Comparison
Hub motor vs mid-drive e-bikes
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In short
A hub motor sits in the front or rear wheel and drives it directly; a mid-drive sits at the cranks and drives the chain, so it uses the bike's gears. Mid-drives usually climb better and feel more natural, but wear chains and cassettes faster and cost more. Hub motors are simpler, quieter for the drivetrain and easier to fit as a kit. Both can be legal 250 W EAPC motors in the UK.
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Our verdict
Choose a mid-drive if you ride steep or long climbs and want the most natural feel, and budget for faster chain and cassette wear. Choose a hub motor for town riding, moderate hills, simpler maintenance and the easiest conversion kit fitting.
Motor position is one of the first choices you face when buying an e-bike or a conversion kit. It changes how the bike climbs, how it balances, what wears out and what a repair involves. Neither layout is best for everyone. This guide explains how each works, compares them on hills, maintenance and fitting, and helps you match the motor to your riding.
Where each motor sits
A front hub motor is built into the front wheel. A rear hub motor is built into the back wheel, alongside the cassette or a single sprocket. A mid-drive motor sits at the bottom bracket, where the cranks attach, and turns the chainring, so its power goes through the chain and gears like your legs do.
Factory e-bikes with mid-drives use frames designed around the motor. Mid-drive conversion kits replace the bottom bracket on a standard frame.
Side-by-side comparison
These are the general differences. Individual motors vary, so check the maker's details.
| Factor | Hub motor | Mid-drive |
|---|---|---|
| Uses bike gears | No | Yes |
| Steep hills | Good on moderate hills; can struggle on long steep climbs | Strong, as low gears multiply torque |
| Ride feel | Push or pull from the wheel | Natural, centred feel |
| Weight balance | Weight at front or back | Low and central |
| Drivetrain wear | Normal chain wear | Faster chain and cassette wear |
| Puncture repair | Wheel removal involves motor cable | Wheels remove as normal |
| Conversion kit fitting | Simpler, wheel swap | More involved, bottom bracket swap |
| Typical sensor | Cadence, some torque | Often torque on factory bikes |
Hills and how the power feels
Because a mid-drive drives the chain, shifting to a low gear lets the motor spin at an efficient speed while the wheel turns slowly. That is why mid-drives feel strong on steep, long climbs. The power also feels like stronger legs, especially when paired with a torque sensor.
A hub motor turns at wheel speed, so on a steep climb at low speed it works harder and can heat up. On gentle and moderate hills, and in town, a 250 W hub motor is perfectly capable. Front hubs can make the steering feel pulled; rear hubs feel more like a push from behind. Our torque vs cadence sensor guide explains how the sensor changes the feel.
What wears faster
A mid-drive sends motor and rider power through the chain, chainring and cassette, so these parts wear faster than on a pedal bike. Shifting under heavy load adds wear, so ease off the pedals briefly when you change gear. Some e-bike specific chains and cassettes are made to cope.
A hub motor leaves the drivetrain to your legs alone, so chain wear is similar to a normal bike. The extra weight of the motor in the wheel puts more load on spokes and the rim, which should be checked. Both types add load to brake pads because the bike is heavier.
Repairs and punctures
Removing a hub motor wheel to fix a puncture means unplugging the motor cable and, on many bikes, undoing axle nuts rather than a quick release. It is not difficult, but it takes longer. Mid-drive bikes keep standard wheels, which makes punctures and wheel swaps easier.
Motor faults are a different matter. Hub motors are fairly simple and many shops can replace one. Factory mid-drives are often serviced by brand dealers. Spares for less common brands can be harder to find, so check what support the seller offers before you buy.
Which suits a conversion kit
Front hub kits are the simplest to fit: swap the front wheel, fit the battery, sensor and display. They suit bikes with a strong steel or aluminium fork, ideally with torque arms. Rear hub kits give better traction and a more natural push but involve gears. Mid-drive kits need a compatible bottom bracket shell and more tools, and reward you with better climbing. See Swytch vs Bafang for two common kit types and are conversion kits legal in the UK for the 250 W rules.
For a ready-built bike, most budget e-bikes use rear hub motors. Our electric bikes under 1,000 guide shows typical examples.
Frequently asked questions
Is a mid-drive better than a hub motor? For steep hills and a natural feel, usually. For simplicity, low drivetrain wear and easy kit fitting, a hub motor often wins.
Is a mid-drive more powerful? Not in rated power; both are limited to 250 W on a UK EAPC. A mid-drive uses the gears, so it climbs more effectively.
Do hub motors wear out? They have bearings and, in geared hubs, internal gears that wear over time, but they need little routine care.
Which is easier to maintain? A hub motor bike keeps a normal drivetrain. A mid-drive needs more frequent chain and cassette replacement.
What you need
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Carpat GB1: EN 15194, Shimano hydraulic discs