The Shimano Ultegra SM-RT800 Ice-Tech Freeza Centerlock brake discs with sandwich structure (stainless steel - aluminium - stainless steel) offer an effective heat management while braking what results in unparalleled braking performance and reliability in the most demanding conditions. Optional Ice-Tech brake pads with aluminum cooling fins can reduce the brake pad surface temperature further. The results are high stopping power and practically no signs of fading. Compatible to resin and metal brake pads. Available with 140 and 160 mm diameter.