SHIMANO - 6-Bolt Type - Disc Brake Rotor - ICE TECHNOLOGIES FREEZA - 203/180 mm The pinnacle in mountain bike braking, XTR RT-MT905 disc brake rotors deliver superb stopping power for the most aggressive riding. The ICE TECHNOLOGIES FREEZA rotors dissipate heat to maintain braking performance on long downhill stretches. FEATURES Delivering superb stopping power, consistency, and control for peak performance in the most challenging riding conditions Ultimate heat reduction of ICE TECHNOLOGIES FREEZA rotor construction combined with special heat dissipation paint Dramatically lower surface temperature improves braking performance and consistency (less fade) while reducing system noise and extending pad life 203 mm RT-MT905 operates 100C cooler compared with a 220 mm stainless steel disc brake rotor under the most extreme conditions with a more compact design