When SRAM found ways to make their lightest and stiffest crank even lighter, they went for it. New construction technique drops further grams from the hollow carbon arms. Paired with an aerodynamic 1x chainring, this crank is ready to help you smash PRs. Plus they're offering more crankarm lengths than ever before to ensure this crank works for you.- Single-ring drivetrain simplifies functionality and reduces weight- Direct mount aero chainrings for better aerodynamics- X-Sync wide-tooth, narrow-tooth chainring technology provides maximum chain control- Ultra-light hollow carbon fiber crankarms are 29g lighter than previous generation- Can be upgraded to a power meter set up (Power Meter chainring sold separately)- DUB bottom bracket adds durability and simplicity (Sold separately)- 45mm Chainline