Abstract: An improved rear axle suspension system wherein independently suspended wheels are supported from an extremity of a trailing wheel arm by a wheel spindle thereof, the wheel arms having extensions aligned transversely of the vehicle and constituting semi-axles, the adjacent ends of which engage in rotatable fashion with one being disposed at least partially inside the other, while the other ends are rotatably supported by bracing elements fastened to longitudinal frame members of the vehicle, the shock absorbers being attached at their upper ends to extensions of these lateral bracing elements and at their lower ends to the shanks of the wheel spindles, such that the axes of rotation of the wheel arms and of the shock absorbers are as far apart as possible, the extensions of the lateral bracing elements to which the upper ends of the shock absorbers are attached being disposed so that the shock absorbers are slightly inclined to the horizontal, whereby a sensibly variable reduction ratio between the displaceme