Sram: True competitors are always looking for a performance advantage — a relentless pursuit of equipment that is lighter, stiffer, stronger and more durable. To create the best drivetrain possible, we re-examined and re-engineered our crankset design. Our all-new XX1 Eagle™ CARBON TUNED™ crankset is our lightest, stiffest and strongest to date. 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.THINGS TO REMEMBERChainrings not included SPECIFICATIONSSpeeds: 12BB Compatibility: DUB:BSA73, PF89.5, PF92, PF30 MTB73, BB30 MTB73, BSA MTB68SPChainring Size: No ringsCrank arm length: 165mm, 170mm, 175mmChainline: n/aBB Spindle Interface: DUBChainring material: No ringsGuard: No GuardBolt Circle Diameter (BCD): Direct Mount (DM)Crank arm material: CarbonColor (Crank arm): Natural carbon