Originally Posted by
PlatyPius
I've never measured. I just remember the propaganda from Shimano in the 90s that said that "everything is narrower" and that you "must" upgrade everything. It wouldn't surprise me if there's no difference at all.
If I remember, I'll measure again this weekend and post the numbers. If nothing else, Shimano has likely adjusted the freeplay of the upper jockey pulley to deal with tighter spaced cassettes. Not sure what effect that would have on an older system though.