The Shimano SM-RT86 XT Ice Tech Disc Rotor incorporates Ice-Technologies cooling technology for constant performance. It has a coated disk blade; It has a 3-layer structure, made of stainless steel, aluminum, stainless steel. The blade design of this disc allows it to be mud repellent.Shimano SM-RT86 XT Ice Tech Disc Rotor Highlights-SM-RT86 Ice Tech rotors give excellent performance made from a stainless steel / alloy 3-layer sandwich construction that manages heat while ridingThe clad steel / alloy / steel rotor construction allows heat generated from braking to radiate quickly through the aluminium core achieving surface temperature drops of around 50 deg C. When used with Ice Tech pads surface temperatures can drop from around 400 to 300 deg C, this provides great improvements in performance all roundIce Tech rotors achieve long pad life, less noise and less fade due to improved heat dispersion6-bolt mounting systemRotor contact surface has been developed for excellent pad clearing and cooling which increases pad performance and lifeLarge forged alloy spider supports rotor surface, increasing rigidity and reducing weight