The new Dura Ace from Shimano is the answer to the question many professionals and ambitious amateurs have about whether and how the already immensely high level of performance can be further enhanced. Each individual Dura Ace R9100 component is designed to work as efficiently as possible with all other components of the system. This clearly demonstrates the core of Shimano's philosophy of system-developed components. The result is called System Supremacy - the superiority of the system over the sum of its parts. With the new, rider-adjustable cassette sprockets from Shimano, the Dura Ace R9100 allows for gear combinations that can be tailored to your riding style and the terrain of your choice. The new lightweight 11-speed cassettes are available in various sprocket combinations. Fast, precise, and smooth shifting in all situations is guaranteed. • Application: Derailleur system • Type: Sprocket cassette • Design: Sprocket unit • Number of speeds: 3.