The contents of the paper point out the necessity of combining the theoretical and experimental approaches in the investigation of tyre load in vehicles. The models are planar and they model the cross-section of the tyre enabling the consideration of the bottom load and the internal pressure in the tyre, as well as the influence of the lateral force. The paper presents the findings, the formulations necessary for solving the task obtained in the experimental model tests and serving as a basis for comparison with the results obtained from purely theoretical approaches, e.g. by the method of finite elements, with identical load conditions. The steel cords reinforcing motor vehicle tyres are unevenly loaded in time as the tyre is in operation and in contact with the road surface. The conditions for conducting and evaluating experimental tests that would model the considered loading of the steel-cord-reinforced tyre have been defined. To be able to conduct these experimental tests, it was necessary to design simple test equipment for cyclic loading of the test specimens.