SRAM Red 2x Power Meter Kit E1 Direct Mount

The SRAM Red 2x Power Meter Kit E1 Direct Mount builds the power meter directly into the chainring itself rather than bolting a separate spider between the crank arm and the rings. It's an 8-bolt direct mount kit designed for SRAM's Red AXS E1 cranksets, and the one-piece chainring design keeps the whole assembly stiffer than a bolted spider-and-ring setup while measuring power independently from each leg and reporting a true left/right balance rather than a single combined number. SRAM rates the system at +/-1.5% accuracy, with active temperature compensation built in so readings hold steady as the ride heats up through a long climb or cools off on a fast descent.

Calibration runs in the background through SRAM's MagicZero system, continuously rechecking itself as you ride instead of requiring a manual zero before every session. Data broadcasts over both ANT+ and Bluetooth simultaneously, so it can pair with a head unit and a phone app at the same time without switching modes. Power comes from a user-replaceable CR2032 battery rated for roughly 200 hours, which means swapping a coin cell instead of tracking down a charging cable mid-season. The chainrings themselves use SRAM's X-Range gearing, holding a consistent 13-tooth delta between the big and small ring across every available size — 46/33, 48/35, 50/37, 52/39, 54/41, and 56/43 — which keeps cadence steadier through front shifts than a wider tooth gap would allow.

Because this is the power meter version of SRAM's standard direct mount chainring rather than a separate spider that bolts between crank arm and ring, installation is a straightforward swap onto an existing Red AXS E1 crankset instead of a full crank replacement. RA Cycles carries the kit across all six chainring sizes. For riders already running Red AXS who want accurate, temperature-stable power data without touching their crank arms or bottom bracket, the Direct Mount kit is the simpler path to power than replacing the whole crankset.