Good morning Hubland, This is a very particular query I have, but humour me. I started training with power in approx January 2017 in preparation for the then LeTape Tour. I continued training with power using a Wattbike in my (then) local VA. The crowded atmosphere in the VA detracted me so I decided to go the smart trainer route. Having now used the smart trainer for some weeks I can categorically say that the Wattbike and (this particular) smart trainer are not the same. The most simple away to distinguish between the two is my RPE. Put even simpler - it feels easier to do a certain wattage on my smart trainer than it did on the Wattbike. My HR is an indication of that too. I am aware HR has a lot of variables including temperature, how well you slept, how well you ate, how hydrated you remain etc. etc. I only used the "fan" setting on the Wattbike, only the magnet on the rare occasion when I had to go 350W+ for LOW cadence. Is it at all fair to compare the two? Should I just discount all my training I did on the Wattbike (in excess of 2500km)? Am I actually doing myself a disservice by using a smart trainer? Just to answer some questions I know will appear - I never (re)calibrated the Wattbike for each session (no clue how that was even done) I hardly ever used the exact same Wattbike due to space issues at the VA I always calibrate before my ride on my IDT I use the same bike each time (on the IDT) with about 7 bar pressure I calibrate using the Tacx Utility App and TrainerRoad Thanks for reading!