250W Rear Hub Motor E-Bike Conversion Kit MTX

The 250W conversion kit turns an ordinary bicycle — MTB, city or trekking — into a discreet e-bike with smooth pedal assistance. It is a 250W kit with speed limited to 25 km/h, with a twist throttle and PAS sensor in the box. The brushless gearless direct-drive motor has no gears to wear out and no brushes to replace: force is transmitted magnetically, straight from the stator into the rim. The result is a motor that is practically silent, with a very long service life and almost zero maintenance.

250W technical specifications

A double-wall rim, chosen for the motor's torque

The MTX rim has a double alloy wall precisely to take the torque transmitted by the hub motor — an ordinary single-wall rim can deform over time under this kind of load. For the same reason the kit also includes two torque arms: they clamp to the frame and take the torque off the axle so it is not carried by the dropouts alone.

A dual-mode controller, for when a sensor fails

The controller normally works with the motor's Hall sensors, for smooth starts and a precise throttle response. If a sensor fails it switches automatically to non-Hall mode and the motor keeps running, so you are not left stranded. The brake levers cut power to the motor instantly at the first touch.

What the 250W kit does best

Choosing the battery

The kit ships without a battery. When ordering you can add one of the batteries below, chosen for this kit, all with a key lock and charger included. You can see more in the e-bike batteries category.

Recommended batteries for this kit

250W or 500W? When it is worth going up

250W is enough for flat ground and a total weight (you plus the bike) under 85 kg. If you have regular gradients above 8–10%, carry heavy loads or go over 85 kg, the 500W kit gives you the margin you need. The 500W step gives you 50% more torque (30 N·m against 20 N·m) and speeds of up to 35 km/h.

Warranty and spare parts

The motor carries a 24-month warranty and the electronic components 12 months. Spare parts and accessories are available in the eBike parts section. Compare every power option in the conversion kits category, from 250W up to 3000W.

Frequently asked questions about the 250W kit