Quote Originally Posted by dachshund View Post
The IRD 11-34 is also supposed to work with a Campy compact 34-50 and a medium cage derailleur.
The Basics
http://bluecollarmtb.com/2007/06/19/...ity-explained/

So which Campy derailleur should you pick? Read the yellow box a little way down the page.
http://www.branfordbike.com/cgi-bin/...R_ID=647623406

Branford Bike is my "go to" place for all things Campy.