Shimano Ice Technologies takes the innovative 3-layer clad rotor to the next level by adding radiator fins. The new SM-RT99 rotor is the most effective heat management rotor ever produced by Shimano. Additional 50°C decrease in operating temperatures over previous Ice Technology rotor, braking and performance benefits include 20% less brake fade, 20% increase in stopping power and 20% longer pad life, 3-layer clad rotor – steel / aluminum / steel 
 The center lock discs are not compatible with conventional disc rotor mount (6 holes System).

Weight: 105g (140mm) 126g (160mm) 131g (180mm) 174g (203g)