Our lightest, stiffest, and most precise combination of power meter and chainring, preferred by our top professionals, is now even lighter thanks to a new carbon crank arm design. The SRAM power meter is accurate to +/- 1.5% and is not affected by temperature fluctuations. The consistent 13-tooth difference in the chainrings ensures fast and reliable shifting. Our integrated chainrings are also incredibly durable. Additionally, we offer more crank arm lengths than ever before to ensure that this crank fits you perfectly.