Hi!
I have recently noticed that on Trainingpeaks, the Left/Right power balance seems to be flipped.
I’m recording data on a 4iiii, left side power crank. So, I would have thought that the data should be 100%/0%. However, it seems to be the other way round.
Is there a simple explanation to this which I am missing?
Thanks
It’s probably just written as right/left, and not left/right. The writing order doesn’t have to represent the way things are mounted on the bike.
That does appear like it would be the obvious answer. Although, it still seems like an odd choice. Seeing as I’ve always heard it expressed as Left/Right power balance, it’s unusual that Trainingpeaks would have decided to display it as Right/Left.
I also have a 4iiii left side PM. When I look at the power recorded with the Wahoo Bolt it also says 100% right. Nothing to be worried about, it’s just a bit strange.
I also have a 4iiii left side PM and according to my last TP ride I’m 0.11%left sided/ 99.9% right sided 
I’m always 80/20. Good to know there’s an extra 20% that I’m somehow not getting out of my left leg
All very interesting! So, is everyone saying that the left/right ‘flip’ is coming from the 4iiii? For instance, if I was to use a pair of Assioma Duo pedals, would trainingpeaks display power balance as Left/Right, in that order?
No. TP have just formatted the field so that it shows right/left power. Probably because we tend to write from right to left, and saying right first is normal.
L/R power balance is displayed as Left/Right across most if not all platforms, by convention. In the background the balance values are between 0 and 1, where 0 = 100/0, 1 = 0/100. I know this is the case for TP, and I don’t think any other platform is swapping that order.
I have dual- and left-only 4iiii power meters. And yeah, the left-only shows 0/100 for some reason. Maybe it just defaults to sending a ‘1’ when only one side is present? Maybe it’s related to pedal smoothness or torque effectiveness, or some other correction factor, which could explain why it’s not always == 0/100?
Other L-only power meters don’t show any balance values at all. So I believe it’s something on 4iiii’s end. Either way, it’s meaningless. As far as I’m aware, you will always end up with a flat 2x the power number measured on the left side.
TP is definitely formatted Left/Right. I have Assioma Duos and the TP data matches Garmin Connect data.
When I ride on Zwift, which is recording power from my Kickr (I.e. no L/R balance data) TP does not show a L/R breakdown at all. It’s not just blank, there is no balance field displayed for those rides.
So, whatever is showing up in TP is coming from the power meter.
You tend to write from right to left?
To complicate it further; my Favero Be Pro S (single sided) doesn’t give me any balance in TP just the single sided 4iiii.
(The Be Pro S does give a power balance in GC however (or what Garmin call a Torque Effectiveness anyway), its usually 90R/0L for me 
)
Torque effectiveness is different from power balance
Ummm…the other right and the other left!
Yeah, I just tried to find out how it looks for me, but I don’t have a power balance field on TP with a single-sided PM.
So if it’s not a case of simple formatting, maybe the PM is paired as a dual sided PM, despite only being single sided, and the right side would get paired first?
