The article deals with the description of the experimental results of static radial deformation characteristics measurement for the selected tire and its impact on the size of the contact area, contact pressure and rolling resistance on a solid support. The measurement was carried out on the diagonal tire Mitas TS05 10.0/75-15.3 PR10 in the area of the test soil channel. The radial deformation characteristics of the tire in question were determined for inflation pressures of 300 kPa, 220 kPa, 160 kPa, and 100 kPa, with a radial load of the tire varying in the range from 567.9 kg to 1025.09 kg. At the same time, the treadmarks of the tire contact area were made for the corresponding inflation pressure and the corresponding radial load. The size of these treadmarks was subsequently measured using the digital Koizumi KP-90N polar planimeter. The mean contact pressure values on a solid support were subsequently calculated from the values of the tire radial load and the obtained contact surfaces. The calculated static radial stiffness value was obtained through the linearization of the measured deformation characteristics according to Jante. Rolling tire resistances on a solid support were verified by pulling the test wheel using the auxiliary winding system of the test equipment, the soil channel, along the concrete surface after removing the container with soil.