The freewheel is a ratcheting mechanism, that coupled with a set of gears, is that threaded onto the rear hub of a bike. The freewheel allows the rear wheel to engage and move when the pedals are spun forward, but coast freely when the pedals are stationary or spun backwards.

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My BionX system won't work in assistance mode, and makes a weird noise

I've had to remove and reinstall my rear wheel because of a flat, and now the BionX system has stopped working correctly. When I turn it on, it works fine, and the regenerative breaking works fine. A ...
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Raleigh Rapide Component Upgrade

Raleigh Rapide, it's a 27" 12 speed road bike built in the 1980s. It has a cottered crankset that is not in 'sync', that is one crank-arm is not inline with the other one. I want to upgrade the bike ...