I replaced the BB on my road bike a month or so back. I upgraded to an Ultegra one which was a smaller diameter but looked to be about the same width. Since I’ve had it on though I don’t seem to be able to get the chain in a position where it isn’t quite noisy on the cogs, sometimes to the point where you can feel it through the pedals.
To complicate matters, it’s had a new chain (done by a shop) recently. I’d expect some initial noise/roughness on the old rings/cassette, but it looks like what’s happening is the chainline is causing the chain to sort of briefly hang on the sides of the bigger cogs on the cassette, and then drop off and back onto the right cog.
Looking at the chainline it seems to be fairly obviously ‘bent’, but then you never really look at these things when everythings OK so I can’t really say if it’s worse than before.
Do I need to just perservere with the chainline or am I missing something stupid here?
It did occur to me the chain could be 9 spd or something (I’ve got a 10 speed setup) but I don’t think that’s likely.
