With a focus on decreasing disc brake rotor heat deformation, the result of the new Dura-Ace CL900 Ice Tech Freeza Disc Rotor is quieter than ever brake performance without sacrificing weight or heat dissipation.Dura-Ace grade RT-CL900 Ice Tech rotors providing consistent braking performance through energy control, using revolutionary stainless steel / alloy 3-layer sandwich construction that manages heat while ridingThe 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 Tech pads surface temperatures can drop from around 400 to 300 deg C, this provides great improvements in performance all roundFreeza rotors allow the alloy core to extend out from the braking surface as a fin to providing added coolingIce Tech rotors achieve long pad life, less noise and less fade due to improved heat dispersionRotors are durable lightweight and rigid,