Occasional skipping only on big cog?
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  1. #1
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    Occasional skipping only on big cog?

    I have a 1x11 drivetrain on my MTB which had always worked great. I checked the chain and saw it was due for a replacement so I did. Shortly after I noticed a skip every now and then when under load in my lowest gear.

    If the cogs/chain ring were worn into the old chain I would expect this to happen when on the smallest cog (fewer teeth to grab) but it doesn't.

    The derailleur works fine so I don't think the cable tension is to blame and I don't see how replacing the chain would require adjustment to the limit screw.

    Could a new chain somehow exaggerate an issue with chain line when in that gear even though the old one didn't?

  2. #2
    'brifter' is f'ing stupid
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    Yes. Most likely related to chain wear.
    #promechaniclife

  3. #3
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    The cog you use the most will probably be the one that skips.

    Some chains are directional, so is yours run the right way?

    I'd check the low gear limit screw and the derailleur cable adjustment. That can cause the chain to skip.

    A tight link can cause a chain skip. Rotate the cranks backwards to see if the there's a tight link that bobble through the derailleur pulleys.

    If none of the above works, you probably need to replace the cassette.

  4. #4
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    recently replaced the chain and it immediately started skipping when climbing in small / big.

    figured the cassette was toast, so ordered a new one...

    while waiting for it to arrive, kept riding the old one and after 50 miles, the skipping stopped. didn't install the new cassette and have had zero issues in 2800 miles.
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  5. #5
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    Quote Originally Posted by mfdemicco View Post
    The cog you use the most will probably be the one that skips.
    This.

  6. #6
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    Quote Originally Posted by Oxtox View Post
    recently replaced the chain and it immediately started skipping when climbing in small / big.

    figured the cassette was toast, so ordered a new one...

    while waiting for it to arrive, kept riding the old one and after 50 miles, the skipping stopped. didn't install the new cassette and have had zero issues in 2800 miles.
    This has been my experience too. If the cassette is "on the edge" of wear, a new chain will bed in after a few miles and the skipping will resolve. I've seen it take much longer than 50 miles, but it beats replacing the cassette. I've worked on the assumption that when the new chain is worn out, by then the cassette will be totally worn and this trick won't work for a 3rd new chain. Haven't tested it though.

  7. #7
    Matnlely Dregaend
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    IF you use a Wippermann link and installed it reversed this may happen. Just something to check.
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  8. #8
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    Quote Originally Posted by Kerry Irons View Post
    This has been my experience too. If the cassette is "on the edge" of wear, a new chain will bed in after a few miles and the skipping will resolve. .
    I'll be darned, it's been about 70 miles since I posted this and it does indeed seem that the skipping stopped.

    Cool.

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