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7 comments
Glad it worked out for you Gordon. Looks a nice bike that Genesis.
Yay! B-screw loosened a couple of turns and all is good in 28-12 world. Thanks for the suggestion...
Genius - thanks for that. I'll have a go this evening but that makes a lot of sense...
Apologies if this is stating the obvious but have you considered the 'B-screw'? The upper pulley needs to track the cogs of cassette as close as possible and if you have a widely spread cassette there will be a wider gap in the middle compared to the extremes (12 and 28?) at each end. Think of it as a concave section. I've had a similar issue with a 11-28 Ultegra cassette I bastardised.
What condition are your chainrings in? i had the same issue after replacing chain and cassette a couple of years ago on one of my bikes, it only happened in the big ring though. I replaced the chainring as the teeth were pretty worn and it fixed the problem straight away.
jockey wheels could be worn and leading to this problem also
When I put the new cable on I removed cleaned out the barrel adjuster and reset the indexing from scratch, so I don't think that's it.
Hmm. Have you tried re-indexing the mech from scratch? Odd that it's the middle range that's going wrong.