Hmmm. I typically run a standard 52/39, but I have a compact 50/34 which I like to swap on for long hilly rides sometimes, but I dont' leave it on because the Octalink V1 118 BB that came with it is too long and messes up the chainline and makes front shifting difficult, and I haven't gotten around to getting the 109.5 that I think would be correct. But I'm not worried about big rear shifts when changing rings; that's the point of limiting overlap, no?