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Yes - speeds seem normal during training, when on Zwift maybe slightly higher than I would expect in the real world. Circumference is the default suggested by the app - 2070 I believe. I looked at the youtube video for calibration of Direto - my Direto does not have any similar place to adjust belt ...

I have had my Direto for about 18 months. In all that time I have been unable to calibrate it. I have tried multiple times with the Android myETraining app but the calibration always fails in the same way : "please start pedalling" - I do "pedal faster to hit the target speed of 33 km...