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Derailleur gears in a bicycle's transmission system work by moving the chain between different sized sprockets on the rear wheel and front crankset. This changes the gear ratio, allowing the rider to pedal more easily or with more power depending on the terrain. The derailleur mechanism is controlled by shifters on the handlebars, which move the chain to different gears by adjusting the tension in the derailleur cables.

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5mo ago

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