DURA-ACE - 11-Speed - HG-EV - Road Cassette Sprocket Using a carbon fiber 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. FEATURES - Rider tuned gearing - Lightweight CFRP & Alloy spider arm, 5 titanium sprockets PRODUCT SPECIFICATIONS - MODEL NO CS-R9100 - SERIES DURA-ACE R9100 Series - Average weight 175 (11-25T) 193 (11-28T) 211 (11-30T) 189 (12-25T) 205 (12-28T) - Combination 11-12-13-14-15-16-17*-19*-21*-23*-25*T | 11-12-13-14-15-17-19*-21*-23*-25*-28*T | 11-12-13-14-15-17-19*-21*-24*-27*-30*T | 12-13-14-15-16-17-18*-19*-21*-23*-25*T | 12-13-14-15-16-17-19*-21*-23*-25*-28*T - Combination name (Group name) 11-25T 11-28T 11-30T 12-25T 12-28T - Type HG-EV - Compatible chain LINKGLIDE, HG 11-speed - Rear speeds 11 - Aluminum gear_QTY (pcs) 0 - Aluminum spider arm_QTY (pcs) 1 - Carbon spider arm_QTY (pcs) 1 - HG spline (ROAD 11-speed) - Steel gear_QTY (pcs) 6 - Titanium gear_QTY (pcs) 5