SRAM XX1 Eagle AXS Boost Crankset - 170mm 12-Speed 34t Direct Mount DUB Spindle Interface GraySRAM XX1 Eagle AXS Boost Crankset 170mm 12 Speed 34t Direct Mount DUB Spindle Interface Gray. The SRAM XX1 Eagle AXS Crankset is designed using SRAMs DUB interface and Carbon Tuned lay up technology for tough and aggressive XC riding. Carbon Tuned crank technology provides extreme stiffness and SRAMs lightest weight crankset SRAM DUB technology simplifies the relationship of the spindle to the bottom bracket for superior compatibility and durability