Campy 9-speed shifters pull too much cable per shift to operate a shimano derailleur. A 10 speed shifter can be made to work if the cable attachment to the rear derailleur is altered. There are also companies that make conversion devices that alter the amount of cable pull.
A forum community dedicated to Road Bike owners and enthusiasts. Come join the discussion about bike parts, components, deals, performance, modifications, classifieds, troubleshooting, maintenance, and more!