Internal Air Temperature Measurements in Tyres — A Major Advance in Earth mover Tyre Pressure Control

Tyre costs constitute 20-40 per cent of the operating cost of large haulage trucks, and tyre pressure maintenance is an important factor in minimizing costs.

In the past, control over the hot (built-up) pressures of earthmover tyres has been inaccurate and inconsistent because it has not been possible, in a practical way, to measure the tyre's contained air temperature.

A method for measuring this contained air temperature has now been devised using a bimetallic probe thermometer inserted through the valve stem. Using these measurements in conjunction with a pressure-temperature chart drawn up using the general gas equation, very accurate control over hot tyre pressures is now possible.