New Bike...virtual power Garmin speedsensor2

Hi All,

Longtime TR user, but…I got a new bike!

My power meter on my old bike is not compatible with my new bike so for the time being, I’ll be using virtual power. I’ve borrowed a Garmin Speed Sensor 2 from a friend and wondering if the sensor needs to be calibrated in order to provide the most accurate virtual power reading.

it would seem as if the virtual power calculation would need to know the wheel circumference, so calibration would be in order, but I can’t find any info on this.

Any help you can provide would be greatly appreciated.