The SHIMANO DURA-ACE CS-R9100 11-Speed cassette provides accurate shifting and light weight. Using a carbon fibre and alloy spider and five titanium sprockets, it is ideal for discerning road cyclists. Hyperglide EV sprockets have a computer-designed tooth configuration with contoured shift gates, resulting in crisp, smooth shifts even under load. Close-ratio gearing allows for more efficient energy use through finer cadence control. The largest sprockets are mounted on lightweight alloy and carbon carriers to reduce weight and increase rigidity. Five largest sprockets are made from titanium to reduce weight without sacrificing strength.