Shimano Ultegra CS-R8101 12-Speed Cassette

New tooth profile designed to work with both electronic and mechanical Shimano drivetrains. Tooth profile slightly changed to better accomodate mechanical shifting

• For Di2 and Mechanical Shifting Systems
• Refined 12 step gear combination provides peak efficiency and accelerating performance for every racing situation
• Faster, smoother shifts under maximum pedaling force
• Compatible with new 12-speed (HG-Spline-L2) and road 11-speed (HG-11) freehub bodies
• Cassette Body Type: Shimano HG-Spline-L2
• Drivetrain Speeds: 12
• Range: choose; 11-30t, or 11-34t
• Weight: 291g. (11-30t); 345g. (11-34t)
• Color: Silver