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Why new chain with new cassette

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Why new chain with new cassette

Old 12-30-15, 04:15 PM
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Why new chain with new cassette

Why do you have to replace the chain if you are replacing a cassette.
My chain isn't stretched.
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Old 12-30-15, 04:22 PM
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Are you sure? Have you measured ? a New chain 1/2" pitch per link .. so 12" of chain (24 centers of pins) is 12.00"

Got a etched steel 12" ruler ? I suggest Buying one.
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Old 12-30-15, 04:32 PM
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However much wear your chain has, it will wear down your new cassette to that point in short order. If your chain only has a few hundred miles on it, you might not mind wearing your cassette by that amount.
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Old 12-30-15, 04:37 PM
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Unless a chain has very few miles, it won't mesh properly with a new cassette cogs, particularly the smaller, most used ones. The result is it will "skip" under load. As to whether your chain is "stretched", that is most commonly measured by using a good ruler over 24 pins. A new chain should measure 12" exactly. A measurement of 12-1/16" is really marginal and 12-1/8" is the "throw both it and the cassette away" point.
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