Yes... risk is a combination of consequence, probability of occurrence, and ease of avoidance.
In this case, the consequence of a failure is easy to imagine and so bad as to dominate the assessment.
But the variation in the other factors is the hard part.
This is why I was wondering if there were DOT standards/regulations around thermo-chemical longevity.
It would also be interesting to know if any specific tire manufacturers try to distinguish themselves by offering improved resistance to aging. If so, they might actually share data or at least make claims... ??
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