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Fluctuating PowerTap calibration number
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I've been finding the power numbers on my G3 hub have felt off, but not way off. When doing threshold intervals, it seems like it's +/- 20w.


The other symptom I've noticed is that everytime I stop to calibrate, I get a number from one of 2 narrow ranges. eg. If I calibrate 4 times on a ride, I might get calibration numbers of: 9,8,16,9, or 9,16,17,9, or 17,8,8,16, etc...
(if I calibrate multiple times in a row, then I get a consistent number, the number only changes randomly if I've ridden for a bit)


I also tried putting put a second power meter on the bike (C1 chainrings) to compare and they would often disagree. Sometimes the G3 would read higher, sometimes lower (usually somewhere in the +/-25 watt range)

To me it seems like there is something wrong with the power meter, but Saris is telling me that it's behaving fine. They say that if it's giving a calibration number between -30 and +30, then it's working fine. My understanding was that unless there was a substantial temperature change, I should be getting a consistent calibration number, is this wrong?


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Re: Fluctuating PowerTap calibration number [AngrySaki] [ In reply to ]
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How old is your battery? The CR2032 does not last long, like 3 months for me. I ride 3-4x a week.
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Re: Fluctuating PowerTap calibration number [AngrySaki] [ In reply to ]
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Wait, you are getting calibration numbers like 9, 8, 16, 9? I hope you mean 509, 508, 516, 509, right?

Whenever I calibrate my G3, those are the sorts of numbers I get. As I recall it's supposed to be something from 500 to 520
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Re: Fluctuating PowerTap calibration number [jdais] [ In reply to ]
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I've tried replacing it twice, but it unfortunately hasn't made a difference
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Re: Fluctuating PowerTap calibration number [JoeO] [ In reply to ]
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It used to read in those 500 ranges you are talking about, but I got it repaired last winter because it was giving me strange power numbers. During that process they had me load some newer firmware which changed the calibration range. (the numbers I'm getting now are usually between 5 and 20 depending on the temperature).
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Re: Fluctuating PowerTap calibration number [AngrySaki] [ In reply to ]
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