The Hope Standard Disc Brake Rotor 6Bolt is designed with a wider braking surface to make them more compatible with other brakes.Hope Standard Disc Brake Rotor 6Bolt Features:Standard rotors are laser cut from a sheet of custom steel for durabilityFloating rotors feature a custom steel braking surface riveted to an aluminum central carrier. Floating design compensates for thermal expansion with constant braking and self-centers to reduce dragWeight: 142g (180mm standard), 146g (180mm floating)Available in 140mm, 160mm, 180mm, 183mm, 200mm, and 203mm