1H SHIMANO STEPS - CENTER LOCK - Disc Brake Rotor - ICE TECHNOLOGIES FREEZA - Speed Sensor System - 203/180/160 mm SHIMANO RT-EM810 disc brake rotors for speed sensor systems deliver powerful and consistent brake performance in all riding conditions. The ICE TECHNOLOGIES FREEZA rotor significantly reduces heat build-up in the brake system to ensure consistent high performance braking even on the steepest downhill stretches. SHIMANO's CENTER LOCK mounting system makes installing and removing rotors quick and easy thanks to the spine mount and lock ring design. 1209xxx(186-188)8/8 4/2525(1:4/28ar 73125(1:8/1ar