The specialized roval cl 40 disc scs 700c wheel rear the cl 40 full carbon disc clincher with scs hub is the perfect all around disc wheel the scs rear hub allows for a proper chainline on short chainstay performance road and cyclocross bikes the aerodynamic optimized rim shape slices through the wind while preserving the confident stable handling of a box section rim a wide internal rim width provides an optimal tyre profile for incredibly precise handling and stiffness the scs centre lock