My bike chain is worn to the 1% gauge on my indicator but only on certain links. I could check a different link and it won't fit at all. However it would drop right through on certain links.

Should I be looking at replacing the chain and rear cassette?

  • How many places, percentage wise, does it "drop right through"? Apr 22 '15 at 23:48
  • 2
    Uneven wear is a good enough reason to replace the chain. And odds are if the chain is worn so is the cassette. Apr 23 '15 at 0:34
  • 1
    If you have a master link make sure you are not measuring over it. Sometimes they can add a tiny bit of extra length to the chain so that when the measuring tool spans a master link it can give inaccurate results.
    – Stainy
    Apr 23 '15 at 13:55

I would replace the chain at such condition (if there are 3 or more places or if there are multiple links).
About the cassette it's another question, and if you can't decide yourself, it should be checked in LBS probably.

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