Having a wobble problem with an Ultegra 10spd cassette I installed on my training wheels. I took the cassette off my Jet which has the OEM HED hub on it. I never had a problem. Put it on the Ritchey and it wobbles badly and jumps gears. Compatibility or something else? I bought the wheelset from a friend so I’m confident that the rear wheels is in good condition.
I think that was it, although both are 10spd hubs and cassettes. When I was swapping between my race wheels and my training wheels I noticed a washer/spacer on the floor that I didn’t know what to do with. Took the cassette off and put the spacer on, viola!!