I use a Tacx Flow Smart with a cheap MTB (28 gears) and during workouts at the warm up or recovery phase, it’s almost impossible for me to keep a low wattage (70 or something).
If I want to produce 65 or 70 watts I’d have to pedal at 25-30 rpm, maybe less. If I’m at 64-70 rpm the wattage will be the double of what it should be.
In another hand, I have no problem to get 150-180 watts at 80rpm during the workout itself.
Is it normal? Is it because during warm up the ERG mode is off and I have to shift? Am I doing something wrong?