Shimano SLX SM-RT70-SI Disc Brake Rotor - 160mm Center Lock SilverShimano SLX SM RT70 SI Disc Brake Rotor 160mm Center Lock Silver. Shimano SLX SM RT70 disc brake rotors deliver powerful and consistent brake performance for all riding conditions. The ICE TECHNOLOGIES rotor significantly reduces heat build up in the brake system to ensure consistent high performance braking even on the steepest downhill stretches. Shimanos center lock mounting system makes installing and removing rotors quick and easy thanks to the