The characterization of the rolling resistance is an important issue when designing mechanical systems in order to predict the force needed to run a given mechanism. Frictional forces in bearings and rolling resistance in rollers and wheels are the most important factors contributing to the overall resistance to the movement. As the rolling coefficient varies as a function of the material nature, normal load, and rolling velocity, it is desirable to test the designed system under real conditions. Mechanical testing machines, present in most mechanical laboratory tests, usually work in uniaxial mode. In this work a simple testing device to be used with uniaxial mechanical testing machines is presented.