True competitors are always looking for a performance advantage a relentless pursuit of equipment that is lighter, stiffer, stronger and more durable. The all-new SRAM XX1 Eagle CARBON TUNED crankset is their lightest, stiffest and strongest to date. SRAM DUB technology enhances this by simplifying the relationship of the spindle to the bottom bracket, and redefining the measure of durability. DUB powered cranksets mean simplicity, compatibility and durability.