Shimano released their 12-Speed groupsets with a recommendation that the RT-MT800/900 rotors where the compatible options for XT, XTR, Ultegra and Dura-Ace, but the engineers at Shimano and their partners at ICE Technologies were still working on a new road-oriented version. Still acceptable for XC mountain use, and more than a match for gravel or road the Ultegra level RT-CL800 Center Lock Disc Rotor has advanced design features and enhanced ICE Tech features that keep the rotor even cooler, quieter and more efficient. Using ICE Tech designed finned brake pads, and the RT-CL800 rotor, the road hydraulic disc brake experience has been taken to another level.

With a focus on decreasing disc brake rotor heat deformation, the new disc brake rotor is quieter than ever and delivers brake performance without sacrificing weight or heat dissipation. The sandwich-type braking ring of the rotor: stainless steel, aluminum, and stainless steel, carries over but with a new directional and symmetrical fin design for a more consistent feel, and cooling action. The anodized aluminum spider has a new arm shape that is more robust, leading to quieter operation overall, without adding weight. The spider mounts to the ICE Tech Freeza cooling radiator system, further reducing heat build up. The cooler unit overall makes for more confident descending, lessens risk of rotor warping, and maximizes disc brake pad life while delivering better overall power, feel and modulation when used with R8170 Dual Control levers and R8170 disc calipers equipped with ICE Tech disc brake pads.