Stock replacement rotors for Hope disc brakes with International Standard 6-bolt/44mm-BCD rotor mounting . Mono-Mini/M4 aluminum-carrier, 2-piece floating design rotors are interchangable with 1-piece fixed style of the same diameter (1-piece style needed if using CenterLock to 6-bolt adapter). Saw profile rotors (new for 2007) are interchangable with older Mono-series. 2006+ 74mm caliper Mono-series brakes use updated rotor sizes: Mini/M4/M6 use 183/203mm with appropriate adapters instead of 180/185/205mm. *2007+ Moto-V2/FR rotor: unique 3mm thickness with internal, center-plane vent/ports (will not fit other brakes, Hope or otherwise).