SRAM Crank Arm Assembly XX1 Eagle 55mm Chainline -175mmThe 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 SRAM MTB Wide DUB bottom brackets Not compatible with SRAM's 3 bolt direct mount interface Spider and