The choice of top professionals for the Quarq SRAM RED AXS E1 the lightest stiffest and most accurate integrated power meter and chainring combo just got lighter with a new carbon crankarm construction. The SRAM-integrated power meter is accurate to -1.5 and isn’t affected by temperature changes. The consistent 13-tooth gap on the rings ensures fast and reliable shifting. Plus SRAM offering more crankarm lengths than ever before to ensure this crank works for you.