Shimano Dura Ace CS 9000 11 Speed Cassette. Shimano has got the 11 speed gig nailed. They've thought of absolutely everything when it comes to optimizing performance. And that includes their superbly awesome CS 9000 cassette. Available in a range of options, including the wide range 11 28 version, the CS 9000 cassette is Rider Tuned with close ratio gearing to deliver crisp, smooth shifts for every rider, every time. Not only that, it's lighter than ever and takes advantage of both carbon and titanium to cut weight to an absolute minimum with no compromise in performance.