Method for obtaining the deformation of a tyre casing subjected to a load, in an inflated and laden state rotating at a rotational speed W, said tyre casing having a crown, two sidewalls and two beads of revolution about a natural axis of rotation and a median plane, the intersection between the median plane and the natural axis of rotation defining a wheel centre, comprising the following steps: - Fixing at least one sensor on the tyre casing in line with the crown at a radial position R with respect to the natural axis of rotation and able to generate at least one output signal proportional to the acceleration experienced by said sensor in the tyre casing; - Acquiring at least a first abscissa signal u comprising at least the amplitude of the acceleration in the direction normal to the crown when running at the rotational speed W; - Determining a reference acceleration γ reference that is a function of the rotational speed W and of the position of at least one sensor; - Identifying a first series of increments I, corresponding to the abscissa value u of the at least one first signal at which the first signal crosses a threshold value B. - Delimiting the first signal between a first increment I min and a second increment I max so as to construct a wheel revolution signal Sig TdR; - Defining at least a first energy density S which is a function of the wheel revolution signal, and of the reference acceleration γ reference, and which is denoted S + when the wheel revolution signal is above a threshold value A, or is denoted S - when the wheel revolution signal is below or equal to said threshold value A; - Identifying the deformation of the tyre casing Def %, which deformation is generated by the load as a function of the reference acceleration γ reference and of the first energy density S. - Fixing at least one sensor on the tyre casing in line with the crown at a radial position R with respect to the natural axis of rotation and able to generate at least one output signal proportional to the acceleration experienced by said sensor in the tyre casing; - Acquiring at least a first abscissa signal u comprising at least the amplitude of the acceleration in the direction normal to the crown when running at the rotational speed W; - Determining a reference acceleration γ reference that is a function of the rotational speed W and of the position of at least one sensor; - Identifying a first series of increments I, corresponding to the abscissa value u of the at least one first signal at which the first signal crosses a threshold value B. - Delimiting the first signal between a first increment I min and a second increment I max so as to construct a wheel revolution signal Sig TdR; - Defining at least a first energy density S which is a function of the wheel revolution signal, and of the reference acceleration γ reference, and which is denoted S + when the wheel revolution signal is above a threshold value A, or is denoted S - when the wheel revolution signal is below or equal to said threshold value A; - Identifying the deformation of the tyre casing Def %, which deformation is generated by the load as a function of the reference acceleration γ reference and of the first energy density S.