Ultegra CS-R8100 Series 12-Speed Cassette cadence/speed sensor Secure round base is compatible

Secure round base is compatible with most tubeless rims and a perfect fit for all Stan’s BST and BST-R rims

These can be individually cut to size and replaced

contoured at rear

Bottom bracket cups sold separately

there's no better way to treat them than with a pair of our Team SD Worx Road Socks

Ultegra CS-R8100 Series 12-Speed Cassette cadence/speed sensor Secure round base is compatibleThe uninterrupted shifting experience of the Shimano Ultegra CS R8100 12 speed cassette range lets you climb, sprint, or cruise without stopping to think about your next gear change. Larger driving cogs maximize drivetrain efficiency and create compatibility with both Shimano 11 and 12 speed freehub bodies. Shimano HYPERGLIDE+ technology is integrated to provide seamless shifts both up and down the gear range. Refined 12 step gear combination provides