What makes the SRAM RED AXS E1 Power Meter Chainring Kit so accurate?

The SRAM RED AXS E1 Power Meter Chainring Kit builds Quarq power measurement directly into a one-piece chainring, delivering left and right leg power balance accurate to within +/-1.5% that holds steady through temperature and weather swings. Because the power meter is integrated into the rings rather than bolted to a separate spider, you get the lightest, stiffest, and most accurate package SRAM offers, with nothing extra to add weight or flex. A consistent 13-tooth delta across every chainring pair keeps front shifts crisp and smooths the cadence change when you move between rings.

This kit uses SRAM's Direct Mount interface and X-Range gearing for a wider, smoother gear progression that keeps you in the right gear more often. The unique chainring shape is lighter, stiffer, and more durable than previous generations, and the unit pairs straight into the AXS ecosystem for firmware updates, calibration, and data through the app. It is built for road racers and performance riders who want pro-level power data without compromising drivetrain stiffness or weight.