Shimano XT RT86 6-Bolt Disc Rotors Aluminum spiderIncludes rotor fixing bolts and non-turn washers3-layer structure with aluminum core and two stainless steel outer layers reduces rotor surface temperature approximately 100 degrees Celsius compared to all-steel rotors Item SpecificationsWeight173Hub/Disc Compatibility6-Bolt DiscRotor Size203keyword searchSM RT86Rotor TypeTwo PiecePad CompatibilityAll Pad Compounds