Key Features:SMRT76 rotors give excellent performance using the 6-bolt mounting system,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 and cooling which increases pad performance and life,Large forged alloy spider supports rotor surface, increasing rigidity and reducing weight,Comes complete with mounting hardware,Average weight for 160 mm rotor is 138 grams.