Originally Posted by
bikemig
Is that what was installed? Not clear from the OP's posts whether the shop installed a short or medium cage version.
Sorry. I have responded to both threads. The LBS installed a RD-4500, which is a short cage.
Originally Posted by
dr_lha
Yeah, OK I missed that weirdness. Why the hell did they replace a 10 speed derailleur with a 9 speed one?
Must have been what they had on hand.
However, typically it should not have mattered. 6s,7s,8s,9s,10s; I have used them interchangeably without incident (except 7400 DA.)
In this case I have read that Shimano added the 30t cog when they went to 10 speed
in that group. Apparently, that's where the problem arises.