E-Bikes

An electric bike for adults pairs an ordinary pedal cycle with motor assistance that comes in as you pedal, fed by a rechargeable battery. Frame size, motor type and battery capacity shape how it rides, and one rule settles where it goes: 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.

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E-Bikes

The main types, from hybrid to fat tyre

Most electric bikes for adults fall into a handful of types, and the type matters more than any one figure on the spec sheet.

  • Hybrid. A general-purpose frame with an upright position, with mudguards and a rack as options. The usual choice for mixed riding on tarmac and firm tracks.
  • Mountain. Suspension, broad treaded tyres and lower gearing for rough ground. Heavier, and more bike than you need for smooth surfaces.
  • Folding. Small wheels and a hinged frame that packs down for a car boot or a cupboard. Check the folded weight before you choose one, because you will lift it often.
  • Cargo. A long frame or a box at the front for carrying loads. Stability and brakes count for more than speed.
  • Three-wheel. A 3-wheel electric bike for adults stays upright at a standstill, which suits riders who find balancing hard. It needs more storage space and handles differently in turns.
  • Fat tyre. Very wide, low-pressure tyres for soft ground. Read the classification of any fat tyre model before anything else, against the rules further down this page.

Whatever the type, the same three parts decide how it rides: the motor, the sensor that tells the motor when to help, and the battery.

Motor, sensor and battery: what to look at

  • Motor position. A hub motor sits in the front or rear wheel and pushes the wheel directly. It is simple and needs little maintenance. A mid-drive unit is mounted at the cranks and drives through the bike's gears, so it copes better with long uphill stretches but wears the chain and sprockets faster.
  • Sensor. A cadence sensor switches the motor on when the pedals turn, at a set level of help. A torque sensor reads the force on the pedals and scales its help to match, which feels more natural and smoother at low speed.
  • Battery. Capacity is given in watt-hours, or as a voltage and an amp-hour figure, which multiplied together give watt-hours. More watt-hours means more energy on board, not a promised distance.

Understanding what each part of an e-bike does makes the spec sheet easier to read, because every component changes what you feel as you set off and on a long uphill drag. Riders also ask how fast an electric bike can go; how fast the motor will help you go is set by the cut-off in the rules below rather than by the size of the motor.

If you would rather convert your current pedal bike, an electric bike conversion kit raises questions of its own about the rules and the battery.

Frame size and fit for adult riders

Size the frame before you look at anything else, because a motor makes a badly fitting bike feel worse, not better. Makers give frame sizes by rider height and inside leg; use both, measured in your riding shoes.

Three checks tell you most of what you need. Standing over the top tube or the lowest part of the frame, you should have a gap between yourself and the bike. Sitting on the saddle with a pedal at its lowest point, your leg should be almost straight. Holding the bars, your arms should be slightly bent and your back comfortable, without stretching.

An e-bike weighs more than a pedal bike, so check that you can lift it onto a stand, over a step or into a car if you need to. A step-through frame makes getting on and off easier for many riders, and a lower frame helps if you will often stop and start.

If you have never learned to cycle, start without a motor. Learning on a balance bike as an adult builds balance first, and the move to an e-bike is easier afterwards.

Charging, storing and battery care

The battery is usually one of the costliest parts of an e-bike to replace, and the one that needs most care. Follow the charging instructions that came with it, and use the charger supplied for that battery: one with a matching plug can still be wrong in ways you cannot see.

Charge where someone can watch it, on a hard surface clear of exits, and unplug it when it is full. If the battery comes off the bike, you have more choice of where to charge it; how to charge an electric bike battery weighs up indoors and the shed.

Batteries age. Range shrinks, charging finishes sooner, and an old pack may cut out under load. The working life of an e-bike battery turns on charging habits, storage and riding. For winter or a long break, keep it somewhere cool and dry, shaded and away from doorways; storing an e-bike battery for the winter covers the rest.

Watch for the warning signs: heat you would not expect, a swollen case, hissing or crackling sounds, an odd smell, or smoke. Stop using it at once, and find out what each lithium battery warning sign means.

The rules in one block

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.

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.

A bike that meets these rules must carry a marking that shows the motor's continuous power output and the bike maker's name, plus either the battery voltage or the speed where motor help cuts out. Look for it before you pay.

Two questions often follow. Getting an e-bike through an employer cycle scheme is possible at some workplaces, so ask your employer what theirs covers. If you are also weighing up a scooter for private land, look at an e-bike set against an e-scooter in riding, storage and upkeep, not only in the rules.

Sources we checked (last checked 25 October 2026):

Guides on e-bikes

E-bikes: questions

Which e-bikes may be ridden on the road in Great Britain?

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.

Hub motor or mid-drive: what is the difference?

A hub motor sits in a wheel and pushes it directly: simple, low-maintenance and fine for mostly level riding. A mid-drive unit, fitted at the cranks, works through the gears, which helps on long uphill stretches but wears the chain and sprockets sooner.

How far does an e-bike go on one charge?

It rests on the battery's watt-hours, the level of assistance, the rider's weight, wind, temperature and tyre pressure. Treat any single number with caution: electric bike range becomes clearer when you know how many watt-hours you use per mile.

How should I charge an e-bike battery at home?

With the charger supplied for that battery, following the maker's instructions, within sight and clear of exits. Unplug it when it is full, and if the pack is still warm after a ride, wait for it to cool before charging.

How long does an e-bike battery last?

There is no single figure: it depends on the cells, the number of charges and how the battery is stored. Check the maker's figure for charge cycles, and treat shorter range, quicker charging and cutting out under load as signs of age.

What frame size do I need?

Go by the maker's size chart for your height and inside leg, then check three things: room to stand over the frame, an almost straight leg at the bottom of each pedal stroke and a comfortable reach to the bars. For other vehicles, start from the help centre's guides by ride.

Can I ride an e-bike in the rain?

Many riders do, with care. Allow more distance for braking, slow down for corners and painted lines, keep the battery contacts and charging port dry, and never jet-wash the motor. Dry the bike off before charging; riding an e-bike in the wet has a full routine.

Do I need a helmet on an e-bike?

Wear one every time. Cyclists are advised by the Highway Code to ride in a correctly sized cycle helmet, securely fastened. Choosing and fitting an e-bike helmet comes down to size, straps and position.