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  1. #1
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    Drivetrain Issue

    Recently I changed my chain and rear cassette on my bike. Since then, I seem to be having an issue of the chain hopping off of the front chain rings when going over super bumpy stuff. I cut the new chain to the same length as the old one, but never had any issues with the prior chain. Could the problem be that I need to remove another link from the chain? Is it possible that the deraileur spring that keeps tension on the chain is worn out? Any ideas would be fantastic.

    Thanks

  2. #2
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    It's probably worn chainrings. If the previous chain and cassette were very worn then you'll find that the 'rings need to be changed at the same time.

    Tim

  3. #3
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    why would worn front chainrings cause the chain to come off when going over bumpy stuff? Under load, they work just fine.

  4. #4
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    Because the chain may not sit as low on the teeth as it did when the chain and the rings were together.

    Tim

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