The Shimano SM-RT64 rotors offer secure and easy set-up with the proven Centre-Lock mounting system. The precision-cut stainless steel braking surface improves pad clearing in muddy conditions while aiding cooling under high load. The rotor contact surface has been developed for excellent pad clearing and cooling, which increases pad performance and life. An alloy spider supports the rotor surface, increasing rigidity and reducing weight. This rotor is compatible with resin and metal brake pads and comes complete with a steel lockring. Average weight for a 160mm rotor with lockring is 153 grams.