Electric bike motor: hub or crank drive, which to choose?
07/10/2026Electric bike… What is this concept exactly?
07/10/2026
An electric mountain bike (e-MTB) is an excellent way to combine sport, leisure and eco-friendly mobility. To choose the model that suits you best, it is essential to know the different elements influencing the power of these high-tech bikes.
Dans cet article, we will cover the aspects related to the motor, European standards and current legislation on e-bikes.
Power and motor of an e-MTB: what you need to know
The power of an electric mountain bike depends mainly on its motor. The latter is usually located in the rear wheel hub, on the crank or in the front hub (much rarer). Motors are often classified by their wattage (expressed in Watts), which corresponds to the electrical power delivered by the motor.
The different motor powers available
- 250-watt motor: this is the most common power for e-bikes, especially in Europe where it complies with the standards in force. An e-MTB with a 250W motor suits daily, short journeys on fairly gentle terrain.
- 500 to 750-watt motor: these powers are perfectly suited to electric mountain bikes intended for sport and leisure. These models offer more torque (Nm) for better acceleration and let you cross steep climbs or rough terrain easily.
- 1000 watts and more: reserved for high-end models, this power category offers exceptional performance in acceleration, speed and all-terrain ability. However, it is little suited to conventional everyday use. You find this power on some fat bikes.
Note that the higher the motor power, the heavier the e-MTB will be, which can affect your comfort and performance on rides.
European standards and legislation on electric mountain bikes
In Europe, e-bikes are subject to several standards and regulations to ensure user safety and compliance with environmental requirements. Certain rules on electric mountain bike power must therefore be respected.
Maximum permitted power in Europe
Under European legislation, the maximum power permitted for an e-bike is 250 watts. Bikes whose power exceeds this limit are not considered electric bikes, but mopeds or motorcycles.
Consequently, these models are subject to specific standards regarding registration, driving licence and insurance.
Assistance limited
The electric assistance of an e-MTB motor is capped at a maximum speed of 25 km/h. Above that speed, the assistance must switch off automatically.
You will therefore need to pedal without assistance to reach higher speeds. Note that some models, such as speed bikes, can reach 45 km/h!
National regulations
Be aware that each European country may apply specific e-bike regulations. It is therefore important to check the legislation in force in your country of residence or in the countries where you intend to use your e-MTB.
Finding the ideal power for your e-MTB
Now that you have a better understanding of the aspects related to the power of an electric mountain bike, all that is left is to determine which one will best suit your needs and riding style.
Here are a few tips to help you:
- Assess your needs: if you want an e-MTB for daily or occasional journeys on rather flat terrain, a 250-watt motor should be enough. For sportier use or rough terrain, go for 500 to 750W. If you want optimal performance and great versatility, a 1000-watt or more motor will be ideal.
- Think range: keep in mind that motor power also affects the range of your e-MTB. A more powerful motor draws more energy, reducing your battery range.
- Consider the weight of the bike: a more powerful motor generally means a heavier e-bike. It is therefore important to consider the weight of the e-MTB in your choice to ensure a good balance between comfort and performance.
- Check compliance with legislation: do not forget to check the European and national standards in force for e-bikes so as to choose a model compliant with your countryu0027s regulations.
Taking these different elements into account, you will be able to find the ideal power for your electric mountain bike. You will then enjoy a ride suited to your needs and compliant with the standards in force.
