Originally Posted by
Bill Kapaun
When on the small ring, does it skip on all the cogs or not.
IF it only skips on the smallest cog or 2, don't use that combination. It's cross chaining which could be part/most of the problem.
Sorry, but no.
Cross chaining, or any chainring issue could cause skipping in the rear. The chain is fed onto cassette by the jockey wheel and anything forward of the RD wouldn't change that. (assuming that the RD is properly set up)