To determine stiffness characteristics, compression tests are performed on the rim edge using a special compression mandrel. The machine employed is a free-standing testing machine with a forward projecting T-slot crosshead, adjustable for height, allowing rims to be loaded and clamped at a comfortable height. The load cell ensures precise measurement of the axial load, even when lateral forces arise due to the geometrical form of the rim. 

Thanks to its special construction and layout the load cell can be used for measurement in the upper and lower test areas of the machine.