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Radial tyres disapate heat through contact with the road surface. As a tyre rotates, with constant load and torque passing through the carcass, contact with the road makes the sidewall continually flex. This flex causes friction and heat within the tyre (additionally, brake heat permiates through the wheel to the tyre carcass). The heat transfers into the tread via the sidewalls. The Tyre and wheel as a unit reaches and exceeds the temperature of the road surface. Rotational contact with the road surface via the tread acts like a heat sink and stabilizes the condition. The temperature within the tyre becomes constant.
In the worst case, if your inflation pressure is way too low (or you have a slow leak) the sidewall will be flexing to a point where the heat generated will overwhelm the tyres ability to transfer the heat. As a result, the tyre will fail and delamination will be inevitable.
Note: Aggressive mud tyres have difficulty dispersing heat because they have a low rubber to void ratio, therefore mud tyres will wear faster. Highway tread patterns have high rubber to void ratios and are capable of dissapatng heat more rapidly therefore lasting longer with less tread wear.
