Shimano HG710 12 Spd Road Cassette The Shimano 105 CS-R7100 12-Speed Cassette is a key component of the new 105 12-speed Di2 drivetrain. This cassete has an 11-34t range, delivering a low gear combination that lets riders take on steeper slopes with greater control. There is an optimized "sweet-spot" gear for maximum pedaling efficiency, and the new 105 cassette is compatible with 11 speed freehub bodies. The new Shimano 105 12 Speed di2 groupset brings the benefits of semi-wireless electronic drivetrains to their workhorse line of components. Pro level features are now available for every-day cyclists. Features: 12-speed 11-tooth small cog for optimal efficiency Optimized "sweet spot" gears for pedaling efficiency Compatible with 11-speed freehub bodies 11-34t gear range 7100 Series Featu