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After pointing out that the operating temperature is a vital factor in the life of a pneumatic truck-tire, the author outlines an investigation that was conducted at the plant of the Goodyear Tire & Rubber Co. This sought to determine (a) the best means of measing tire temperatures; (b) the temperature effect of inflation-pressure, load, long runs, frequency of stops, and the sizes of the rim and the tire; (c) the temperature of various designs of tire; and (d) some suitable means of reducing large-tire temperatures. The main reason for the rise in the temperature of a tire is stated to be the generation of heat resulting from rapid flexing; and the various factors having to do with this generation of heat and its dissipation to the atmosphere are listed. The laboratory testing-machine and the methods and apparatus employed to measure the temperatures are described.