650 CC wheel speed


I have a client using a cyclops fluid2 trainer & wahoo speed sensor. The bike has 650cc wheels. We believe that the correct wheel size is configured correctly during the speed sensor pairing process.

However, the p/w results in Zwift appear very above norm. Does anyone have a recommended approach for validating if the setup actually correct?

My thought is have them hold a specific speed on the trainer (externally measured on a Garmin head unit) & then match that trainer speed to estimated power in Zwift. Is a Zwift power curve to trainer speed chart available for comparison purposes?

I cant help feeling that Zwift still thinks it is measuring a 700 cc wheel and is giving them extra power credit as a result. I would like to validate this theory.

Thanks much.