Power Meters / Powermeters (SRM, Powertap, Quarq, Ergomo, Vector, Stages, power2max, P2M, 4iii, InPower, Cinch)

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pifko in reply to @Dammit

Was the bike itself at ambient temperature when you zeroed it? If it’d come out of the car the cranks and so forth may have still been warmer than when it reached the roundabout

This might be it, and thinking about it, I haven't raced on this bike since Sept-19, and 'MagicZero' was in the version 10 (Jul-19) firmware. I didn't update until Oct-20, and all sessions since update have been on the turbo at ambient temps.

Whichever way round it was, it’s annoying. Could you apply a correction factor to the pre-roundabout power, so your records are accurate?

Good question, @Greenbank might know - Does a Garmin store the zero-offset number during an activity?

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Greenbank in reply to @pifko

Good question, @Greenbank might know - Does a Garmin store the zero-offset number during an activity?

No idea, but there's a boat load of stuff stored in a .fit file that isn't documented. If it's a .tcx file then I think the answer is no.

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zmjones_ in reply to @Greenbank

this would really be an intriguing possibility. i have been thinking about writing some software which attempts to make power meters a bit more comparable and easier to do historical reviews of your data and that'd be invaluable. you could maybe smooth the offset over time to adjust data, model l/r imbalance and apply that to single sided power meters, use tests of pms to estimate variance of pms by manufacturer, etc. plus you could estimate uncertainty for all of this so you could see if your data were significantly changing

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