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If I change my cassette to a new one, should I also change the chain?

I measured the chain with a wear gauge and it's ok.

Just to emphasize the obvious: I'm changing the cassette to one of exactly the same type.

5

Depends on how worn the chain is. If it's relatively new go ahead and use it. If it's at or approaching 0.5% stretch, just get a new one.

  • I have a simple wear gauge, which say ok or not ok. How I can measure the 0.5% stretch? – Michael D Sep 5 at 12:21
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    How long have you had the chain, any idea of how many miles? Does the wear gauge feel like it would go in if you forced it? – Argenti Apparatus Sep 5 at 12:41
  • About 6 months, I would estimate it as about 250 miles. Yes, the wear gauge would go in if I force it. – Michael D Sep 5 at 12:49
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    250 miles is not very much, especially if you are not riding hard. – Argenti Apparatus Sep 5 at 14:00
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    At 250 miles the chain is near new unless it was (very) poor quality. I'd keep it on. – Carel Sep 6 at 7:05
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As a rule of thumb, new cassette and new chain. Keep the old one as a spare, but 250 miles is nothing and would be good to go with a new cassette. Generally you should get 2 to 3 chains per cassette.

1

The consensus seems to be that a worn chain will accelerate cassette and chainring wear. I think if it’s not worn much (you could measure with a sliding caliper) you could keep using it. Otherwise install a new chain and use the current chain when it’s time for a chain replacement.

Worn chain on new chainrings can cause chain suck, but I think this is not the case for cassettes.

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