More on the math: assume rim on a 26" tire is 81" and only a 20 deg F (more in line with my actual expeience) 81" * 20 deg * .00000645in / deg = .0104"
3500 * 81 / 81.0104 = 3,499.55 on recal
Calibration: 3,500.00 avg x 1.001 x 5.28 = 18,498.48 counts per mile
Recalibrate: 3,4999.55 avg x 1.001 x 5.28 = 18,496.10 counts per mile
This is very typically my experience with my airless insert. Cloudy day? I have to be careful where I set that axle on recal. Thank goodness for dehydration. Am I careful to sit up straight? If it looks close after first pass, you better believe it.