Tests were carried out to compare the effect of longitudinal force on the lateral force and aligning moment produced by a bias and a radial tire for different slip angles. Small differences occurred in the lateral force‐driving force characteristics at low slip angles. Large differences occurred between the aligning moment‐longitudinal force characteristics of the two tires, when the bias but not the radial tire exhibited a negative aligning moment upon the application of a braking force. These differences were caused mainly by differences in the pressure distributions in the contact patches of the two tires.

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