Potentially a stupid question :).
I have a stages left arm power meter and a Hammer trainer. I’ve only ever used power-match, but i realized that when i look at the readings between the two, if I’m getting 175watts at the crank, i’m getting something like 140 from the trainer. That makes sense to me as the drivetrain will eat up wattage on the way to the trainer. Power-match makes this moot, because it reduces the resistance on the trainer until the crank-arm measurement hits the target.
My question is, how does it work without power match? Does the trainer estimate how much power would be lost to the average drivetrain and account for that? Otherwise, everything else being equal, people not using power match would be training at a higher wattage than they’re seeing. I’m certain some of you guys know the answer :). Thanks for indulging me.