Shimano 105 CS-R7100 cassette With the step of the Shimano 105 components to a 12-speed shifting system, the gear jumps of the cassette are also correspondingly smaller. Thus, the fine, revised gradation of the CS-R7100-12 sprocket set ensures not only optimal acceleration in all situations, but also excellent efficiency, so that no pedaling energy is lost. Even under maximum load, with the CS-R7100 faster shifting processes are possible, which at the same time feel so smooth that gear changes are hardly noticeable. With a ratio of 11 to 34 teeth, moreover, neither sprints on the flat nor steep climbs are a hurdle. In addition, the 12-speed cassette is also compatible with Shimanos previous 11-speed freewheel bodies.