bsieb - butyl rubber normal operating temperature range is up to 250'F higher for short periods. That's enough to sizzle flesh - off the top of my head thats a potential increase in pressure of something like 25~30% as the tire heats up. If tires are inflated to the max I would imagine overpressure is more of a concern than temperature in the context of a blowout.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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