The rolling resistance and maximum tractive force for off-road tyres
were used to evaluate the tractive performance under different running
conditions. Two tyres have been used each was operated at four different
inflation pressures and different load in sand. The results were compared with
the well-established empirical techniques developed to predict tyre tractive
performance. A single wheel tester has been used to measure the tractive
performance for off-road tyres. The result indicate that, lowering tyre inflation
pressures increases tractive force and rolling resistance, and the increase of
applied load increases the rolling resistance and at a certain inflation pressure
where any increase of load causes a reduction of traction force. On soft soil
surface, the smaller tyre had the lower performance than the larger one.