It seems like it's from the future, but it's here now. The lightest, stiffest, and most accurate integrated power meter and chainring combination is now on the SRAM Force crankset. Quarq D-Zero technology is accurate to +/-1.5% and is not affected by temperature changes, and the consistent 13-tooth gap on the chainrings ensures fast and reliable shifting. The integrated rings are not only unbeatable in performance but also incredibly durable. The combination of these chainrings on our gray carbon crank arm also looks very stylish. X-Range gearing provides more range and a smoother progression. The unique shape of the chainring makes it even lighter, stiffer, and more durable. It measures the power balance between the left and right legs. It is an excellent choice for cyclists looking for a precise and reliable way to measure their power. Crank arm length 172.5mm chainring 48/35T X-range technology gives you more range and a smoother power transfer. Power meter is fully integrated into the chainring. Measurements are up to 1.5% accurate. Measures the balance between the left and right legs. Uniquely shaped chainring is lighter, stiffer, and lasts longer.