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How do you prep a new chain?
(leminal.space)
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If your chain was that bad you almost definitely need a new cassette (back) and maybe even a new chain ring (front).
Not true. You can easily get three chains per cassette if you’re good about checking chain lengthening. Even more for a chainring.
OP said the chain was worse than the max measurement on the tool, but now I'm remembering that it's just a pass/fail tool. At first I was thinking they meant their chain finally got replaced long after it should have.
The max measurement is when you swap chains.