Everyone loves the bling of XX1 Eagle but X01 is the kit of choice for those who race enduro or ride rugged terrain. The new updates to the AXS lineup include a more robust XO1 rear derailleur. This updated mech has a 10mm shorter cage than its mechanical counterpart, to avoid dragging it on rocks, sits further inboard, and provides a tighter chain wrap around the cassette. See more at SRAM.