Xtr sm rt99 ice tech rotors providing consistent braking performance through energy control using revolutionary stainless steel alloy 3 layer sandwich construction that manages heat while riding the 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 impro