L/R bal., Torque Eff. and Power Smothness - metrics are skewed

What’s to say the Assioma's aren’t wrong and you have a slight imbalance but they just feel better?

It will be interesting to hear what Garmin say for sure.

for me the pedals say I’m inbalenced and I probably am and I definitely have a stronger leg.

I'm assuming that you are using the same head unit for recording data from both pedal sets.

Balance is not static and varies with load and rider fatigue so it is difficult to compare any of the metrics such as TE/PS and balance across rides.

What you can do is check the accuracy of both systems by performing a static torque test. This will tell you if all 4 pedals are working within their declared spec.

Are you using the same shoes/cleats on both sets of pedals? If so what is the Q factor and stack height of the Assioma duo?
Are you testing both sets of pedals on the same bike or are they on different bikes?

Everything is EXACTLY the same...

Thing is - that I'm recovering from a surgery (in right achillies / heel bone) back in Sept. 17 and I'm using the metrics to "validate" my recovery. I started out with just the V3 and was of course much to the left leg. First training with the V3 was on Nov. 29th. Metrics where L/R 59/41, TE 89/73, PS, 28/21. But slowly, as I got stronger and stronger, metrics came closer to fifty/fifty.

Yet it was impossible for me to reach the level I saw outside before I need surgery. My units throughout the last three years; P2M NG, Vector 2 and P2M type S. It's fair to say that most of 2017, I did ride with slightly imbalanced L/R - this was due to need of surgery. But before that need, I was always 50/50 or very close to...

Then after a battery change, the battery housing thing started. While the V3 was in for a check, I bought the Assioma's - just in case something would take time. To my suprise, after the first ride with the Assioma's, the values where very close to spot on..?! Another thing, this felt much more in line with own feel. What I feel is equal power with both legs, the Assioma's shows as 50/50. TE is still slightly off and PS is mostly 23/23 - so it's balanced.

Having done several direct A/B test - followed by each other - on the exact same setup - my conclusions are very clear. Either are the V3 wrong OR it's my feel, based on more than a 1000 hours of riding with a powermeter, and most current, the data coming from the Assioma's.

To me - I think you need to take a look at the metrics.

PS - I have not done a static test, since the pedals are mounted on an Kettler Indoor Ergometer.

PPS - the V3 are my 2. pair. The first pair got completly replaced.

There is no special mounting requirements for the pedals to perform a static torque test. As long as you know the mass of the test weight and the crank arm length you can perform the test on any set-up.

Unfortunately feel is not a great measure of power balance as the body has adapted to that condition. Feel may allow you to notice a change due to injury, but typical it would not allow you to tell what your normal balance state is.

I very much understand your point asking for facts.

It's just everytime I use V3, metrics are off compared to many hours of "old" data which in fact just happen to fit with what the Assioma's report.

Take it as an input - I'm not trying to say anyone is more accurate than the other. My point here is: that V3 is off compared to hours of "old" data. And of course is feel very subjective, yet I'm not a newbie and very keen on data quality.

Edit: I think there is a lot more in this than "just" do the static torque test. What if there actually is a software bug. It sounds to me like you don't consider that option. What data do you have to back up this?

Anyone else here with the picture? Could also be my 2. pair of pedals...

I'm not excluding the possibility of a software bug in either system, but rather suggesting that you confirm that both pedals are reading force correctly before either accepting the data they give as either true or false.

One thing you could do is to collect some data from both systems while doing some one legged drills. This should show balance and TE as being 100% for the one leg you are using.

Never mind anymore - I just sold my V3's.

fwiw, my Vector 3 correspond well to the Powertap P1 (left leg generally weaker and depending on exertion, position etc.) but unfortunately they stopped working completely after changing the batteries. Seems to be a common issue according to these forums and I‘ll probably have to send them back. ????

i just rode outdoors and my l/r balance is 48/52 sometimes its 50/50. indoors its the inverse where my left is more powerful. i think the v3 in an indoor trainer is skewy. maybe because the bike is stationary and doesnt flow like when you are outside. i wonder if its skewy also in a trainer like the Kinetic Rock and Roll.

For me the l/r distribution is the same outdoors and indoors (Tacx Neo). Does not seem logical that the Vector 3 should not be able to show correct balance indoors.