That 0.8% difference is likely closer than if both units only used GPS only for distance, no wheel sensors. Maybe not with a clear sky signal, but forests, buildings, etc, can throw off the calculated position quite a bit.
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The Garmin shows the auto calculated wheel size in the menu. "hamburger menu icon" --> sensors --> select the wheel sensor --> sensor details. It only shows the wheel size when the sensor is active.
It would be interesting to see how often this changes during a ride. It should stay at the same value, but I'm guessing it drifts a little.
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That 0.8% discrepancy between the Bolt and Garmin would be about 16mm for my 2093 wheel size.
Last edited by rm -rf; 12-12-21 at 09:36 AM.