True competitors are always looking for a performance advantagemdasha relentless pursuit of equipment that is lighter stiffer and stronger to create the best drivetrain possible sram started with a completely reengineered crankset design the all new sram xx1 eagle crankset is the lightest stiffest and strongest on the market a special hollow internal architecture combined with a proprietary carbon tuned lay up allows us to build a lightweight and ultra energy efficient cranks