Thats true, and Ill be reaching out soon to make sure of it.
While I agree the cadence is the most important data, what I get now is still sufficient. While the averages for the whole race are a little low due to the zeros, I still get the highs and lows of certain points in the race. Overlay that with power, and I can see what cadence I was at when it mattered. Did I feel under/over geared? Well I only hit X rpm in the attacks and final sprint, so looks like I was/wasn't and just being a cry baby. That said, at FCV we were limited to 88in (and I only cheated by 2in..
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My garmin is a little tired now and its possible the issue might be there. But I have a PT wheel for the road and have never had any of this.