I change the power reading to much lower than the previous bike I had on the trainer. I had a quick release 130 10 speed shimano road bike on the trainer. It would be consistent all the time. THen I put my 135 disc bike on the trainer and it is 11 speed shimano and the power reading went down. I found that a 5 mile stretch on the old bike in 20 minutes or 151 mph would read about 102 watts. Today the same ride on the new set up did yield 15 mph but only 88 watts. That seems wrong or something is. I calibrated the trainer through the tacx app but used my Garmin 945 in the freeride mode not the tacx app. But I have always done that way when I ride I rarely use the app in a power mode setting.