I had my store do the install of my e-bay parts. I went from a 12-25 to an 11-32 8-sp Shimano cassette from Fibica/Ebay online. No problems whatsoever with the rear derailure. The front shifting was problematic, and it was apparent to me, a novice that my chain, which was replaced at this time, was way too short. Bit the RD was no problem, and I don't understand why it would be. Shimano 8-sp 2200 STI shifters. I then replaced the front chainset, again, with new and inexpensive Shimano Tiagra from FleaBay to a 50/34 and everything is fine and as it should be. The rear derail is a Sora and I would venture to say it's the "long" one.