Elegant and advanced design using the best materials to date is what we have come to expect from Campagnolo's top offering - Super Record. The UltraShift carbon cage has graduated curvature for precise shifting between the small and large chainrings. Campy engineers serve up 2 designs that work in tandem to maximize cage and linkage rigidity to give a solid, quick and effortless shifting feel: a Z-Shape inner cage coupled with Campy's M-Brace swing arm and geometry. The AFT(Anti Friction Treatment) applied to the inner plates help chain glide and improves longevity. Full titanium bolt kit and red graphics round out the package. choose form 32.0mm and 35.0mm for the proper size for your frame.