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"How our calibration works is, we send a signal to the trainer, telling to to calibrate, and then it will send another signal to us indicating whether or not the calibration was successful, and that's what we display in the app. As long as the calibration is shown as successful, I would say you're good to go. :)
That being said, if you wanted to, you could also calibrate the Kickr in Wahoo's Utility App. This app might give you more metrics for the calibration. So that you know, if you calibrate the trainer in another app, this calibration will carry over to TrainerRoad automatically, because the data is stored on the trainer itself."
So this is why they don't send back a number.
KICKR is the same. I don't want to change anything I just want to see if a number changes when I do calibrate. If nothing changes, why calibrate, if it changes then maybe I'll calibrate more often, that kind of thing.