An off-the-road tyre fails from heat long before it wears out. TKPH — tonne-kilometre per hour — is how much weight the haul moves, how fast, all day. Every mining tyre carries a rated figure; fit one rated below the site's and the casing cooks.
What ONE tyre carries with the machine full — not the payload, and not the whole machine.
The same tyre with the machine empty. The truck runs empty half the cycle and that half counts.
Total distance divided by total hours, including queueing and standing — not the speed on the ramp.
Rated figures assume 38 °C. A hotter site sheds less heat and demands more of the tyre.
Only used to warn you. Beyond 5 km the tyre never gets a cool cycle.
From the tyre maker's data book, for that exact size and pattern.
377 TMPH · mean load 27.5 t
Mean load per tyre is the average of loaded and empty, because the machine spends about half its cycle each way. Multiply by the mean speed and that is the site figure. The temperature correction scales with speed, because what it is really correcting is the airflow over the tyre: hotter air carries less heat away, and a slow truck has less airflow to lose.
Grade, road surface, inflation pressure, rubber compound, how the load sits, and how much tread is left. It is the standard calculation, not a simulation — an input to a decision rather than the decision. If the answer is close, ask the tyre maker.
Worked out here, not looked up.