DURA-ACE CS-9100 11-Speed Road Cassette Using a carbon fibre and alloy spider and five titanium sprockets, the DURA-ACE R9100 cassette provides accurate shifting and light weight to the most discerning road cyclists on the planet. The Shimano CS-9100 Dura-Ace 11-Speed Cassette is a super lightweight 11-speed HG-EV cassette with a rigid carbon and alloy carrier for excellent shifting even under the most demanding gear changes. Hyperglide EV sprockets have a computer designed tooth configuration with contoured shift gates, resulting in a crisp smooth shift even under load. The close ratio gearing allows a more efficient use of energy through finer cadence control. The Shimano CS-9100 Dura-Ace 11-Speed Cassette's largest sprockets are mounted on lightweight alloy and carbon carriers to reduce weight and the 5 largest sprockets are made from titanium to reduce weight without sacrificing strength. With weight saving drilling and a hard wearing nickel plating, the Shimano CS-9100 Dura-Ace 11-Speed Cassette will see you riding harder and faster for further than ever before. Features: Carbon carrier Titanium and alloy sprockets Cut and drilled design Nickel-plating Alloy cassette lockring For Super Narrow 11-speed HG-EV chains Average weight 175 grams for 11-25 tooth Ratio's 11-12-13-14-15-16-17*-19*-21*-23*-25*T (11-25T) 11-12-13-14-15-17-19*-21*-23*-25*-28*T (11-25T) 11-12-13-14-15-17-19*-21*-24*-27*-30*T (11-30t) 12-13-14-15-16-17-18*-19*-21*-23*-25*T (12-25T) 12-13-14-15-16-17-19*-21*-23*-25*-28*T (12-28T) Click here for a compatible 11 speed chain: Shimano 105 5800 / SLX M7000 CN-HG601 11-Speed Chain Genuine, brand new, boxed Shimano product - Biketart are an official UK Shimano stockist.