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THIS is a preliminary report of tire tests on cornering and self-alignment torque as they are affected by high-speed driving. Made at 100 mph on a standard chassis and a 10-ft test wheel, the experiments confirmed most previous smaller-scale, lower-speed work; but, the author reports, they also showed that self-aligning torque does not drop off at higher speeds at normal slip angle, as previously believed, and in addition suggested areas of the alignment torque problem which need (and are currently getting) further study.

Developments in the automotive industry have placed new demands on the performance of passenger car tires. The tire industry is conducting numerous tests to assure continued improvements and verify the capabilities of today's tires. Particular emphasis is being placed in the areas of durability, high speed performance, traction, and handling. The importance of keeping pace with new requirements is of the utmost significance in developing better tires for future needs.

The Effects of Tire Design/Construction Parameters: Mold Tread Radius, Tread Arc Width to Section Width Ratio, Aspect Ratio, Belt Width to Tread Arc Width Ratio, and Crown Angle were studied. By building tires with combinations of these parameters selected to fulfill the requirements of a designed experiment it was possible to determine the direct and interactive effects of these parameters on rolling resistance and cornering force. The results of these tests, including suggestions for optimum tire design, are discussed.

The laboratory practice of measuring tire rolling loss at constant, regulated pressure purposely deviates from in-service operations where the tire air is capped and the pressure varies with tire temperature. Nevertheless, even if the pressure is not allowed to change, the potential pressure increase between the initial (cold) and the equilibrium (hot) state of a tire can be estimated with the help of an equation developed from physical principles. Examples are given for passenger car, light truck, and heavy duty truck tires operated at constant speed but different loads and initial inflation pressures.

Information about the load capacity, dimensions, and traction characteristics of agricultural tires is readily available in the literature but there is limited information available about structural properties and performance parameters such as spring rate and cornering force. Generalized empirical relationships between tire dimensions and load capacity and tire stiffness parameters are presented. Differences between the statically deflected and rolling tire are discussed. The cornering or lateral force characteristics of agricultural tires are compared to automobile and truck tires with similar construction features.