Say goodbye to interrupted shifting and hello to a smooth and efficient ride with theShimano Dura-Ace CS-R9200 12-Speed Cassette.It’s suitable for climbs, sprints, and descents, as it has larger cogs that improve drivetrain efficiency and are compatible with both Shimano 11- and 12-speed freehub bodies. In addition, it features Hyperglide+ technology that maximizes efficiency in every gear and eliminates the need to back off while shifting, all while maintaining a lightweight design.