Originally Posted by
stedalus
33T is the smallest that will fit on a compact, and they're a little hard to come by. IRD makes some 10 speed 11-34 cassettes although they are somewhat expensive. You might also need to replace your rear derailleur.
Really?! Nice!
I've been told that someone got a 34t cog on a 9 speed equipped bike with a short cage RD and doesn't have problems. I thought there'd be rubbing, but if it works, it's something I would consider for the tougher climbing rides since I'm too stubborn to try a triple.