A vehicle rim with symmetry of revolution intended for mounting a tire, including a first seat intended to receive and retain a first bead of the tire; a mounting groove; and a second seat intended to receive and retain a second bead of the tire, the second seat being of an average diameter smaller than the average diameter of the first seat, characterized in that the maximum radial depth of the mounting groove (Hmax) is such that the second bead can negotiate the first seat.