Shimano Ultegra CS-R8100 12-Speed Cassette

Larger driving cogs maximize drivetrain efficiency and are compatible with both Shimano 11- and 12-speed FREEHUB bodies
HYPERGLIDE+ revolutionizes off-road shifting with its seamless shifts up and down the gear range
Refined 12-step gear combination provides peak efficiency and accelerating performance for every racing situation
Faster, smoother shifts under maximum pedaling force
Cassette cogs: 11–30 T: 11-12-13-14-15-16-17-19-21-24-27-30; 11–34 T: 11-12-13-14-15-17-19-21-24-27-30-34