Bob -
I am certainly no expert on tires, but on various tire manufacturers' web sites, I have read a couple things that may be relevant.
1. Tire deformity was a problem many years ago. The phrase I recall was "nylon thump", and a Google search still generates many hits on this phrase. It referred to the propensity of early nylon tires to develop a flat spot, sometimes as quickly as overnight. It didn't cause any damage, but was annoying for a few minutes as the tire rounded out again. I think that tire manufacturers have largely (though not entirely) overcome deformity problems. Since the days of "nylon thump", I've never experienced it even after months of storage.
2. Tires should not be allowed to stand for long periods of time on dirt, asphalt, or concrete, regardless of whether they are under full load or unweighted. The reason is that these materials tend to draw oils out of the rubber, drying the tire prematurely. Roll the vehicle up onto a board instead.
Take it for what it is worth.
Bill
|