Shimano XT RT 81 Ice Tech CenterLock Disc Brake Rotor 180mm. Take your stopping power to a whole new level with these sick new rotors. They use Ice Technology to give you 25% more braking power. The 3 layer Ice Tech rotor has an aluminum core between stainless steel for the ultimate combination of weight savings and heat radiation. These rotors run significantly cooler than the old all steel rotors, providing more consistent braking power, less noise and longer pad life.
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