The Campagnolo 33mm Alloy Freehub Body is the best way to get the most out of your Shimano cassette and favorite wheelset. This body is compatible with the Campagnolo Hyperon and Fulcrum Racing Rapid Red 500 wheelsets. It also features USB Ceramic Bearings which are great at reducing friction as much as possible and last a very long time. If you run a Shimano HG cassette, this freehub body is a great choice.