Performance Bike
Shimano CS-R8101/8100 12-Speed Cassette Cog (12t) (E) (Built In Spacer Type)
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From Performance Bike
Shimano replacement cogs for CS-R8101, CS-R8100 and CS-R9200 12-speed cassettes. Compatible with Shimano Ultegra CS-R8101, Ultegra CS-R8100, and Dura-Ace CS-R9200 cassettes Specifications Tooth Count 12 Cassette Body Type Shimano HG 11/12-Speed Road Drivetrain Speeds 12