The Shimano Dura-Ace 9100 drivetrain continues to serenade cyclists with its Rider-Tuned anthem. The Dura-Ace 9100 cassette was designed by Shimano based on direct rider feedback. Though the differences between the 9000 and 9100 cassettes are subtle, they’re significant. With the new additions to the Shimano Dura-Ace 9100 series comes the exciting inclusion of the 11/30T cassette, which is the largest cassette ever offered at a Dura-Ace level. Its expansion of gearing options and rigid tooth profile for incredibly smooth shifting are what set this cassette a part from others. Not only does it feature a CFRP and alloy spider arm, it also includes 5 titanium sprockets for lightweight performance. The 11/30T cassette also features a tool-free joining link for added convenience.Features: Tooth profile offers faster and smoother shifts Largest cassette ever offered at a Dura-Ace level 11-12-13-14-15-17-19-21-24-27-30T sprockets Tool-free joining link 5 titanium sprockets for lightweight performance