E-Bike Speed &
Power Limits UK.

The power limit: 250 watts

To be a legal EAPC, the motor's maximum continuous rated power must not exceed 250 watts.

The key phrase is continuous rated. This is the power the motor is designed to sustain over time — not a momentary "peak" figure that marketing sometimes quotes. A motor might briefly draw more during a hill climb, but its rated continuous output is what the law measures, and that must be 250W or under.

This is why you should be wary of imported bikes advertised as "500W" or "1000W". Those figures put the bike outside EAPC limits, making it a moped or motorcycle that needs registration, tax, insurance and a licence. See illegal e-bikes and penalties for what that means in practice.

The speed limit: 15.5 mph

The motor must cut out — stop adding power — once the bike reaches 15.5 mph (25 km/h).

A common misunderstanding: this is not a top speed for the bike. It's the speed beyond which the motor stops helping. If you've got the legs for it, you can pedal an EAPC well past 15.5 mph on the flat or downhill, just as you could on a normal road bike.

• 0 to 15.5 mph: the motor assists as you pedal.
• At 15.5 mph: the motor smoothly stops assisting.
• Above 15.5 mph: you're riding on muscle power alone.

The Eskuta SX-250 is governed to exactly this 15.5 mph cut-off.

Why these limits exist

The 250W and 15.5 mph thresholds come from assimilated EU type-approval rules and are designed to keep pedal-assist bikes firmly in the bicycle category — fast enough to be useful, slow enough to share space safely with pedestrians and other cyclists.

How the limits are enforced

Police can and do check e-bikes, particularly during crackdowns on illegal high-powered machines and food-delivery riders. Enforcement focuses on:

• Rated motor power (is it really 250W?)
• Whether the motor drives the bike past 15.5 mph
• Whether a speed limiter has been removed or derestricted

Tampering with a bike to lift the speed cut-off is one of the fastest ways to turn a legal EAPC into an illegal vehicle — and it can void your insurance and warranty too.

What about the 2024 proposal to raise the limit to 500W?

The government consulted on raising the power limit to 500W in 2024 but dropped the idea in 2025. The 250W limit still stands for 2026. Full story in UK e-bike law changes 2026.

← Back to the complete guide to UK e-bike laws

Informational only, not legal advice. Verify the current rules on GOV.UK before riding.