Quick answer: An e-bike helmet is advised, not required by law, on an EAPC in Great Britain: the Highway Code says you should wear one, correctly sized and securely fastened. Outside the EAPC rules, the law classes an e-bike with motorcycles and mopeds: a motorcycle helmet is one of several road rules, and without them all the bike stays on private land.
When is a helmet advice, and when is it the law?
Whether a helmet is advice or a legal duty depends on what the vehicle is in law, not on how it looks. A stronger motor or a fast throttle can turn an e-bike into a different vehicle with a different rule. Still picking the bike itself? Adult e-bike basics come first, and the helmet decision follows from them.
| What you ride | Helmet | Where the rule comes from |
|---|---|---|
| An e-bike within the EAPC rules | Advised: a cycle helmet that fits and is fastened | Highway Code advice for cyclists |
| One outside those rules, for example with more than 250 W of continuous power | A motorcycle helmet, one of several moped rules on a road; without them all, private land only | GOV.UK's e-bike rules, and the Highway Code for motorcyclists (a legal duty) |
| A rental e-scooter from a trial scheme | Recommended, not a legal requirement | Department for Transport guidance for rental users |
The second row follows from how such bikes are classed:
A fat tyre e-bike with a motor above 250 W or motor assistance above 15.5 mph (25 km/h) is not an EAPC. In the UK it counts as a motorcycle or moped. A throttle that moves an e-bike above 3.7 mph (6 km/h) without pedalling needs vehicle approval.
The third row covers rental schemes only. It is illegal to ride a privately owned e-scooter on roads, pavements or cycle lanes, or in parks. Ride it only on private land, with the landowner's permission. Rental e-scooters from official trial schemes in parts of England have their own rules, and those rules do not apply to an e-scooter you own. For a day-to-day comparison of the two vehicles, see a scooter and an e-bike side by side.
What does the Highway Code ask of a cycle helmet?
The Code's advice is brief: a cycle helmet made to current regulations, sized correctly and done up securely. It adds that evidence suggests a correctly fitted helmet reduces the risk of a head injury in certain circumstances. A helmet helps in some falls, and no helmet prevents every injury.
The same rule covers clothing. Bright or fluorescent clothes make you easier to spot in daylight and gloom; after dark, reflective strips, bands or a reflective jacket do that job. On grey, wet days being seen matters too, and our guide to visibility on wet, dark rides has more.
How do you fit a cycle helmet in five checks?
- Measure first. Wrap a soft tape round your head, just over the eyebrows and over the tops of your ears, then find that figure on the maker's size chart. Between sizes? Try both on.
- Set it level. The front edge should sit low on the forehead, close to the eyebrows, not tipped back to show your hairline.
- Shape the straps. Each side strap should split around the ear, with the join just below the earlobe. Close the buckle under the chin so it is snug but still lets you swallow and talk.
- Tighten the cradle. Turn the rear dial or slide the adjuster until a firm shake and a nod leave the helmet where it was.
- Check it on the bike. Sit in your riding position with your usual glasses or sunglasses. You should see well ahead without the front edge or a peak in view, and a hard look over each shoulder should not shift the helmet.
If it still moves after all five checks, it is the wrong size or shape for your head. Try another model rather than over-tightening the straps.
Visor, peak or neither?
A peak is the small brim on many helmets. It keeps low sun and drizzle out of your eyes, but it can cut into your view ahead when you lean forward, which is why the fifth check matters. A visor is a clear or tinted shield that comes down over the eyes, often on a hinge or magnets, and keeps out wind, grit and insects.
- Clear for dull days and after dark. A tinted visor cuts the light you need at dusk.
- Scratches cost you sight. The Highway Code warns motorcyclists that scratched or poorly fitting eye protection limits their view, above all in bright sun and in the dark. A visor on a cycle helmet is no different.
- Misting. See how it behaves when you stop on a cold morning; some visors can be lifted slightly to let air through.
Does a faster e-bike need a different helmet?
An EAPC's motor gives no help beyond 15.5 mph (25 km/h), yet downhill or with a tailwind the bike may well pass that speed. Some cycle helmets are sold as designed for e-bikes and may add coverage at the back and sides, a visor or built-in lights. Read what the maker says the helmet is designed for, and let the five checks decide.
For a bike that is not an EAPC, a motorcycle helmet is one of the moped rules that then apply on a road; without the rest, the bike may only go on private land, if the landowner agrees. A helmet for a go-kart is a different design again.
Hiring a bike through your employer? Government guidance for employers running bike schemes lists cycle helmets among the safety equipment that may be included; check with your employer what its own scheme offers. For other questions, start from the kit and riding guides in our help centre.
Stop and replace the helmet
Do not ride in it again, and replace it or ask the maker, if:
- it has hit the ground hard or taken a blow, even if the outside looks fine;
- the shell has cracked, or the foam liner is dented, split or crumbling;
- the buckle will not lock, or a strap is frayed or torn;
- it still rocks forwards or backwards once the straps and cradle are adjusted.
In Great Britain, an e-bike can be ridden like a pedal bike – on roads and cycle paths, without a licence, registration, tax or insurance – only if it is an electrically assisted pedal cycle (EAPC): it has pedals that drive it, its motor has a continuous rated power of no more than 250 W, and the motor stops assisting above 15.5 mph (25 km/h). You must be 14 or over to ride one on the road, and no e-bike may be ridden on the pavement.
Questions riders ask
Can I wear a hat or a hood under a cycle helmet?
A thin cycling cap can work if the helmet still passes the fit checks with it on. A thick hat or a hood changes the fit and can stop the helmet sitting level, so fit the helmet for what you will actually wear underneath.
Is a helmet sold for e-bikes different from an ordinary cycle helmet?
Usually it is still a cycle helmet, with extras added, so the label alone settles nothing. On an EAPC, an ordinary cycle helmet that meets current regulations, fits and is fastened already follows the Highway Code's advice. Choose an e-bike model for a feature you want, rather than because of the motor.
Should I buy a used helmet?
It is hard to recommend. You cannot tell whether it has been dropped or crashed, and damage to the foam can be invisible from outside. A new helmet that you fit yourself removes that doubt.
How should I clean and store a helmet?
Most makers advise mild soap and water and no solvents or sprays. Keep it somewhere dry and away from heat, such as a hot car or a radiator, and follow the care notes that came with it.