A rolling toy comprising at least one pair of parallel wheels arranged on either side of a body of the toy, these wheels defining between each other a track in the axial direction, each wheel comprising: - a hub; - a rim provided with a tread; and - a plurality of spokes extending from the hub to an inner region of the rim, - the spokes are elastically deformable; - the unit formed by the hub and the spokes is mounted in the rim, with the spokes under compressive stress, so as to produce by buckling effect a flexion of the spokes bending these latter and axially offsetting the plane of the hub with respect to that of the rim, characterized in that: - the unit formed by the hub and the spokes is adapted to take two different positions also stable according to the direction of flexion of the spokes, with:. an extended position, with an enlarged track (V M), in which the rim plane (P') is located at a greater distance (Δ +) from the hub plane (Po), axially with respect to the toy body, and. a retracted position, with a reduced track (V m), in which the rim plane is located at a smaller distance (Δ -) from the hub plane (Po), axially with respect to the toy body; and - the shape and elasticity of the spoke material are chosen so as to allow an inversion of the direction of flexion of the spokes, and correlatively the passage from the extended position to the retracted position, or vice versa, under the effect of an external mechanical effort applied axially to the rim, respectively in one direction A) or in the other. - a hub; - a rim provided with a tread; and - a plurality of spokes extending from the hub to an inner region of the rim, - the spokes are elastically deformable; - the unit formed by the hub and the spokes is mounted in the rim, with the spokes under compressive stress, so as to produce by buckling effect a flexion of the spokes bending these latter and axially offsetting the plane of the hub with respect to that of the rim, characterized in that: - the unit formed by the hub and the spokes is adapted to take two different positions also stable according to the direction of flexion of the spokes, with:. an extended position, with an enlarged track (V M), in which the rim plane (P') is located at a greater distance (Δ +) from the hub plane (Po), axially with respect to the toy body, and. a retracted position, with a reduced track (V m), in which the rim plane is located at a smaller distance (Δ -) from the hub plane (Po), axially with respect to the toy body; and. an extended position, with an enlarged track (V M), in which the rim plane (P') is located at a greater distance (Δ +) from the hub plane (Po), axially with respect to the toy body, and. a retracted position, with a reduced track (V m), in which the rim plane is located at a smaller distance (Δ -) from the hub plane (Po), axially with respect to the toy body; and - the shape and elasticity of the spoke material are chosen so as to allow an inversion of the direction of flexion of the spokes, and correlatively the passage from the extended position to the retracted position, or vice versa, under the effect of an external mechanical effort applied axially to the rim, respectively in one direction A) or in the other.