TRP CL81 Disc Brake Rotor 6-Bolt to Center Lock System This TRP adapter convieniently allows riders to use their 6-bolt rotors with Center Lock type hubs to allow more flexibility for hub and rotor choice. Features Includes all necessary parts for adapting 6-bolt rotors to Center Lock hubs Allows more flexibility for hub and rotor choice | Trp | 6-Bolt To Centerlock Adapter Internal Spline (For Axles Up To 12Mm)