Originally Posted by
joejack951
It's been a while since I measured but I don't recall seeing any real cage width difference between 8, 9, and 10 speed rear deraillers. Front deraillers are a different story.
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.