Abstract: A tread pattern of a radial tire for motor-vehicles offering high performance comprises oblique longitudinal grooves, inclined to the circumferential direction of the tire by an angle included between 2.degree. and 20.degree., the opposite ends of said grooves being axially offset relative to one another: all grooves may be inclined in the same direction or may converge, preferably symmetrically, towards the mid-circumferential plane of the tire, specifically for directional patterns. The longitudinal grooves are associated with a plurality of transverse grooves having their central portion inclined in the opposite sense relative to the longitudinal grooves, according to an angle included between 30.degree. and 80.degree., with respect to the circumferential tire direction. The combination of the longitudinal and transverse grooves according to the established inclinations defines plugs on the tire contact-area.

Abstract: The device is composed of a series of two or more substantially circular protuberances that are eccentric with respect to the rim axis, and formed on the mounting rim in an axially inner position with respect to the bead seat, creating a confining space adjacent the bead seat and radially outwardly projecting with respect to it, so as to constitute a limit to the axial shifting of the tire bead heel towards the central well of the rim.

Abstract: A process is provided for the manufacture of radial tires for vehicle wheels, having an annular reinforcement structure inserted between the tread and the casing. The reinforcement structure has two layers of metal cord and in a radially outer position a third layer of cords arranged in a longitudinal direction. The third layer is made of a textile material which shrinks when heated. The process comprises the steps of first shaping the vulcanized casing to form a toroid, then applying to the shaped casing the two layers of metal cords together with a portion of the layer of textile cords at each side zone of the reinforcement structure. The width of the side zone is between 1/3 and 1/10 of the total width of the structure. The casing is shaped a second time to increase the external equatorial development thereof to a value greater than that reached during the first shaping step. The remaining central portion of the layer of textile cord is then applied on top of the layers of metal cords.