All of our single sided powermeters have the capability to compensate for L/R leg imbalance using the scale factor feature in the 4iiii App. When you are connected to your powermeter in the 4iiii App, navigate to the “Device Settings” screen.

It uses the following logic to make the calculation:

1/(1 + percentage of error ) = Scale Factor

i.e. an variance of 4% would calculated as:

1 divided by 1.04 = 0.962

Output power = Scalefactor * (left leg * 2)

Say you have a left/right power imbalance of 48/52

Left power = 48%

Right Power = 52%

Percentage error = 52 - 48 = 4%

The calculation will be: 1/(1+4) = 0.962

Then since your left leg is lower and the power is measured from the left leg, you need 1/0.962 = 1.042 The scale factor that you would then need to enter into the App is 1.042.

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