ST2 Pro vs K3 vs K3 MASTER: Three Different Rides

The K3, the ST2 Pro and the K3 MASTER share an aluminium frame, a folding stem, suspension at both ends and a low deck. What separates them sits in four places: how many motors drive the wheels, how much weight each is rated to carry, how much each weighs itself, and how far the battery goes.

Specs at a glance

Range figures are the manufacturer’s rated maximums; real range moves with load, terrain, temperature and speed mode.  Gross weight is the packed unit weight from each product page.

The drivetrain: one motor, two motors, two bigger motors

The K3 drives one wheel with a single 1000 W hub. The ST2 Pro drives both, 1000 W each. The K3 MASTER drives both at 1200 W each, for 2400 W combined.

Two driven wheels do not mainly change top speed — that gain is 10 km/h from the K3 to the ST2 Pro, which is the smallest difference in this comparison. They change what happens when the front wheel goes light. On gravel, on a wet manhole cover, on a ramp with a loaded backpack, a single rear motor is doing all the work while the front wheel is doing none. Two driven wheels split that job, and the effect is most obvious exactly where a solo commuter rarely notices it: pulling away on a loose surface, or holding a line on a climb.

The K3 MASTER’s extra 400 W is a different kind of step. It does not just add top speed — it adds torque, which reads as stronger acceleration out of a corner and a climb that feels flatter than it is. If your route is genuinely hilly, that is the difference you feel; on flat tarmac you will rarely call on it.

Mass: the axis that runs the other way

Gross weight per unit runs 29 kg → 36.35 kg → 38.7 kg (the ST2 Pro’s net weight is 33 kg). The order is worth noticing: the most capable scooter is also the heaviest, and the least capable is the only one you would genuinely carry.

In practice, 29 kg is a two-handed lift for most adults, and it is the one that folds down to something you would take onto a train or up a flight of stairs. At 36 kg and 38.7 kg you are not carrying it anywhere — you are wheeling it, and lifting it once at the top of the steps if you must.

So the K3 gives up a motor, 30 kg of load rating and 30 km of range, and takes back 7 to 10 kg of mass. That is the trade the whole range turns on.

Battery and range: two packs, one pack, the biggest pack

• K3 — two packs. The 48 V 15 Ah is rated up to 60 km; the 52 V 20.8 Ah up to 70 km, within a 40–70 km band depending on load and conditions. It is the only one of the three you can size to your actual round trip.
• ST2 Pro — one pack, 52 V 20.8 Ah, rated 50–70 km. The same pack as the K3’s long-range option, so the same territory; what you cannot do is specify the smaller pack.
• K3 MASTER — 52 V 25 Ah, rated up to 100 km. The only one here that clears three digits, and the only one built around a battery that size.

Judge this on your round trip rather than your record. 

Tyres: 10 inches, 10 inches, 11 inches

The K3 and ST2 Pro both roll on 10″ off-road tyres. The K3 MASTER gets 11″.

One inch is not cosmetic on loose ground: a larger wheel rolls over a stone or a root instead of dropping into the far side of it, and it puts more rubber on the ground. For a compacted gravel path on the way home, 10″ is genuinely enough. For a fire road with rocks in it, 11″ is the single strongest functional argument for the flagship.

Features you only get on one of them

K3 — the battery choice and the left-hand control block. Two battery packs is a genuine option the other two do not have. The control cluster is also packaged for one thumb: horn, speed mode, light, power and the unit switch all sit under the left hand, so nothing needs looking down at.

ST2 Pro — the single/dual switch. Double-click the M key and it drops from dual-motor to single-motor. Flat tarmac, one wheel; the moment the surface turns loose, both. Its speed modes are stepped at 6, 10, 15 and 20 km/h against a 60 km/h ceiling, and the spec sheet lists a full lighting set: headlight, tail, turn signals, side lights and atmosphere lighting.

K3 MASTER — the 11″ wheels and the lighting signature. Alongside the bigger tyres it carries KEPOW’s LED deck and stem glow, and a smart digital display with multiple riding modes — the most useful of which, for a 2400 W machine, is the ability to start in a lower mode and work up.

Speed, and the ceiling you actually ride at

50, 60 and 65 km/h. That is ten km/h from the bottom to the middle and five from the middle to the top — the least interesting difference between the three.

It also matters less than the brochure suggests. In several European markets the legal limit for an e-scooter on public roads sits at 20 or 25 km/h, so check your national rules before you ride.

What is identical across all three

Suspension front and rear. Disc brakes at both ends. A colour display. A folding stem and an aluminium frame. A 2-year local warranty backed by KEPOW’s Spain service centre, free shipping, delivery in 3–7 business days in the EU and 7–12 for Norway and Switzerland, 14-day returns, and support replies within 24 hours on weekdays. The K3 and ST2 Pro both run TUYA app control for ride records, battery monitoring, cruise control and one-tap locking.

Which one matches which riding

FAQ

What does the ST2 Pro add over the K3?

A second 1000 W motor, 10 km/h of top speed and a single/dual motor switch, on the same 52 V 20.8 Ah pack — and 7.35 kg of additional weight.

What does the K3 MASTER add over the ST2 Pro?

400 W, 5 km/h, 30 km of rated range and 11″ tyres, at 2.35 kg more. Load rating is identical at 150 kg.

Which one is easiest to carry up stairs?

The K3, at 29 kg gross. 

Which is best for a heavier rider?

The ST2 Pro or the K3 MASTER, both rated 150 kg against 120 kg on the K3. Between those two it comes down to range and tyres, not capacity.

Can the ST2 Pro run on one motor?

Yes — double-click the M key.

Does the K3 MASTER come with a battery choice?

No. It is offered with the 52 V 25 Ah pack only. The K3 is the one with two battery options.

Is the K3 MASTER suitable for a first scooter?

It has multiple riding modes so you can start low and work up, but 2400 W is a lot of machine. A rider new to e-scooters will find the K3 or ST2 Pro easier to learn on.

Do all three have the same warranty and delivery?

Yes: 2-year local warranty backed by KEPOW’s Spain service centre, free shipping, 3–7 business days in the EU and 7–12 for Norway and Switzerland, plus 14-day returns.

The verdict

The K3 is the light one: one motor, 120 kg, 29 kg, and the only one that folds down to something you would carry. The ST2 Pro is the traction-and-load one: two motors, 150 kg, and a switch that gives range back when you do not need both wheels driving.

The K3 MASTER is the distance-and-terrain one: 100 km, 11-inch tyres and 2400 W. It is also the heaviest of the three, which is the honest trade for everything it carries.

The useful way to read the range is not “which is better” but “which of these four numbers describes my riding” — motor count, load rating, mass, and range. 

Related: K3 vs K3 MASTER in depth · What changed on the ST2 Pro · Hills, real range and rough roads explained · Braking and balance on climbs and descents · Electric scooter glossary

Sources

Product pages on kepow.net, specification tables retrieved 28 October 2026: K3 · ST2 Pro · K3 MASTER. Speed-limit context from the ST2 Pro product FAQ and our Switzerland legal guide.