Adding power measurement to a SRAM Red XPLR AXS build without replacing the whole crankset is what this piece is for. The Red XPLR E1 AXS Power Meter Spider from SRAM bolts into the 8-bolt direct mount interface between your crank arms and chainring, using strain gauges at the spider arms to read torque from both legs. Because it is a spider-based power meter, it measures power from both legs in addition to providing left and right leg power balance data.

SRAM built this around removable Thread Mount chainrings, and with dual-sided power measurement, readings stay accurate within +/-1.5%. The Thread Mount design is available in 38T-46T, which covers the range most gravel riders end up running for mixed-terrain work. Swapping between a 40T for punchier terrain and a 44T for faster gravel racing is a matter of unthreading one ring and threading on another — no need to pull the crank arms.

Power readings are accurate within +/-1.5% and aren't affected by climate conditions during a ride, and the user-replaceable CR2032 battery delivers 200 hours of battery life. MagicZero automatically checks and recalibrates the power meter during rides, and 10K temperature compensation keeps accuracy consistent as conditions change. An IPX7 waterproof rating means the unit is resistant to immersion up to 1 meter for 30 minutes, which matters if you ride through creek crossings or get caught in weather.... Read More