My cassette is a 12/25 The lowest gear I can find in a campy cassette is 29. I would like something lower and want to avoid going to a compact crank too.Found an IRD "campy compatable" 10 cassette in 11/34. The question is will the the centuar RD work on this? Cant seem to find any thing about the centaur RD coming in short or long cage. Any one have any experence with these IRD cassettes? Shifting? Etc.