So, I have a Niner with full XX and I9 Ultralight wheels. My LBS can't seem to get the shifting in the rear to work well. They have tried a different chain which helped a little but not much. It works with an XT cassette which made us think the XX was defective but when they tried the warrantied XX one, it still didn't work. Could the wheels be an issue? Help, I'm about to rip everything off and go back to SS.
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Thread: A9C XX owners help with shifting