A method for determining a pivoting angle (alpha) of a wheel unit (12) mounted onto a snap-in inflation valve (10) includes the following three phases: observation of a curve representing the effect of gravity on the radial acceleration Ames of a wheel of the vehicle on a sensing axis Y' which is related to the wheel unit and is not parallel to the axis of rotation of the wheel, by spectrum analysis of the gravity curve at a sampling frequency Fs greater than an assumed rotation speed omega of the wheel, deduction of the actual rotation speed omega of the wheel, and determination of the pivoting angle alpha according to the formula cos  alpha = A mes _ omega 2  × R , where omega is the actual angular speed deduced from the observation of the curve, Ames is a mean value of the corrected radial acceleration, and R is a standardized radius of the wheel.