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Derailleurs aggressively push the chain

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Hook: Changing gears on a bike involves violently shoving a metal chain off its current path. Explanation: The derailleur is a mechanism that physically forces the chain sideways while you pedal. It physically derails the chain from one sprocket to another, altering your pedaling resistance and making steep hills slightly less agonizing.

Derailleurs aggressively push the chain
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