Shimano Dura-Ace 9000 Cog - Built In Spacer Type, 11T Shimano Small Parts Road Bike Dura-Ace 9000 11-Speed Small Replacement Part for: Shimano CS-9000 Sprocket Wheel 11T (Built In Spacer Type) FOR 11-23T,11 Used as part of Shimano Bike Parts; Dura-Ace 9000 11-Speed