Types of conversion kit
There are several options when it comes to e-bike upgrade kits. Here's what to look for. Remember that in the UK the maximum continuous power output of an e-bike motor is 250W.
Hub motor kits
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Hub motor kits replace one or other of your existing bike wheels with one that has a motor built in to the hub.
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Front wheel motors are easiest to fit as there are no gears to think about.
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Rear wheel motors give better traction on heavily-laden bikes and climbs, but they're slightly trickier to fit.
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Any wheel motor will apply forces to the frame and fork that they weren't necessarily designed for, so make sure they're sturdy.
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Your motorised wheel needs to be the same size and brake type as the original wheel, and with the same kind of axle. Most suppliers will help you to get the right kit.
Mid-drive motor kits
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Mid-drive motors connect to a chainring and drive the bike through its existing transmission and gears.
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They're more efficient then wheel motors and better on hills.
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But retrofitting them is trickier as you have to remove the existing cranks and chainrings.
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There are fewer options for mid-drive kits.
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The more conventional your bike is and the simpler the frame design, the more likely it is that you can find a mid-drive kit that'll work.
Key takeaways
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Front wheel motors are the easiest to fit, followed by rear wheel motors and then mid-drive motors.
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Check compatibility (wheel size, axle and brake type) carefully before buying.
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Most frames and forks won't be designed for motors so don't expect any warranties to remain valid!
If you'd like to find out more, read our guide to front wheel DIY e-bike conversion.