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The cable slips on my right 105 shifter - say after a bumpy descent - so I have to turn the adjuster to tighten it so that it shifts properly. This happened from new and I wasn't bothered about it enough to sort out but now I'm thinking about swapping frames I may as well sort out - what's the problem likely to be? Do I need a new cable adjuster? Where from?
Never heard of this. Sure it's not slipping at the clamp?
Just put a tiny bit of locktite on the thread (just a tiny bit) then it will stop the cable adjuster from turning - happend to my 105 kit on teh diagonal cable adjuster when I twised the handlebars and it kept loosening the tension. Is this your problem?
I am not sure if I have had the same problems as you. The threads in my frame mounted cable stops were slightly too big meaning that I could make fine adjustments but after a few shifts or a rough descent then the barrel would have moved back to its original position.
I cured it by taking the threaded barrel adjuster out of the frame stop and putting a small nut on it before rethreading in. I now use this as a lock nut and have not had any problems at all.
If your problem is with the frame stops then this would be one solution. If your problem is with the cable clamp at the shifter then I would suggest checking that you have the cable in correctly positioned in the clamp.