Shimano Dura Ace CS-9000 Cassette 11-speed 11/25T 03001513

Dura-Ace 9000 is a completely new groupset for 2013. It includes Shimano's lightest, most ergonomic, and most precise road cycling components. In addition to providing the highest quality mechanical performance, Dura-Ace 9000 serves as the foundation for Shimano's revolutionary electronic shifting technology, Dura-Ace Di2. The additional 11th gear and numerous other improvements are combined to give you true dominance on the road. When you ride with Dura-Ace cycling components, you ride to win!