SRAM XX1 Eagle AXS 55CL Crank Arm Assembly - 175mm 8-Bolt Direct Mount DUB Spindle Interface 55mm Chainline GraySRAM XX1 Eagle AXS 55CL Crank Arm Assembly 175mm 8 Bolt Direct Mount DUB Spindle Interface 55mm Chainline Gray. The SRAM XX1 Eagle 55mm Chainline DUB crank arm assembly offers simplicity compatibility and durability in a Carbon Tuned package. 55mm chainline 174mm Q Factor DUB technology simplifies the relationship of the spindle to the bottom bracket 8 bolt crank interface is compatible with Quarq Dzero XX1 Eagle power meter spider Compatible with all