What motor power and battery should you choose for an electric bike? (Guide + EU regulations)

European regulations: a point not to be overlooked

In Europe, for an electric bike to be classified as a standard pedal-assist bicycle (pedelec), it must meet the following requirements:

• motor power limited to 250W (nominal power)
• assistance limited to 25 km/h
• assistance only active when pedalling

If these rules are not met:

• the bike is classified as a moped
• registration may be required
• specific insurance becomes compulsory

In the event of an accident involving a non-compliant bike, the insurer may refuse to cover the claim.

This is a point that is often overlooked, but it is essential to consider when making your choice.

Understanding motor power

Power is expressed in watts (W).
It determines the bike's ability to accelerate and maintain speed, particularly when climbing hills.

What power for which use?

Urban use (daily commuting, flat terrain)
250W is sufficient and compliant with European regulations.

Mixed use (city + trails, gentle hills)
Between 350W and 500W offers more comfort, but may not be compliant depending on use.

Use on inclines or demanding terrain
500W to 750W provides more power, particularly on hills.

Intensive use
Above 750W, performance is high, but these models fall outside the standard legal framework in Europe.

The role of motor torque

Torque, expressed in Nm, is often more important than raw power.

40 to 50 Nm: suited to city use
60 to 80 Nm: versatile use
More than 80 Nm: ideal for hills and challenging terrain

A 250W motor with good torque can be more effective than a more powerful motor that is poorly optimised.

Understanding battery capacity

The battery determines the bike's range.

It is expressed in volts (V) and ampere-hours (Ah), but the most relevant indicator remains watt-hours (Wh).

Formula: Wh = V × Ah

What range can you expect for a given capacity?

Less than 20 km per day
360 to 500 Wh

Between 20 and 50 km per day
500 to 700 Wh

Long distances
700 to 1000 Wh

Intensive use
800 Wh or more recommended

What actually affects range

Range varies depending on several factors:

rider weight
assistance level used
terrain type
weather conditions
tyre pressure

A battery advertised for 80 km may in reality deliver between 40 and 80 km depending on use.

Finding the right balance

Your choice should not be based solely on power or solely on battery capacity.

A good balance is essential:

250W with 400 to 600 Wh for urban use
500W with 600 to 800 Wh for versatile use
750W with 700 Wh or more for intensive use

How market brands are positioned

Brands available on the market such as Engwe, ADO E-Bike, Fiido, Samebike, Shengmilo, Hitway, Tenways, Lankeleisi, GUNAI, Euybike, Urlife, Hidoes, Coswheel, Akez and Randride generally offer:

motors more powerful than the European standard
good battery capacity
a competitive price-to-quality ratio

The presence of warehouses in Europe and the United Kingdom enables faster delivery and more accessible after-sales service.

Mistakes to avoid

Basing your decision solely on wattage
Ignoring European regulations
Overlooking actual battery capacity
Underestimating your daily needs
Choosing a non-compliant model without understanding the implications

Conclusion

Choosing an electric bike means finding the right balance between power, range and real-world use.

But it also means complying with regulations to avoid any problems in the event of an accident.

A well-matched model will be more reliable, more enjoyable to ride and safer in the long run.

Comparison tools allow you to quickly assess these criteria and make an informed choice based on your needs.