Product Condition The Ultegra SM-RT800 Disc Rotor is in Like New condition Package to damaged to restock new item looks new unusedSize Unisex Centerlock 140mmColor GrayRetail Cost 5899Its hard to argue with the improves power and all-weather performance that disc brakes bring to road cycling Its a given in other cycling disciplines and we have already started to see some big names get important race victories aboard disc brake bikes Shimanos Ultegra SM-RT800 Disc Rotors feature Freeza technology to cope with the sustained braking and higher temps associated with road cycling This centerlock rotor continues Shimanos trickle-down technology from Dura Ace that further advances the Ultegra range Ice-Tech Frezza refers to the hybrid 3-layer sandwich construction of steel and aluminum The stainless steel adds durability and consistent braking at the surface while the aluminum drops weight and helps dissipate the heat that can build up on long technical descents by up to 50-degrees Fahrenheit When paired with Ice-Tech pads temps that would normally be in the 400-degree range operate at a much lower 300-degree number Lower temperatures improve braking performance and prevent fade for more confident descendingThe rotors are available in 140 and 160mm diameters and include a lockringUltegra SM-RT800 Disc Rotor DWGAKGB