This is the ultimate in integrated power measurement. The RED AXS power meter kit adds Quarq technology to our RED chainrings for the lightest, stiffest and most accurate power meter available. A 13-tooth difference on all chainrings ensures precise shifting for any configuration, as well as a less dramatic change in cadence during front shifts. Combined with our most durable chainrings ever, it's an unbeatable combination. The power meter is fully integrated into the chainring. Measures power on both crank arms. Highly accurate with a tolerance of just 1.5%. For riders who want to get the very best out of their training, the proven accuracy and reliability of the RED AXS power meter is the right choice. Integrated into the chainring itself, it is light, stiff, and aero. The power meter also offers high accuracy up to +/-1.5%, even when weather conditions change. Single setup simplifies functionality. Fully integrated power meter in a direct mount aero chainring. Power readings are accurate within +/-1.5% and are unaffected by weather conditions. X-SYNC wide-narrow tooth chainring technology provides maximum chain control. SRAM Article Number: 735582 EAN Code: 710845904707 Supplier Number: 00.3018.386.000 Retail packaging: Yes