Originally Posted by Road Runner
I just changed out my cassette(12X25) to a 11X28. My der jocky wheel seems to bounce and bump(against the cog) when in big ring and #11 cog. I had to move the "B" screw a good ways to correct the condition. Can I go too far, and is this the proper adjustment to make. Still new and learning. Thanks for any help.
Big ring and the 11 cog seems to me like a goofy gear combination to have this problem. I'd expect to find it in either the big/big or little/little combination. I'm wondering if you put on a new chain and didn't size it first. If that's the case, it's likely to be way too long and might cause the problem that you are describing.