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A free hub is a component in a bicycle's drivetrain system that allows the rear wheel to spin independently of the pedals when coasting. It contains a mechanism that disengages the drive system, allowing the rider to coast without pedaling. When the rider starts pedaling again, the mechanism re-engages, transferring power from the pedals to the rear wheel to propel the bike forward.

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Q: What is a free hub and how does it function in a bicycle's drivetrain system?
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