Every watt you generate deserves to be transmitted with total efficiency. 

X2 RD is the gear designed for those who demand the best: light, stiff, and able to transfer every watt with absolute precision.

The X2 RD R92 and the X2 RD R81 come from the same vision but specialize for different targets.

The first was specifically developed for Dura-Ace 9200 cranksets, offering the widest range with chainrings from 50 to 56 teeth (50, 52, 54, 55, 56). The second is developed for Ultegra 8100 cranksets with three targeted configurations: 50, 52, and 54 teeth, maintaining the same construction philosophy.

Both are compatible with Miche R12 internal gears as well as original Shimano ones, offering different setups for every need.