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thumbshifter slipping

christopher247christopher247 Posts: 68
edited September 2010 in MTB workshop & tech

I'm trying to fix an old bike with thumbshifters. The chainring thumbshifter is slipping and moving the chain from the big to the small chainring, even when I apply pressure to move it to the big chainring position. They are friction shift.

Any ideas?




  • Fiction shift would actually be better to sort out.

    Indexed you've got a problem. You need some way to clamp it harder to the indexing system.
  • redveeredvee Posts: 11,922
    There should be a thumbscrew to tighten the LH lever or it might be a phillips screw. What shifters are you using?
    I've added a signature to prove it is still possible.
  • There was a thumbscrew, and I've tightened it! Thank you!
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