i want to ask in the board before contacting Support!
normaly before a TR indoor training I calibrate my Vector 3 only in the Trainerroad app,
although I also record the training with my Edge 830 and do not calibrate there,
which should also be correct in principle.
However, I have often wondered that my L/R balance is not correct in the recorded activities in Garmin.
In particular, my right pedal is often recorded with + 10mm off-center, but my left is usually very centered.
Since I do my indoor training with a mirror, I think that I pedal very symmetrically.
Now I’ve made a try and calibrated the Vector 3 only on the Edge 830 and not in the TR App, totally strange, then the L/R balance is totally ok in the Garmin Activity!
Could it be that the TR app is performing a different calibration because TR also does not record L/R information and therefore the problem with the right pedal arises?
Sorry for my bad english, hope it’s understandable enough!
Are you connecting your V3s with ANT or Bluetooth?
on TR i use my Vectors via Bluetooth because Support told me, the connection is more stable with new Powermatch (i can confirm, no drop outs) and on my Garmin i connect them via ANT+ (without any probs and drop outs too).
L/R information (and all cycling dynamics data) is only transmitted over ANT+ for the pedals.
thats clear, i use V3 on Garmin with ANT+, but looks like it make a difference in calibration, if you calibrate it on TR via BLT or on Garmin with ANT+, mean, it is a different way of calibration then?
I have no idea if the calibration is different. I would suspect calibration through a Garmin device would be the preferred calibration protocol as they’re both Garmin devices. So long as you calibrate the same way every time, you’ll be comparing apples to apples, so I wouldn’t be too concerned about it, personally.
As for L/R and PCO, it’s not entirely clear how helpful or useful those metrics actually are, and I wouldn’t put much stock in trying to get a certain outcome. Most folks are uneven with L/R and have different offsets because bodies are not perfectly symmetrical. @Jonathan recently mentioned on the podcast that Keegan Swenson tried to correct his L/R balance and lost power and comfort as a result.
Instead, I’d use it for a while and look at the data after workouts to learn more about what is in the normal range for me. That way when it goes out of range, I can target mobility or strength to see if it brings me back to my baseline.
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That’s where I was going.
I have a similar setup in that I have V3s with a Kickr and either Win10 TR or Android. I calibrate my V3s on my Garmin 530 and then still calibrate them in TR. I have seen that the V3 ANT connection in TR will already show as ‘calibrated’ bringing forward that head unit calibration. The TR bluetooth will not - you need to do a separate calibration / zero offset.
Taking all that into account - calibrate at the head unit and then also calibrate in TR. Not promising anything but have a gut feeling that might help
Totally agree. As great as they appear, the fact that no one seems to have exploited these Garmin metrics says that they aren’t wholly understood as far as benefit or detriment. i have a large difference in PCO L/R but it isn’t (as far as I know) causing a power imbalance or, more importantly, introducing any injury
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Yes of course, I don’t want to change my L/R balance, I just wondered why my right pedal shows such extreme values.
But you’re right, calibrating a Garmin device only with a Garmin device sounds logical, you don’t know what Garmin has secretly changed in the log 
i will try this too (first ANT+ on Edge, then BLT on TR), will see what happens! 
thanks to both of you for the good input!
as i said, i use 2 mirrors for indoor rides, so you see really total good if you have a great disbalance or not, this are special mirrors of Ikea (looks like they are designed for indoor riding), i will post a photo tonight after my ride