Dovetailing on a recent PowerTap G3 Hub debugging thread, I thought I’d throw my G3 issues out to the ST crowd in search of empathy/insight.
I’m noticing two problems and I’m guessing they are related. The first problem I noticed was, when analyzing my (G3 provided) cadence distribution, is an un-natural peak at 20 rpm, and no cadences between 0-20rpm:
The second problem I noticed, is that I sometimes observe a power reading while *coasting. *E.g. I’m descending, not pedaling and seeing (on my Garmin 920xt) a power reading anywhere between 10-200W (the cadence will be non-zero during this time too, often at 20rpm…). It’s not completely clear, but I think this “coasting power” is also getting added on top of the power registering when I am actually pedaling (i.e. If I see a coasting power of 100W, when I start pedaling at what I might guess is ~200W, I will observe ~300W being recorded).
A few answers to expected questions:
Firmware is updatedBatteries are newI’m calibrating before every ride and multiple times during the ride. The calibration seems to temporarily solve the problem, but after 10-15min, I see the “coasting power” come back. Checked that the quick-release was set properly (not too tight or loose)Auto-calibration: Enabled
Any thoughts / experiences / fix ideas before I get on the phone with my wheel-builder & PowerTap?