Method for estimating the position of the centre of a tyre for vehicle wheels, comprising: a) acquiring, according to a side view, an image of the tyre with a sidewall laid on a supporting portion lying on a plane, b) defining, in the acquired image, a number n of analysis directions α 1 , α 2 , ..α i ,.. α n intersecting at one selected central point (Pc), with n and i integers, n>1 and 1 ≤ i ≤ n; c) for each analysis direction α i : c1) defining, in the acquired image, a number m of potential axes of symmetry s i1 , s i2 , .. s ij , .. s im , perpendicular to the analysis direction α i , where m and j are integers, with m>1 and 1 ≤ j ≤ m, and c2) calculating a level of symmetry of the image with respect to each of said potential axes of symmetry s i1 , s i2 , .. s ij , .. s im , wherein said level of symmetry is indicative of the probability that the centre of the tyre is on the respective potential axis of symmetry s i1 , s i2 , .. s ij , .. s im ; c3) determining a probability distribution P αi indicative of a variation of said level of symmetry along said analysis direction α i ; d) determining the position of the centre of the tyre on the basis of a cumulative probability distribution P merged obtained through a combination of the probability distributions P αi calculated for said analysis directions α 1 , α 2 , ..α i ,.. α n . a) acquiring, according to a side view, an image of the tyre with a sidewall laid on a supporting portion lying on a plane, b) defining, in the acquired image, a number n of analysis directions α 1 , α 2 , ..α i ,.. α n intersecting at one selected central point (Pc), with n and i integers, n>1 and 1 ≤ i ≤ n; c) for each analysis direction α i : c1) defining, in the acquired image, a number m of potential axes of symmetry s i1 , s i2 , .. s ij , .. s im , perpendicular to the analysis direction α i , where m and j are integers, with m>1 and 1 ≤ j ≤ m, and c2) calculating a level of symmetry of the image with respect to each of said potential axes of symmetry s i1 , s i2 , .. s ij , .. s im , wherein said level of symmetry is indicative of the probability that the centre of the tyre is on the respective potential axis of symmetry s i1 , s i2 , .. s ij , .. s im ; c3) determining a probability distribution P αi indicative of a variation of said level of symmetry along said analysis direction α i ; c1) defining, in the acquired image, a number m of potential axes of symmetry s i1 , s i2 , .. s ij , .. s im , perpendicular to the analysis direction α i , where m and j are integers, with m>1 and 1 ≤ j ≤ m, and c2) calculating a level of symmetry of the image with respect to each of said potential axes of symmetry s i1 , s i2 , .. s ij , .. s im , wherein said level of symmetry is indicative of the probability that the centre of the tyre is on the respective potential axis of symmetry s i1 , s i2 , .. s ij , .. s im ; c3) determining a probability distribution P αi indicative of a variation of said level of symmetry along said analysis direction α i ; d) determining the position of the centre of the tyre on the basis of a cumulative probability distribution P merged obtained through a combination of the probability distributions P αi calculated for said analysis directions α 1 , α 2 , ..α i ,.. α n . <EOS>