CNC machined adapter for floating (spoke mount) brake rotors on Arlen Ness? cartridge wheel hubs, Allows the use of factory '14-'24 FLT spoke mounted rotors on aftermarket billet wheels with 3.25" bolt circle, Accepts both factory and aftermarket 11.8" front spoke mount style rotors , Forged from aluminum and CNC machined to a perfect finish , Coped cut out design follows the sculpted lines of Ness cartridge hubs & reduces weight , With an installed 11.8" spoke mount type rotor, the adapter becomes a lightweight complete performance rotor, Includes hub mounting hardware and accepts factory rotor hardware, Does not fit Flare 5 or Drift Ness wheels., Designed only to be used on all Arlen Ness? wheels with cartridge type wheel hubs