Item DescriptionThe fulcrum of the 11-speed system. An absolute innovation11-speed parallelogram geometry operates with absolute precision Anodized die-cast lightened aluminum upper body and parallelogram link, which confers 150% greater torsional rigidity Updated black anodized alloy B-bolt assemblyLight alloy outer and inner cages with specially lightened anti-vibration pulleys for maximum smoothnessShort cage (55mm pulley-pulley axle dimensions) or medium+ cage (82mm pulley-pulley axle dimensions)Item Specificationsspeed: 11spcage: GS-medium+min/max: 11/29Tcapacity: 39Tweight: 216gcolor: silver: