Proof is the provision of objective, unbias empirical research:
I wonder if we're talking about two different things. You're wanting unbiased empirical research seeking to learn at what point the tire integrity is impacted by heat/pressure
? If so, sure I'd like to find out that as well mostly out of curiosity, not because I'm concerned about my tire blowing up or melting.
Now if the question is do we need new empirical proof that tires DON'T blow up or melt in real world hot conditions
, then no we don't need any we already have millions of miles logged annually thru scorching heat with no tires blowing up or melting which is 100% empirical, not theoretical. Perhaps you heard of at least a few anecdotes to give you cause for concern or is it just hard to fathom that tires in good condition can handle that? How close was I at 112.9F, and of course the others on the same route of which there were several as there are regularly throughout the SW? I agree it would be good to know where one should start avoiding getting that close to.
As I say by the time temperatures get to the crazy hot zone best not to be riding anyway. It would be great to know WHEN tires in good condition are at risk for a heat/pressure related blowout but my sense is it's probably going to be above the point at which we will be stupid enough to ride in!
Here's something I found from none other than Dunlop R&D:
"However, it's one thing to still have three functioning wheels (or more for trucks) and another if a motorcyclist experiences a blown tire while cruising down the road at 70 mph. Tires naturally heat up when in motion and since asphalt temperature can exceed 40 degrees (and even as high as 60 degrees) warmer than the air temperature, you might question the safety of riding your motorcycle in temperatures hot enough to fry an egg on the road.
Yes, heat does affect tires. But, how concerned should motorcycle riders be when it comes to riding in hot weather and ruining the integrity of the tires over the long term, or worse, facing the prospect of a blown out tire?
To help answer the question, we enlisted the help of Tom Grolemund and Shawn Bell from the Research and Development team at Dunlop Motorcycle Tires.
The short answer is this: For a properly inflated tire, under normal operating conditions based on application, heat should not be a concern.
Grolemund and Bell offered these additional points when it comes to the effect of heat on motorcycle tires:
The most common failures due to heat result from under inflation. Under inflation stresses the carcass of the tire and generates heat due to excessive flex in the carcass. On a properly inflated tire, there is no such thing as overheating
(with the possible exception of some extreme race applications). Compounds are designed to work within a wide range of temperatures.
However, at the extremes (extremely hot or extremely cold asphalt) you'll be operating outside of the ideal range. This can lead to reduced performance."
Unfortunately they ducked the meaning of, "extremely hot", but did not say the tire was in jeopardy of blowing out, they kept the concern to "reduced performance".
And really, moreover, when it comes to making safety-related statements corporate spokespeople are going to er on the conservative side for obvious reasons. They certainly had the opportunity to in these comments above, but they didn't they said "there is no such thing as overheating".
And of 2 other articles about this absolutely the recommendation is: whatever you do...don't deflate the tire when it's hot!