Every time I ride a Forest bike up a hill in London, there’s a moment where the motor just stops helping and it suddenly feels like I’m pedalling a tank. That’s not the bike breaking, it’s the law. The e-bike speed limit UK riders deal with is 15.5 mph, and once you hit it, the motor has to stop. In this guide I’ll explain the e-bike speed limit in the UK, the power rules, and how to tell whether an e-bike is actually road legal, with a focus on the hire bikes we ride around London.
What Is the E-Bike Speed Limit in the UK?
In the UK, the motor on a legal e-bike must stop helping you once you reach 15.5 mph (25 km/h). That’s the e-bike speed limit in UK law, and it applies to the motor, not to you. You can pedal faster than 15.5 mph if your legs are up to it, the bike just won’t give you any extra help.
The official name for a legal e-bike is an electrically assisted pedal cycle, or EAPC. If an e-bike meets the EAPC rules, it’s treated just like a normal bicycle. You don’t need a licence, insurance or road tax, and you can ride it on roads and in cycle lanes.
The Rules a Legal E-Bike Has to Meet
According to the government’s electric bike rules, a legal e-bike in England, Scotland and Wales must:
- Have pedals that can be used to move it.
- Have a motor with a continuous rated power of no more than 250 watts.
- Stop the motor from helping once the bike is going faster than 15.5 mph.
You also need to be 14 or over to ride one. Most e-bikes only help while you’re pedalling, but the rules allow a walk assist mode, where the motor can move the bike without pedalling at up to about 3.7 mph (6 km/h). That’s handy for pushing a heavy bike up a ramp, not for riding.
Why Lime, Forest and Voi Bikes Stop Helping at 15.5 mph
Every hire e-bike in London, from Lime, Forest, Voi and Bolt to the Santander Cycles e-bikes, is built to these rules. That’s why they feel brilliant pulling away from traffic lights and then flat once you’re cruising along at 15 mph or so.
Hire bikes are also heavy. They’re built to survive being ridden by thousands of people and left outside in the rain, so they weigh a lot more than a normal bike. Once the motor cuts out, you’re pushing all that weight yourself, which is why very few people go much faster than the e-bike speed limit on a hire bike. If you’re comparing operators, my e-bike hire London guide has every price side by side.
Is There a Speed Limit for E-Bikes on UK Roads?
The 15.5 mph rule is about the motor, not how fast you’re allowed to travel. Road speed limits are written for motor vehicles, and a legal e-bike counts as a bicycle. That said, you can still be prosecuted for careless or dangerous cycling, so riding flat out downhill through a busy junction is a bad idea whatever the law says about speed.
What about speed pedelecs?
Speed pedelecs are e-bikes that help you up to around 28 mph (45 km/h). They’re popular in the Netherlands, but they aren’t legal e-bikes in the UK. The Dutch NTA 8776 helmet standard was created for these faster e-bikes, which I explain in my guide to whether you need an NTA 8776 helmet for an e-bike.
Is the UK E-Bike Speed Limit Changing?
Not at the moment. In 2024 the government consulted on raising the power limit to 500 watts and allowing throttles that work up to 15.5 mph without pedalling. In January 2025 it decided not to go ahead with either change, after most major organisations opposed them. So the 250 watt limit, the 15.5 mph cut-off and the walk assist rule all stay as they are. You’ll still see plenty of websites talking about new e-bike laws, but as things stand, the rules haven’t changed.
E-Bike Speed Limit UK: Quick Answers
What is the maximum speed of an electric bike in the UK?
The motor can help you up to 15.5 mph (25 km/h). You can go faster under your own pedal power.
Is an electric bicycle legal in the UK?
Yes, as long as it has working pedals, a motor of no more than 250 watts, and the motor stops helping at 15.5 mph. You need to be 14 or over to ride one.
Do I need a licence or insurance for an e-bike?
Not for a legal e-bike.
Are throttle e-bikes legal in the UK?
Only if the throttle stops helping at 3.73 mph (6 km/h), which is walking pace, like a walk assist button. That’s the limit for throttles without type approval, according to the government’s own consultation outcome. If it can be ridden on a throttle faster than that without pedalling, it simply isn’t a legal e-bike in the UK (see GOV.UK’s e-bike rules). The government looked at allowing throttles up to 15.5 mph, but on 28 January 2025 it decided not to go ahead.
How fast can an e-bike go?
The motor on a legal e-bike can help you up to 15.5 mph (25 km/h). You can go faster than that under your own pedal power, but the motor stops helping. Any e-bike that helps you past 15.5 mph isn’t road legal as a bicycle.
Do I need a helmet on an e-bike?
It’s not a legal requirement on a legal e-bike, but I’d always wear one. My guides to the best e-bike helmets and the best folding bike helmets are a good place to start, especially if you ride hire bikes and need something you can carry.
