The article presents assessment of traction properties change as a result of the increase of wheel load on soil with varied properties. Investigation was carried out for a radial tyre 11.2R24, three wheel loads were used: 6110, 7330, 8060 N. Assessment of traction properties was carried out based on the comparison of the tractive force value, towing power, rolling resistance and traction efficiency and values of power on a wheel with the investigated tyre. The research was carried out in field conditions with the use of a mobile aggregate stand with a farm tractor. Significant impact of the soil condition on all analysed parameters, except for power lost for skid, was proved. Moreover, a significant impact of load changes on the tractive force and its components and components of power supplied to a wheel were reported. No impact of load changes on tractive force values was reported.