Shimano Dura-Ace 9100 11-Speed Cassette Dura-Ace 9100 represents the pinnacle of Shimano road componentry. The new lightweight titanium Shimano Dura-Ace 9100 11-Speed cassette delivers the same kind of flawless, pro-caliber performance associated with the Dura-Ace name. Available in various gear ratios including the new 11-30t version. If you can't settle for anything but the best, look no further than Dura-Ace. Smooth, positive shifting guaranteed. Features Rider tuned gearing Wider gear combination: 11-28T/12-28T/11-30T (new gear combination) Closer gear combination: 11-25T/12-25T Lightweight CFRP & Alloy spider arm, 5 titanium sprockets Gear combination: 11-25T, 11-28T, 11-30T (New gear combination), 12-25T, 12-28T Weight: tbd | Shimano | Dura-Ace Cs-R9100 Cassette 12-25T