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The new Dura Ace from Shimano is answers the question of many pros and ambitious amateurs as to whether and how the current, immensely high level of performance could be further increased. Each individual Dura Ace R9100 component is designed to work as efficiently as possible with all other components of the system. This shows the core of Shimano's component-developed-as-a-system philosophy particularly clearly. The result is called SYSTEM SUPREMACY - the superiority of the system over the sum of the individual parts. Shimano's redesigned Dura Ace Center Lock brake disc is a component designed specifically for racing use and provides better dosage and feedback for added confidence. The new Dura Ace brake discs improve thermal management, i.e. the effective dissipation of heat generated during braking. They also ensure even more stable braking performance. The enlarged adapter between the brake surface and the cooling fins on the disc improves heat dissipation from the disc surface by a further 30 °C compared to the SM-RT99 ICE-TECH FREEZA brake discs. Center Lock brake disc mounts are not compatible with conventional 6-hole mounts.