The Shimano RT-MT905 6-bolt type disc brake rotors deliver superb stopping power for the most aggressive riding. The ICE technologies, combined with FREEZA disc brake rotor construction, rapidly dissipates heat for more consistent braking performance.Features-Delivers superb stopping power, consistency, and control for peak performance in the most challenging riding conditions-Dramatically lowers surface temperature to improve braking performance and consistency (less fade), while reducing system noise and extending pad life-Operates significantly cooler compared to stainless steel disc brake rotors under the most extreme conditionsItem Specifications-Rotor Size (mm):180-Hub/Disc Compatibility:6-Bolt