The tires are going to be designed to withstand above and beyond by at least a factor of 1.2 of max sidewall, max temp and max speed(ambient air temp and then tire temp, because they will be drastically different). Given, they might not be able to get a safety factor of better than 1.2 in there so running it max sidewall on really scorcher days at high speed and you might end up upside down. I go to max sidewall and stay just under the speed limit. If you are at sidewall speeding is ok but you go over and the complicated equations for thin walled pressure members and tire elasticity with the thermal expansion of the tire belts. . .let's just say there exists the possibility of havoc. . .
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