No, the Stages Power meter comes factory installed to a new left crank arm. It is not retrofitable, nor can it be user installed. We factory install Stages Power meters to each of the base crank arms we purchase from Cannondale, FSA, Shimano, and SRAM. Installation relies on industrial processes,adhesives, precision, and factory calibration. We do not accept customer crank arms for use in building power meters, this is not compatible with our manufacturing processes.