A method for controlling tyres comprising: i) arranging a tyre on a support plane with axial middle line plane substantially parallel to the support plane, defining an abutted lateral portion of the tyre and a free lateral portion of the tyre arranged at a specific height with respect to said support plane; ii) applying, to a measurement surface of the free lateral portion, a force directed towards the support plane; iii) modifying the angular position of the measurement surface with respect to a rotation axis of the tyre, with regard to the free lateral portion; iv) setting a first value of input data corresponding to said force or to said height at each position of the measurement surface, maintaining it substantially constant along at least one complete rotation of the measurement surface around said rotation axis; v) detecting a first value of output data at each position of the measurement surface, said output data corresponding to: said force if said input data is the height of the free lateral portion of the tyre at each position of the measurement surface, or to said height if said input data is the force applied at each position of the measurement surface; characterized in that the method comprises: vi) setting a second value of the input data, maintaining it substantially constant along at least one complete rotation of the measurement surface around said rotation axis; wherein said first value of the input data is different from said second value of the input data; vii) detecting a second value of the output data at each position of the measurement surface, said second value of the output data corresponding to the second value of the input data; viii) calculating, at each position of the measurement surface, a relation between said second value of the output data and said first value of the output data. i) arranging a tyre on a support plane with axial middle line plane substantially parallel to the support plane, defining an abutted lateral portion of the tyre and a free lateral portion of the tyre arranged at a specific height with respect to said support plane; ii) applying, to a measurement surface of the free lateral portion, a force directed towards the support plane; iii) modifying the angular position of the measurement surface with respect to a rotation axis of the tyre, with regard to the free lateral portion; iv) setting a first value of input data corresponding to said force or to said height at each position of the measurement surface, maintaining it substantially constant along at least one complete rotation of the measurement surface around said rotation axis; v) detecting a first value of output data at each position of the measurement surface, said output data corresponding to: said force if said input data is the height of the free lateral portion of the tyre at each position of the measurement surface, or to said height if said input data is the force applied at each position of the measurement surface; said force if said input data is the height of the free lateral portion of the tyre at each position of the measurement surface, or to said height if said input data is the force applied at each position of the measurement surface; vi) setting a second value of the input data, maintaining it substantially constant along at least one complete rotation of the measurement surface around said rotation axis; wherein said first value of the input data is different from said second value of the input data; vii) detecting a second value of the output data at each position of the measurement surface, said second value of the output data corresponding to the second value of the input data; viii) calculating, at each position of the measurement surface, a relation between said second value of the output data and said first value of the output data.