Abstract
The tractive performance of five sizes of tractor driving wheel tyres were measured in thirteen field conditions during the autumn and winter of 1971–1972 using the N.I.A.E. Single Wheel Tester Mk II. The results indicated that reducing inflation pressure produced a significant increase in coefficient of traction and increasing section width produced a significant reduction in rolling resistance. Investigation of methods of predicting tractive performance from soil measurements suggested that soil shear strength and soil-rubber friction were likely to provide a better indication of coefficient of traction than would cone penetrometer measurements but that the cone penetrometer would provide useful indications of coefficient of rolling resistance and maximum tractive efficiency.
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