Chain slipping during shifting

paulieb2006
paulieb2006 Posts: 318
edited August 2010 in Workshop
Can anybody give me a bit of advice. When I am changing in the middle of the cassette the chain keeps skipping. Its just not quite rightly indexed. Can I fix this with one of the Thumbscrews on the frame or do I have to start again and index the whole lot of it. Its a Durace cassette with Ultegra SL rear mech.
Thanks
Paulieb
http://i870.photobucket.com/albums/ab26 ... C05883.jpg

Comments

  • Monty Dog
    Monty Dog Posts: 20,614
    Chain skipping is more a symptom of a worn chain or cassette - or new chain on a worn cassette
    Make mine an Italian, with Campagnolo on the side..
  • paulieb2006
    paulieb2006 Posts: 318
    Monty Dog wrote:
    Chain skipping is more a symptom of a worn chain or cassette - or new chain on a worn cassette
    Both are less than 12 months old. About 3000km done on them
    http://i870.photobucket.com/albums/ab26 ... C05883.jpg
  • keef66
    keef66 Posts: 13,123
    Skipping is when the chain jumps forward over the sprocket teeth under load. Very common with a new chain on a worn cassette.

    Since your cassette and chain have worn together for just a year this is unlikely. I suspect from your description that you're right, and the indexing is slightly out which means the chain is catching on the cogs of an adjacent sprocket. Just needs a tweak using the barrel adjuster on the downtube.

    Thumbscrews are, I believe, illegal these days. :wink:

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