Abstract
ABSTRACT FIVE 18.4-38 tires with varying tread designs were tested at an inflation pressure of 124 kPa and two levels of vertical load in both ^^undisturbed and '^tilled Capay clay soils using the UCD single-wheel traction tester. Three of the five tires had **long bar/short bar tread designs, whereas the other two had normal tread designs. Very high correlation coefficients were obtained when the net traction ratio and gross traction ratio were curve fitted to equations that are similar to the type reported by Wismer and Luth (1972). There were some significant differences in the tractive ability between different tread designs in the undisturbed capay clay soil but the differences were insignificant in a tilled Capay clay soil.
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