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The fold-over gear mechanism in bicycle drivetrains is a marvel of modern engineering. With the help of this device, gears can be shifted to allow for different pedaling speeds and inclines without dismounting from one’s steed or having some other riders do it on your behalf.

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The fold-over gear mechanism in bicycle drivetrains is a marvel of modern engineering. With the help of this device, gears can be shifted to allow for different pedaling speeds and inclines without dismounting from one's steed or having some other riders do it on your behalf.
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