The TMPH rating defines another factor for evaluating the performance capability of off-the-road tires. The TMPH rating is a measure of work per unit time and as such is intended to supplement information published by tire industry standards associations and by tire manufacturers. The TMPH test was developed using Tire and Rim Association standards (Section 3@ Off-the-Road@ TRAY Yearbook) and reference is made to these specifications throughout the procedure. The test procedure is also applicable to tire and rim developments approved by the tire and rim manufactures@ although not published in the TRA Yearbook. This test procedure does not define how the TMPH rating is applied in evaluating specific applications to machines or their performance. Purpose-This procedure provides a uniform method for determining the work capability or ton-mile per hour (TMPH) rating of an off-the-road tire as limited b its operating temperature. This practice is applicable to tires used on earthmoving machines as defined in SAE J1057a (June@ 1975). It is also applicable to certain of the machines referenced in SAE J1116 (July@ 1975).