SM-RT67 rotors give excellent performance using the proven Shimano Centre-Lock system providing excellent rigidity & security with an easy set-up Precision cut stainless steel braking surface improves pad clearing in muddy conditions while aiding cooling under high load Rotor contact surface has been developed for excellent pad clearing & cooling which increases pad performance & life Large forged alloy spider supports rotor surface increasing rigidity & reducing weight Comes complete with alloy lockring