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Powertap G3 Calibration with Garmin Edge 530. Are negative numbers now the expected result?
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I own several wheels with PowerTap G3 power meters. When I calibrate them successfully with my Garmin Edge 530 they give me some meaningless result number that's something like 500-600 or vaguely in that range.

Recently I just bought a brand new wheelset with a new G3. For this one, whenever I calibrate it, returns a number that appears to range from -1 to -9. It seems random. I'll get -3, then -5, then -8

But it says "Calibration Successful". And when I switch to the normal display, it returns power numbers that look reasonable.

So is this some relatively recent change to G3 stuff? That they return negative numbers when you succeed?
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Re: Powertap G3 Calibration with Garmin Edge 530. Are negative numbers now the expected result? [JoeO] [ In reply to ]
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Hi JoeO:

With the firmware 16.063 version (2017) the torque offset range is no longer 500-524. This new limit is +/- 30 Nm for ANT+ and +/- 3.0 Nm for BLE.
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Re: Powertap G3 Calibration with Garmin Edge 530. Are negative numbers now the expected result? [JoeO] [ In reply to ]
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Your readings sound about right and similar to what I get.
Mine are around the -6 mark and will vary slightly with temperature: colder goes out to about -12 when very cold and warmer temperatures go the other way.
I’ll typically do two or three calibrations, one after the other,but the readings only vary by 1 or 2 either way.
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Re: Powertap G3 Calibration with Garmin Edge 530. Are negative numbers now the expected result? [ezeocampo] [ In reply to ]
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Ah great. Good to know. Thanks
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Re: Powertap G3 Calibration with Garmin Edge 530. Are negative numbers now the expected result? [JoeO] [ In reply to ]
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Coincidently my original G3 shit the bed recently and I sent it in for an overhaul. Just got the wheel back and installed yesterday. Very first calibration was -5 and I had the very same question.
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