Comparison
Front vs rear hub e-bike conversion kit: which is better?
Published
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In short
A front hub kit is easier to fit, keeps your existing gears and rear wheel, and suits most commuter and hybrid bikes with a strong steel or aluminium fork. A rear hub kit gives better traction on hills and wet ground and feels more natural, but fitting is harder because you move your cassette or freewheel across. Neither suits carbon or suspension forks unless the kit maker says so.
Products for this job
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Our verdict
Choose a front hub kit for the simplest fit on a flat or rolling commute. Choose a rear hub kit for hilly routes, wet winter riding and a more natural feel, if you are happy to move your gears across.
Hub motor conversion kits replace one wheel with a wheel that has a motor built into its centre. You then add a battery, controller, pedal sensor and display. The big decision is which wheel to replace. Each choice changes how the bike rides, how hard the job is and which bikes it suits. This comparison covers both, assuming a UK-legal kit with a 250 W rated motor and assist that stops at 15.5 mph.
Front and rear hub kits compared
The table covers the points that most often decide the choice. Our hub motor vs mid-drive guide covers the third option.
| Point | Front hub | Rear hub |
|---|---|---|
| Fitting difficulty | Easiest | Moderate |
| Gears | Keep existing rear wheel | Fit your cassette or freewheel to the motor wheel |
| Traction on wet hills | Front wheel can slip | Better, weight is over the rear |
| Feel | Pulling sensation | Pushing, closer to a factory e-bike |
| Weight balance | Front-heavy with a down tube battery | More rear-heavy |
| Puncture repair | Front wheel, fewer parts | Rear wheel, motor cable and gears |
| Fork and frame needs | Strong fork with suitable dropouts | Frame dropouts must fit the motor axle |
Fitting and compatibility
A front kit is the classic first conversion. You swap the front wheel, fit the battery and controller, run cables along the frame and add brake sensors and a pedal sensor. Your gears are not touched. The main checks are that the fork dropout width matches the motor, usually 100 mm, and that the fork is strong enough.
A rear kit means fitting your gears to the motor wheel. Cassette motors need a compatible cassette, and freewheel motors need a screw-on freewheel. Rear dropout width must match, commonly 135 mm on hybrids and older mountain bikes. Disc brake bikes also need the rotor to line up with the caliper. Our conversion kit installation guide walks through the steps.
Riding feel and traction
A front hub pulls the bike along. On dry roads that feels fine, and because the motor drives the front while your legs drive the rear, it can feel surprisingly stable. On wet leaves, gravel or steep climbs, the front wheel has less weight on it and can spin, especially when you stand up.
A rear hub pushes from behind, which is how most factory e-bikes feel. Traction is better on hills and loose surfaces, and steering is unaffected by the motor. For hilly areas or year-round commuting, the rear option is usually nicer to ride.
Safety: forks, torque arms and dropouts
Hub motors push against the dropouts with every turn. Aluminium and lightweight forks can be damaged if the axle spins in the dropout, which is why many kits include a torque arm. Fit it as the instructions say and check axle nuts regularly. Never fit a hub motor to a carbon fork or a fork the kit maker does not approve.
Brake sensors are not optional extras. They cut the motor when you brake, which matters on a converted bike where the original brakes were sized for a lighter machine. Check that the brakes are in good condition before and after conversion.
Note:If you are not confident with wheels, brakes and electrical connections, have a bike shop fit the kit. A badly fitted motor wheel or loose axle can fail while riding. Charge the battery only with the charger supplied.
Staying within UK rules
A converted bike is only an EAPC if the finished bike meets the rules: motor rated at 250 W continuous, assist cut off at 15.5 mph and power only while pedalling, apart from walk assist up to 6 km/h. Many kits on sale are 500 W to 1000 W or come with throttles. Those make the bike a motor vehicle on UK roads. Read are e-bike conversion kits legal in the UK and the gov.uk rules before buying, and use our UK e-bike law check on any kit you are considering.
For a ready-made alternative with the same legal limits, see our guide to electric hybrid bikes.
Frequently asked questions
Which is easier to install, front or rear hub? Front. You keep your rear wheel and gears, so there is less to adjust.
Is a rear hub better for hills? Usually, because the rear wheel carries more weight and grips better when the motor pushes.
Can I fit a front hub to a suspension fork? Only if the kit maker approves it. Many suspension forks are not designed for motor torque.
Does a hub motor kit keep my bike legal? Only if it is rated at 250 W, cuts assist at 15.5 mph and has no throttle beyond walk assist.
What you need
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Carpat GB1: EN 15194, Shimano hydraulic discs
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