The saint rt99 2013 ice tech centre lock rotor from shimano are designed to provide consistent braking performance this is done by energy control using a revolutionary stainless steel and alloy 3 layer sandwich construction that manages heat while riding the clad steelalloysteel rotor construction allows heat generated from braking to radiate quickly through the aluminium core achieving surface temperature drops of around 50 degree c when used with ice tech pads surface temperatures can dr