# How fast does an e-bike go in the UK? Source: https://pedalandvolt.co.uk/blog/how-fast-does-an-ebike-go Published: 2026-10-12 Publisher: Pedal and Volt **In short:** A UK-legal e-bike gives motor assistance up to 15.5 mph (25 km/h), then the motor stops helping. You can pedal faster under your own power, for example downhill, and the bike remains legal. Many riders cruise at around 12 to 15.5 mph. Bikes that assist beyond 15.5 mph, or have more than 250 W rated power, are treated as mopeds or motorcycles and need registration, insurance and a licence. Speed is one of the most common questions about e-bikes, partly because online listings advertise models that reach 28, 40 or even 50 mph. In Great Britain, the speed that matters is the speed at which the motor stops assisting. This explainer covers the legal limit, how fast e-bikes feel in everyday riding, what happens above the limit and why faster bikes sold online cannot be ridden on roads without the paperwork a motorbike needs. ## The legal assist limit Under the Electrically Assisted Pedal Cycles Regulations, an e-bike in Great Britain must stop providing assistance when it reaches 15.5 mph, which is 25 km/h. The motor must have a maximum continuous rated power of 250 W and must only assist while you pedal, apart from a walk-assist mode up to 6 km/h. The [gov.uk electric bike rules](https://www.gov.uk/electric-bike-rules) summarise these points. The limit applies to the motor, not to the bike. If you pedal harder or ride downhill, you can go faster than 15.5 mph without breaking the EAPC rules, as long as you follow the normal rules of the road and any speed limits that apply. Northern Ireland has its own rules; check nidirect if you live there. ## Typical riding speeds These are rough figures. The real benefit of an e-bike is keeping a steady speed up hills and into headwinds, which makes average journey speeds higher even though the top assisted speed is modest. Riders who stop and start a lot in town often find that an e-bike shortens their journey more through faster getaways from junctions than through a higher top speed. | Situation | Typical speed | | --- | --- | | Town riding with junctions | About 10 to 14 mph | | Cycle path or quiet road, mid assist | About 13 to 15.5 mph | | Climbing a moderate hill in high assist | About 8 to 13 mph | | Above the assist limit, on your own power | Depends on fitness, bike weight and tyres | | Walk assist | Up to about 3.7 mph | Rough everyday speeds ## What happens above 15.5 mph As you approach the limit, assist fades and then stops. On a heavy bike you will feel the extra weight and rolling resistance once you are pedalling unaided, so most riders settle just below the limit. Lighter e-bikes with narrow tyres are easier to ride above it. If your bike stops assisting well below 15.5 mph, the wheel size setting may be wrong or a sensor may be misreading. Our [assist levels explainer](https://pedalandvolt.co.uk/blog/ebike-assist-levels-explained) covers display settings, and our [motor cutting out guide](https://pedalandvolt.co.uk/blog/ebike-motor-cutting-out) covers other causes. ## Faster e-bikes and the law Listings for 750 W, 1000 W or 2000 W bikes that reach 28 mph or more describe vehicles that are not EAPCs. In law they are motor vehicles. To use one on a public road, it would need type approval, registration and tax, and the rider would need a suitable licence, insurance and a motorcycle helmet. In practice most cannot be registered, so they are only usable on private land with permission. See [off-road only e-bikes explained](https://pedalandvolt.co.uk/blog/off-road-only-ebikes-explained). The same applies to a legal e-bike that has been derestricted with a dongle or changed settings. Police can seize vehicles used without insurance. Use the [UK e-bike law check](https://pedalandvolt.co.uk/tools/uk-ebike-law-check) to see how a bike's power and assist speed compare with the rules. This is general information, not legal advice. Note: Higher speeds mean longer stopping distances. Ride at a speed that suits the conditions, especially on shared paths with walkers. [Check a bike against EAPC rules](https://pedalandvolt.co.uk/tools/uk-ebike-law-check) ## Getting the most from legal speed For longer commutes, range matters as much as speed. Our [long range e-bike guide](https://pedalandvolt.co.uk/best/best-long-range-electric-bikes) compares battery sizes. - Choose a lighter bike with narrower tyres if you want to ride above the assist limit easily; see our [electric hybrid guide](https://pedalandvolt.co.uk/best/best-electric-hybrid-bikes). - Keep tyres at the right pressure to reduce rolling resistance. - Use the gears to keep a comfortable cadence near the limit. - Pick a torque sensor bike for a smoother, more natural feel at speed. ## Frequently asked questions **What is the top speed of an e-bike in the UK?** The motor assists up to 15.5 mph. You can go faster on your own power. **Is it illegal to ride an e-bike at 20 mph?** Not if you are pedalling unaided above 15.5 mph on a legal EAPC and following road rules. **Can I make my e-bike faster?** Derestricting it for road use makes it a motor vehicle in law, needing registration, insurance and a licence. **How fast is 25 km/h in mph?** About 15.5 mph. To convert, divide km/h by about 1.609, so 25 km/h works out at just over 15.5 mph. ## Buying guides on this topic - https://pedalandvolt.co.uk/best/best-electric-hybrid-bikes - https://pedalandvolt.co.uk/best/best-long-range-electric-bikes - https://pedalandvolt.co.uk/best/best-electric-bikes-under-1000 ## Sources - [GOV.UK: Riding an electric bike](https://www.gov.uk/electric-bike-rules)