I don't have any bike tires inflated as low as 35 psi...

Anyway, what you should be able to do is measure "rollout", as it's called. Mark a point on the tire, ride it for ten revolutions of the wheel, measure the distance, then divide that distance by ten. That gives you your actual tire circumference while riding, taking into account the change in its shape due to rider weight.

I mentioned low PSI because it could be that the tires are deforming enough to change the riding circumference and induce error in the odometer. Imagine riding on a bare rim and how much smaller that is than a tire, then think of the difference between that and a tire inflated so hard that it doesn't deform at all -- a squishy-soft tire would be somewhere in between.