Shimano RT-CL900 Disc Brake Rotor with Lock Ring

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.

• 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