Shimano XT M771 10 speed 13t Cog for 11-32/36t Cassette Shimano Small Parts Mountain Bike Deore XT M770 9-Speed Small Replacement Part for: Shimano CS-M771 Sprocket Wheel 13T (Built In Spacer Type) FOR BJ/BK-GROU Used as part of Shimano Bike Parts; Deore XT M770 9-Speed