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I don't know what powermeter you are referring to, but crank based powermeters work by measuring strain in the crank arm. When you push on a pedal, you are notjust bending the crank arm in the main plane of the bike, but you are also twisting it. There is a chance that the powermeter manufacturer has created a stiffness profile of the crank in question and loaded that into the firmware of the device.
What is the calibration method they suggest? If they don't know the stiffness of the crank you are mounting it on, it will be quite a difficult thing to do at home. -
It means the box contains a new left crank arm of that type with a power meter module already bonded to it and calibrated.
I've never seen the module sold separately.
chiroshi
grams
@deleted