<div class="section abstract"><div class="htmlview paragraph">THIS paper reviews earlier work concerned with steering characteristics of tires and wave formation in tires revolving at high speeds. The authors describe various machines used in obtaining fresh, experimental evidence to support earlier theories.</div><div class="htmlview paragraph">A new approach is made to the problem of power consumption of tires. Equations relating wavelength to high-speed power consumption of tires are supported by new experimental evidence.</div><div class="htmlview paragraph">In order to examine changes in cornering force and self-aligning torque with speed, the authors use the suggestion that a forward movement of the center of pressure in the tire contact patch depends upon an increase in power consumption of the tire.</div><div class="htmlview paragraph">Variations in tire characteristics with extreme braking and traction forces are examined in parallel with suggested changes in the shape of the tire contact patch. Factors affecting the handling of a sports car at the point of tire breakaway are examined.</div></div>