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 shifts for every 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%. This SRAM Red AXS Power Meter kit offers the ultimate in integrated power measurement, adding Quarq technology to the one-piece chainrings for the lightest, stiffest, and most accurate power package available. A 13-tooth step on all chainring combinations ensures precise shifting in any setup, as well as a less dramatic change in cadence during front shifting. X-Range gearing technology offers more range and smoother gear progression. Power meter is fully integrated into the chainring for lower weight. Power measurements are accurate within +/-1.5% and are unaffected by weather conditions. Measures right and left leg power balance. For crisp and accurate front shifting. Unique chainring shape results in a lighter, stiffer, more durable unit. SRAM Article number: 735579 EAN code: 710845904769 Supplier number: 00.3018.387.003 Retail packaging: Yes