Quieter control for any terrain. With a focus on decreasing disc brake rotor heat deformation, the result of the new disc brake rotor is quieter than ever brake performance without sacrificing weight or heat dissipation. FEATURES: Quieter than ever, but with superb, consistent braking performance on any long, steep descents thanks to excellent heat dissipation The new arm shape is more robust, leading to quieter operation Heat dissipation paint boosts performance Disc brake rotor size: 140 mm, 160 mm, 180 mm, 203 mm