Its the ultimate in integrated power measurement - The RED AXS power meter kit adds Quarq technology to our one-piece chainrings for the lightest, stiffest, and most accurate power package available3-tooth delta on all chainring pairs ensures precise shifting for any setup, as well as a less dramatic change in cadence during front shiftsX-Range gearing technology gives you more range and a smoother gear progression, so youre always in the right gearPower readings are accurate within +/-1.5% and arent affected by climate conditions during a rideUnique chainring shape results in a lighter weight, stiffer, more durable unitPower meter is fully integrated into the chainring for lighter weightMeasures right and left leg power balanceCrisp and accurate front shiftsDirect Mount54/41TBlack/Silver12spStandardUPC/EAN/GTIN: 710845904776