The pinnacle in mountain bike braking, Shimano RT-MT905 XTR Ice Tech Disc Rotor delivers superb stopping power for the most aggressive riding. The ICE TECHNOLOGIES FREEZA rotors dissipate heat to maintain braking performance on long downhill stretches.Shimano RT-MT905 XTR Ice Tech Disc Rotor Highlights-RT-MT905 Ice Tech FREEZA 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