SRAM's lightest, stiffest, and most accurate integrated power meter and chainring combination is now even lighter with a new carbon crankarm construction. The SRAM power meter is accurate to +/-1.5% and is unaffected by temperature changes, and the consistent 13-tooth gap on the rings ensures fast and reliable shifting. Not only unbeatable on performance, our integrated chainrings also last an incredibly long time. 29 grams lighter than the previous generation The power meter is fully integrated into the chainring Ultra-light hollow carbon crank arms Measures power on both crank arms.