I have a Power2Max NG Ego crankset which I’ve used for about 5 years mostly issue free. Recently, upon going back to indoor training, I started asking myself “why does this feel so hard” as is common.
This led to zeroing, which I honestly don’t do very often. I get huge swing in zero from about 500 to 1200 in the TR desktop app. I repeatedly zeroed about a dozen times and there doesn’t seem to be any obvious bell curve its more like a random number generator. I don’t seem to experience this when zeroing outdoors with the garmin head unit.
Has anyone had a similar experience or have suggestions? PM battery is about 65% and yes I’m unclipped with the freewheel stopped. Also, how substantial are these differences? What is 500 vs 1200 like in terms of watts at 90 rpm?
Whether it does or does not self-zero, I still question whether the results I’m getting when manually zeroing using the TR software are indicative of issues be they with the powermeter or the TR software.
I’ve had 3-4 or P2Ms and they have all done this is as well. I haven’t noticed a large difference in the RPE regardless of what value it throws back.
I can’t prove it, but I know that P2M returns data differently than many power meters. For the same speed and effort in a ride/race, I will have consistently much much lower numbers than others who are essentially the same as me. I have sort of narrowed it down to how often the unit samples data. This brings the power average way down for stochastic efforts.
It seems like you had a similar experience. What both of us experienced and which hasn’t been answered in either thread is:
how significant is the value in terms of watts (i.e. should I care)
if zeroed repeatedly why aren’t the resulting numbers more consistent
I know a zero is just a zero and there is no reason to “want” it to be in a certain range, but its unclear if the “true” zero is ~500 or ~1200 so how many times should I press the random number generator before I train?