A method is described where two rotary potentiometers are fitted into a small tubeless low ground pressure tyre. Cords were attached from the potentiometer shafts to the inside of the tyre carcass centre line and the arrangement was used to dynamically measure the radial and tangential tyre deflection. The data were also used to estimate the soil-tyre contact length and the contact area. For radial deflections of greater than 20 mm the accuracy of measuring the contact area was estimated to be within 10%.
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