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Usually what happens is that the chain elongates under wear, which forces the rollers farther apart. Depending on set-up this can then cause the chain to ride higher up on the teeth of the sprocket, eventually to the point where it can jump over the top of the teeth. On other set-ups the elongated chain will wear out the flanks of the teeth to the point where their angle can no longer retain the chain.

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16y ago

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What causes a bike chain to slip while riding?

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Why did the chain pop off your bike?

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