XTR SM-RT98 Ice-Tech rotors providing consistent braking performance through energy control, using revolutionary 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 dispersionRotors are durable lightweight and rigid, using the proven Shimano Centre-Lock system giving increased strength and security with an easy set-upPrecision cut and drilled braking surface improves pad clearing in muddy conditions while aiding cooling under high loadLarge alloy spider is a highly rigid and lightweight support for the rotor surfaceSuper polished braking surface gives excellent braking performanceAverage weight 126 g for 160 mm