Campagnolo 11-speed rear derailleurs work better with our pulleys, which are a marked improvement over stock. Ours reduce frictional drag and increase bearing life. Less drag means more power transmitted to the rear wheel.
There are three options. First is machined aluminum pulleys with our stock CeramicSpeed Balls installed in our hardened-steel races. This is our Standard Bearings. These test better than anything else on the market.
These are compatible with all 11-speed Campagnolo derailleurs, mechanical and electronic.