Self-supporting tyre for vehicle wheels, and method for manufacturing the same

In a self-supporting tyre, the carcass plies (3a, 3b) are each made through sequential deposition of strip-like lengths circumferentially distributed on a toroidal support (11). Resilient stiffening inserts (16, 20) are interposed between the side portions (13a, 14a) of axially inner lengths (13), axially outer lengths (14) and possible axially intermediate lengths (15). In this way a sort of partly open container is created around at least one of the stiffening inserts (16, 20), the opening degree of which can be regulated depending on requirements, by modifying the solid space/void space ratio determined by the distance existing between the side portions (13a, 14a, 15a) of the strip-like lengths (13, 14, 15) coating each of the axially opposite sides of the stiffening insert itself.