Power meter vs. Smart Trainer power accuracy.

Anybody else use multiple power meters for power data in Xert? Ever bother to compare them? Here’s what I found with what used to be my 2 most used training platforms - a Tacx Vortex Smart and Stages single-sided crank based power meter. Pretty much useless for Xert.

I checked my Assioma pedals against my Elite Direto trainer a few times and they were pretty much identical.

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One thing to keep in mind is drivetrain loss. You will usually read 2-3% lower power at the hub/trainer compared to the pedals.

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Wheel-on trainers are notorious for false readings of power and the Vortex Smart has a claimed accuracy of ±10%.

Combine that with a single-sided power meter and a left-right balance possibly in favor of the right leg and drivetrain power loss this is pretty much expected discrepancy.

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The point I was making was that if you haven’t checked, you don’t know.

BTW, my LEFT leg is considerably stronger than my RIGHT. Is that what you meant?

I agree with that, and as you, my point was that you don’t really know what’s your correct numbers.

I guess leg strength can affect your balance. I checked my activities for the last three months and the average balance varies between 45/55 and 52/48 and my right leg is mainly the dominant one.