So I just bought a brand new 4iiii left only PM so I can continue my training outside.
I installed the PM and went for a ride. I was so excited to be outside finally that I crushed the ride. When I got back to look at the power data I noticed it seemed drastically lower than what I’ve been seeing inside in relation to my heart rate and RPE.
So the next day I decide to throw the bike back on the trainer (brand new Kickr Core) and simultaneously record the data for comparison. I set everything up, did the calibration, spin down, power smoothing off, 1sec recording on Garmin, etc, etc.
Sure enough after the 30 min ride the data from the 4iiii was significantly lower. It was showing approximately 20% lower than the Kickr Core. A little time on Google tells me that, assuming both meters are operating correctly, the Kickr would normally read a little lower due to drive train loss, and in general the power meters could be 4-5% out from each other anyways.
I have a email into 4iiii to see what they say. 20% low (ish) seems quite a bit off. Obviously its entirely possible that my Kickr is out too, in a perfect world I would have a third PM or another trainer to compare it against, but I don’t.
Anyways, I guess we’ll see what they say. Anyone else have similar experiences where the trainer was lower than the crank/pedals?