Shimano XT RT81S 160mm Centerlock IceTech Disc Brake Rotor
Shimano XT RT81 Centerlock Disc Rotors 3-layer structure with aluminum core and two stainless steel outer layers reduces rotor surface temperature approximately 100 degrees Celsius compared to all-steel rotors Aluminum spider Includes standard type rotor lockring Requires external-type rotor lockring when installing onto 15/20mm axle hub