Shimano CS-R8101/8100 12-Speed Cassette Cog - 12t (E) Built In Spacer Type MFPN=SQ9810627 }Shimano Ultegra RD-R8000 Rear Derailleur

}Shimano Ultegra RD-R8000 Rear Derailleur Bracket Axle Unit

16t and lower are solid 17t and higher have cutouts

Double-butted tapered and shot-peened AL6061 construction

Bike display solution for even the heaviest of bikes – 40lbs (18kg) per cradle – 160lb (73kg) 4 – bike total

Slim low flange hub fully sealed

Shimano CS-R8101/8100 12-Speed Cassette Cog - 12t (E) Built In Spacer Type MFPN=SQ9810627 }Shimano Ultegra RD-R8000 Rear DerailleurShimano 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 Tooth Count 12 Cassette Body Type Shimano HG 11 12 Speed Road Drivetrain Speeds 12