Assembly process of a vehicle wheel comprising a tire consisting of two tire beads and a rim, - said wheel rim for a vehicle, including: - a first section consisting of a rotation axis and a central plane perpendicular to said rotation axis, - a second section consisting of a second axis and a second plane perpendicular to said second axis, - a third section defining a third axis and a third plane perpendicular to said third axis, - said first section is essentially ring-shaped and comprises a coupling part and a supporting part, - said support part should consist of a ring structure centred on said rotation axis forming an inner surface, an outer surface and two support crowns centred with respect to said axis of rotation and mutually arranged symmetrically with respect to the central plane, - said fastening part consists of a crown centered along said rotation axis, secured to said internal surface and capable of movement while secured to the external part of the wheel rim, - said second and third sections (3, 4) each forming a ring structure with sections parallel, respectively, to the central planes (3b, 4b) variants in diameter along the second and third axes (3a, 4a), - said second and third sections (3, 4) defining at their axial ends, respectively, a first crown (30, 40) and a second crown (31, 41) which has a smaller diameter than the first crown (30, 40), and a support belt (32, 42), - said second crowns (31, 41) have an outer diameter that is smaller than the maximum diameter of the support crowns and designed to be removably secured to the support crowns, - said sections (2, 3, 4) defining an operative configuration in which said first and second sections (2, 3) and said first and third sections (2, 4) are mutually secured and said axes (2a, 3a, 4a) are mutually aligned, - said support belts (32, 42) determine with at least part of said support crowns, the profiles (5a, 5b) each of which is counter-shaped to the tire beads and said tire is designed to house the beads, and said method characterized by the fact that it comprises: - a first step in which the thickness of said tire bead is evaluated to ensure that it is operationally compatible with the rim, - a second step in which said second and third sections (3, 4) are selected so that said distance between the first crown (30, 40) and the second crown (31, 41) is compatible with said thickness, - a third step in which said tire is placed into the first section, - a fourth step in which said second and third sections (3, 4) are connected to the first section so as to secure each of the tire beads to their respective profile (5a, 5b). - said wheel rim for a vehicle, including: - a first section consisting of a rotation axis and a central plane perpendicular to said rotation axis, - a second section consisting of a second axis and a second plane perpendicular to said second axis, - a third section defining a third axis and a third plane perpendicular to said third axis, - said first section is essentially ring-shaped and comprises a coupling part and a supporting part, - said support part should consist of a ring structure centred on said rotation axis forming an inner surface, an outer surface and two support crowns centred with respect to said axis of rotation and mutually arranged symmetrically with respect to the central plane, - said fastening part consists of a crown centered along said rotation axis, secured to said internal surface and capable of movement while secured to the external part of the wheel rim, - said support part should consist of a ring structure centred on said rotation axis forming an inner surface, an outer surface and two support crowns centred with respect to said axis of rotation and mutually arranged symmetrically with respect to the central plane, - said fastening part consists of a crown centered along said rotation axis, secured to said internal surface and capable of movement while secured to the external part of the wheel rim, - said second and third sections (3, 4) each forming a ring structure with sections parallel, respectively, to the central planes (3b, 4b) variants in diameter along the second and third axes (3a, 4a), - said second and third sections (3, 4) defining at their axial ends, respectively, a first crown (30, 40) and a second crown (31, 41) which has a smaller diameter than the first crown (30, 40), and a support belt (32, 42), - said second crowns (31, 41) have an outer diameter that is smaller than the maximum diameter of the support crowns and designed to be removably secured to the support crowns, - said sections (2, 3, 4) defining an operative configuration in which said first and second sections (2, 3) and said first and third sections (2, 4) are mutually secured and said axes (2a, 3a, 4a) are mutually aligned, - said support belts (32, 42) determine with at least part of said support crowns, the profiles (5a, 5b) each of which is counter-shaped to the tire beads and said tire is designed to house the beads, - a first step in which the thickness of said tire bead is evaluated to ensure that it is operationally compatible with the rim, - a second step in which said second and third sections (3, 4) are selected so that said distance between the first crown (30, 40) and the second crown (31, 41) is compatible with said thickness, - a third step in which said tire is placed into the first section, - a fourth step in which said second and third sections (3, 4) are connected to the first section so as to secure each of the tire beads to their respective profile (5a, 5b).