Yes, that's how I measured the circumference of exactly 84" or 2133.6mm. The Bolt is calibrated to 2136mm, so that explains 0.2% of the 5% difference. The overread on the Bolt is rather consistent compared to GPS and by a fairly wide margin -- about 1 mph. Makes me question if the speed sensor is correctly calibrated.
Originally Posted by
woodcraft
Did you do a roll-out to measure the wheel circumference?
Just for kicks I tried wrapping a (fabric) tape around the tire, vs rolling out & it came out at least 1cm different.
I would get that dialed in, & then not worry about it. GPS does stuff like measure to the riverbed when you go over a bridge,
& Strava on a phone can include your trip into the bathroom- it's all an approximation.