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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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How to adjust drivetrain so I don't pedal empty air?

Hubs have a ratcheting mechanism inside that allows them to freewheel when they're not receiving power from the cranks. …
Tristan C.'s user avatar