When you need the absolute best from your training data, the pro-proven accuracy and reliability of the RED AXS power meter is undeniablePower readings are accurate within +/-1.5% and arent affected by climate conditions during a rideX-SYNC wide-tooth, narrow-tooth chainring technology provides maximum chain controlFully integrated power meter into a direct mount aero chainringAXS enabled for easy monitoring and firmware upgradesSingle-ring drivetrain simplifies functionalityDirect Mount52TBlack/Silver12spNarrow/WideUPC/EAN/GTIN: 710845904721