Shimano XT RT81 IceTech Disc Brake Rotor Centerlock

XT components set a whole new standard for MTB excellence. XT offers efficient power transfer, highly-responsive braking and all-around superior performance. Toughness and reliability on the hardest trails. 

• Aluminum core and two stainless steel outer layers reduce surface temperature.
• Aluminum spider
• Includes standard type rotor lockring
• Requires external-type rotor lockring when installing onto 15/20mm axle hub