With an advanced three-part construction that prevents heat build-up, this Shimano Deore XT MT800 Disc Brake Rotor (Internal Lockring) will ensure you enjoy powerful, responsive and consistent braking ability as you attack tough road descents. Deore XT grade RT-MT800 Ice Tech rotors give excellent performance made from a stainless steel/alloy 3-layer sandwich construction that manages heat while riding. This design 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, it provides great improvements in performance all round.