SRAM's lightest, stiffest, and most accurate integrated power meter crankset just got lighter with a new carbon crankarm construction. The SRAM power meter is accurate to +/-1.5% and isn’t affected by temperature changes, and the direct mount X-Sync chainring is aerodynamic and incredibly long-lasting. Plus they're offering more crankarm lengths than ever before to ensure this crank works for you. Power meter is fully integrated into the chainring for lighter weight and greater accuracy. Power readings are accurate within +/-1.5% and aren’t affected by climate conditions during a ride. Measures right and left leg power balance. 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. DUB bottom bracket adds durability and simplicity (Sold separately). 45mm Chainline.