Are you suggesting, via corollary, that solid rubber tires also undergo an effective radius change, Mark? If so, do solid tires then offer any potential accuracy advantage?
I measure mostly in urban areas in which broken glass, nails, other debris, potholes, and gravel appear on the roads with some regularity. I realize that these reliable annoyances constitute a good reason to take counter readings at numerous random locations during measuring so that a flat doesn't cause the entire measurement to be tossed. However, it sounds as though my big hybrid tires are subject to greater expansion and contraction than thinner tires of any pneumatic ilk.
Has anyone else noticed, while running a race, that the distance between the ultimate mile mark and the Finish of a standard metric-distance course seems excessively long? If tire expansion occurs during the measurement of this course, it seems this could be part of the difference. In the converse situation during measuring, a big drop in temperature during the measurement could cause a difference in the "wrong" direction. I wondered about this in my last tandem marathon measurement, as we recorded the mile marks. We elected to leave the Finish unchanged after the post-cal numbers were negligibly different, even though the late afternoon/early evening summer air temperature had fallen more than 10°F. We did this because the temperature of the pavement had still changed very little from the day's average.