Shimano ultegra rt800 ice tech freeza cl rotorwith its highly advanced construction and technologies, the ultegra rt800 cl centerlock hydraulic disc brake rotor shows that shimano is adding enhancements to its entire product range. Its constructed with an aluminium inner section and a durable steel braking surface that has shimanos ice tech freeza design. This lightweight and durable road bike brake disc brings you reliable performance and prevents heat build up on long descents, giving you fade free braking power.ride faster, brake laterthe ice tech freeza design provides constant braking performance through better energy control. Combined with shimano's ice tech freeza pads sold separately the disc's surface temperature drops rapidly when braking consistently at speed, which is a great improvement in braking performance and reliability over traditional brakes. This means you can leave the brakes until the last possible moment.featuresmaterial aluminium inner, steel braking surfacecompatibility shimano centerlock hubsmount type centerlockrecommended use roadbrake compatibility all shimano road bike disc brakesmanufacturer reference code smrt800ssweight 128 g 160 mm 108 g 140 mmtechnologies ice technologies freeza the power and precision of ice tech freeza are unmatched. With an increased surface area for heat dispersion, the ice tech freeza rotor has achieved the ultimate in heat control. A proven 50degc reduction in heat gives the user consistently powerful brakes for the duration of the ride, increases durability throughout the whole disc brake system, and provides longer pad life.a 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace and xtr products.buy shimano components from chain reaction cycles, the world's largest online bike store.