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An experimental setup has been conceived to measure the deformation of a rolling ring subjected by stress. This deformation is measured by means of a capacitive sensor. Such a sensor behaves like a displacement sensor that translates the displacement into an electrical signal. Mechanical and electrical operating points determine the sensitivity of the probe and its measurement range. Numerical simulations and tests performed on a prototype confirm the relevance of the device. Applications are numerous: i) mounted on the wheels of motorized vehicles, such sensors allow one to improve the quality information transmitted to integrated safety devices and ii) placed on devices of lift, they measure the load.