What makes an e-bike legal in the UK
An electric bike that follows the rules is treated in law exactly like an ordinary pedal cycle. In the UK the legal category is the Electrically Assisted Pedal Cycle, or EAPC. If your bike fits that definition, you need no licence, no road tax, no insurance and no registration. You can ride it on roads and cycle paths, and there is no compulsory helmet, although one is sensible. These rules apply across England, Scotland and Wales.
A bike qualifies as an EAPC when it meets three things: the motor is rated at no more than 250 watts of continuous power, the assistance cuts off once you reach 15.5mph, and the rider is 14 or older. The bike must also have working pedals that can drive it, and it should be clearly marked with the motor's power rating and the manufacturer's details. Miss any of those and the bike stops being a bicycle in the eyes of the law and becomes a motor vehicle, with all the paperwork that involves.
The 250W and 15.5mph limits
Two numbers do most of the work. The first is 250 watts. That is the motor's maximum continuous rated power, not a hard ceiling on what it can ever produce. A compliant motor is allowed to deliver a short burst above 250W on a steep climb, so long as the rating it is sold and marked at sits at 250W or below. What matters is the rated figure, which is why clear markings matter when you buy.
The second number is 15.5mph, or 25km/h. This is the speed at which the motor must stop helping. You are free to pedal faster than that under your own effort, on a descent or a sprint, and nothing in the law stops you. The motor simply has to bow out at 15.5mph. A bike that keeps pushing you past that speed is not a legal EAPC, and this is one of the most common ways a used e-bike turns out to be non-compliant.
Cyclesite Tip. Look for the 250W rating and the 15.5mph cut-off printed on the motor or stated in the handbook, since genuine EAPCs list both clearly.
Throttles and the law
An EAPC is a pedal-assist machine. The motor is meant to help while you pedal, not to drive the bike on its own. That is the point people most often get wrong.
There is one narrow exception. A walk-assist or start button that moves the bike up to walking pace, around 4mph (6km/h), without pedalling is allowed. It is there to help you push the bike up a ramp or ease away from a standstill.
A twist-and-go throttle that powers the bike to the full 15.5mph without any pedalling is a different matter. In almost all cases that needs type approval, and a bike with an unapproved throttle of that kind is not a standard EAPC. It is treated as a moped or motor vehicle instead. A small number of e-bikes did carry approved throttles under older rules, but if the seller cannot show that approval, assume it is not road legal as a bicycle.
Did the law change in 2026
You may have read that the limit rose to 500W. It did not. Here is the myth, and the fact.
In 2024 the Department for Transport ran a consultation. It asked whether the continuous power limit should double from 250W to 500W, and whether twist-and-go throttles up to 15.5mph should be allowed without type approval. The proposals drew thousands of responses, and most cycling and road-safety organisations opposed them.
In early 2025 the government decided not to proceed. The 250W rating and the 15.5mph cut-off stayed exactly as they were. So for 2026 the rules are unchanged. Anyone selling you a 500W bike as newly legal, or telling you the law has moved, is wrong. The clear line between a bicycle and a motor vehicle is still drawn at 250W and 15.5mph. Treat a listing that claims a 500W motor is "now legal" as a red flag, and read the spec carefully before you buy.
More powerful e-bikes and speed pedelecs
Plenty of electric bikes on sale are more powerful than an EAPC. A speed pedelec, for example, assists up to 28mph (45km/h) and appeals to riders with longer commutes. These are legal to own and ride, but not as bicycles.
Anything with a higher rated power, assistance beyond 15.5mph, or a full throttle counts as a motor vehicle. In practice that means registration, a licence, insurance, number plates and a helmet, and you cannot use it on cycle paths or shared-use tracks. Speed pedelecs also need type approval, which many models sold cheaply online simply do not have.
The same applies to a standard EAPC that has been de-restricted or tuned to remove the speed cut-off. The moment the motor helps past 15.5mph, the bike is legally a moped. Riding one on the road without the tax, insurance, licence and registration a moped needs carries the same penalties as riding any unregistered motor vehicle, and your insurance would not cover you in a crash. In practice the police can treat a de-restricted e-bike like any uninsured, unregistered motor vehicle, which can mean a fine, penalty points and the bike being seized.
Buying a used e-bike that stays legal
Most used e-bikes are perfectly legal, and buying second-hand is a sensible way to get more bike for your money. The job is simply to confirm the one in front of you is a genuine EAPC and has not been altered.
A few checks cover it. Read the motor markings and the handbook for the 250W rating and the 15.5mph cut-off. Ask the seller directly whether the bike has ever been de-restricted, tuned or fitted with an aftermarket throttle, and be wary of app settings that remove the speed cut-off or add an "off-road" mode. On a test ride, feel for the assistance easing off cleanly at 15.5mph rather than pulling on beyond it.
Do the usual second-hand safety steps too. Check the frame number against UK stolen-bike databases and confirm the seller can prove ownership, so you are not buying a bike reported to the police as stolen. Our stolen bike check is a quick first step.
When you are ready, browse used electric bikes on Cyclesite, and use our free valuation and sold prices to judge whether the asking price is fair. For more on condition and range, read our used electric bike guide and battery guide. If you are buying to commute, the cycle to work scheme guide is worth a look.
Cyclesite Tip. A short test ride is the easiest way to spot a de-restricted bike, because legal assistance fades out at 15.5mph and never carries you past it.
Common questions
Are electric bikes legal in the UK without a licence or insurance?
Yes, as long as the bike is a compliant EAPC: a motor rated at no more than 250W that stops assisting at 15.5mph, with a rider aged 14 or over. A legal EAPC needs no licence, tax, insurance or registration and is treated as a normal bicycle. Anything more powerful counts as a motor vehicle and does need all of those.
Did the UK e-bike power limit change to 500W in 2026?
No. The Department for Transport consulted in 2024 on raising the limit to 500W and allowing throttles, but in early 2025 the government decided not to proceed. For 2026 the rules are unchanged at 250W with a 15.5mph cut-off. Any claim that 500W bikes are newly legal is wrong.
Is a twist-and-go throttle legal on a UK e-bike?
Only in a limited form. A walk-assist throttle up to around 4mph is allowed. A throttle that drives the bike to the full 15.5mph without pedalling normally needs type approval, and without it the bike is treated as a moped rather than a bicycle.
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