

48.7 lb against 55 lb. Both are too heavy to carry comfortably; only one is light enough to carry at all.

The threshold most riders discover the hard way sits somewhere around 50 lb. Below it, a flight of stairs is unpleasant but routine. Above it, a flight of stairs becomes the reason the scooter stays where it is, which quietly changes what the scooter is for. 55 lb is a machine you roll to a bike rack; 48.7 lb is a machine you can take inside and charge at your desk.

The detail is in weight and fold size, and if carrying is the dominant constraint then neither of these is the right answer — a lightweight folding scooter at under 30 lb is a different category of convenience.

Power and weather

600 W against 500 W sounds marginal and is not, because the useful comparison is against your body weight plus the scooter’s. 500 W is around the threshold where a typical adult stops losing speed on an 8-10% grade; 600 W gives headroom above it. If your commute has one hill you think about before you leave, the ST3 Pro is the scooter — watts and torque explains why the figure behaves the way it does.

On weather, the ST3 Pro publishes IPX5 and the KQi 300X publishes nothing in the test data we found. That is not evidence the NIU is poorly sealed — most scooters publish no rating at all — but a stated IPX5 is a specific, falsifiable claim, and road spray at commuting speed behaves like exactly the low-pressure jet IPX5 covers. The ladder is in our IP ratings guide, and the full rain-focused shortlist is on the waterproof round-up.

Both run self-healing tubeless tires — 10.5 inches on the NIU, 10 inches on the NAVEE (eRideHero, Sep 2026) — which is the right side of the tire argument and the reason neither appears on our solid-tire page as a cautionary example.

The verdict

NIU KQi 300X for the rider who carries the scooter, rides mostly on the flat and wants the stronger brakes and the longer measured range. It is the better all-rounder, and it is the one we would buy without a specific reason not to.

NAVEE ST3 Pro for the rider with a hill, a wet winter and somewhere to park. The 600 W motor and the drum brake are both answers to problems the NIU does not solve, and 55 lb stops mattering the moment you are not lifting it.

NAVEE GT3 Pro if the budget is the constraint. You give up 3.5 measured miles and 200 W against the ST3 Pro, and you keep the IPX5 rating.

Both main models have payload ratings of 265 lb, which is the category’s standard ceiling and the one spec on which neither scooter helps a heavier rider. If that number is close to yours, start at scooters for heavy adults instead.