Shimano RT86 Ice-Tech 6 Bolt Rotor Ice-Tech rotors offer improved performance by reducing temperatures (and hence brake fade) by 25%. Their sandwich design reduces the risk of warping. Shimano Ice-Tec rotors are made from a stainless steel / alloy 3-layer sandwich construction that dissipates heat faster. 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-Tec pads surface temperatures can drop from around 400 to 300 deg C. Ice-Tec rotors promise longer pad life, less noise and less fade due to improved heat dispersion. 6-bolt mounting system. Rotor contact surface has been developed for excellent pad clearing and cooling which increases pad performance and life. Large forged alloy spider supports rotor surface, increasing rigidity and reducing weight. Especially recommended for long downhills.