SRAM Apex - Incompatible January 26, 2022 20:56 Updated The Apex has a concave channel on the inside of the crank arm that does not support our powermeters. Related articles Which Cranks are Compatible with 4iiii Powermeters? Incompatible Cranks - Master List Shimano GRX 600 Series PRECISION and Podiiiium Factory Install Crank Compatibility - Master List What is the Difference Between a Ride Ready and Factory Installed Powermeter?