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To propel most bicycles, the rider straddles the saddle and uses his or her legs and feet to rotate the pedals around the crank axle. The pedals, in turn, are fixed to a chain ring (sprocket) with teeth that engages the bicycle’s continuous chain. The chain then transmits the pedaling action to a cog on the hub of the rear wheel, causing the rear wheel to rotate and drive the bicycle forward. On most bicycles, cogs are mounted on a freewheel or cassette mechanism that allows the rear wheel to continue turning even if the rider stops pedaling and coasts. |
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