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Snap-On Electric Motor Powers Your Bike by Driving the Brake Rotor - Core77

The DiskDrive, by British startup Skarper, is a 6.6-pound object that snaps onto your bike, then powers it electrically by driving the rear brake rotor. Pop it off to recharge it (or prevent it from being stolen).

Using the system does require you to swap out your existing rotor, with this one of Skarper's design: Brake

Snap-On Electric Motor Powers Your Bike by Driving the Brake Rotor  - Core77

I'm sure it may vary bike to bike, but it's incredible how quickly and easily the unit snaps on and off in the demo video:

It takes 2.5 hours to charge the device from empty to full. The 250W motor has a maximum range of 60km (37 miles) and can propel you to a top speed of 32kph (20mph).

The DiskDrive is intended to ship next year, and Bike Radar says the target price is £1,000 (USD $1,239).

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Snap-On Electric Motor Powers Your Bike by Driving the Brake Rotor  - Core77

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