I live in SoCal so rarely need to train indoors. Very lucky that way. I also HATE training indoors. For all the typical reasons. But I would like to train a little more indoors in order to be more efficient with my training time, work/family/bike balance, etc.
I have a KICKR and bought it for ERG mode. I want to set my power and forget it, just bang out 2x20s. For me though, it’s just a lot harder to maintain say 270W on the KICKR than it is outdoors. This is not due to the KICKR and my SRM being out of sync with each other, because when I say 270W I am talking about the readout from my SRM. As an aside, in order to get 270W on my SRM, I set the KICKR to 250W. Whether drivetrain losses or a varying power curve, it doesn’t matter to me. I prefer going off the SRM because that way I am reading power the same, whether outdoors or indoors.
I have the luxury of having a crank-based PM on both my road and TT bike, and they seem to correspond well to each other (I could check with a PowerTap wheel but I feel pretty good about this assumption). So I don’t really need the KICKR as a power measurement device but rather as a power regulating device. And it does a great job of that - my SRM readings from ERG mode aren’t dead flat but pretty darn close.
Thing is, it seems like a real chore turning over the pedals in ERG mode. My hypothesis is that I am perhaps more of a “masher” and do not apply power evenly throughout the pedal stroke (I know, I know, I need to buy Powercranks, right?) and that ERG mode, by providing constant resistance throughout the pedal stroke, is making my legs work in a way they do not in actual riding out on the road. Don’t get me wrong, I think I have a decent pedal stroke, but I do use Q-rings and think I take advantage of momentum and the assistance with the dead spot.
So has anyone with a PM on their bike ditched their KICKR, Computrainer or other power-based trainer in favor of E-motion rollers + PM on the bike? Yes, if I go this route I lose the “set it and forget it” feature that is ERG mode, but if I can pedal more “naturally” (for me) and hit my numbers the old-fashioned way (monitoring and adjusting effort along the way), it seems it might be worth it.
Finally, I should note that I have used my KICKR <10 times, and only twice in the last year, so if there is some kind of adaptation period to ERG mode, I would be interested in hearing about that. Though it might not be particularly comforting for me since I ride indoors so infrequently.