The author describes a tyre testing rig which has recently been designed and constructed at the Lanchester Polytechnic, Coventry. The rig measures the six force and moment components acting in the contact patch of a tyre rolling slowly on a flat continuous surface for a wide range of slip angles, camber angles, tyre pressures and wheel loads.
Either driving or braking torques can be applied to the wheel axle and both the slip angle and the lateral displacement of the wheel can be varied sinusoidally or instantaneously in order to investigate the frequency responses and step responses of tyres.
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