Shimano SLX SM-RT70 SS Brake Rotor 140mm Centerlock:

SLX disc brake rotors deliver powerful and consistent brake performance for all riding conditions. The Ice Technologies Freeza rotor significantly reduces heat build-up in the brake system to ensure consistently 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.