Abstract: The invention relates to the lugs of tires intended to be mounted at least on the driving wheels of agricultural and industrial tractors; said lugs have the front sidewall, with respect to the running direction of the vehicle when in service, shaped according to a curvilinear profile which produces considerable advantages as regards the wearing-out, the efficiency, and the lifetime of the tire itself. This curvilinear profile is expressed by the equation:y=Ax.sup.3 +Bx.sup.2 -Cxwhere A, B and C are constants linked to the geometry of the lug.

Abstract: A process and apparatus for the manufacture of pneumatic tires comprising a carcass formed of reinforcing plies and bead cores are disclosed. The tire carcass is built up around a first drum in cylindrical configuration and bead cores are applied to the carcass. The carcass is transferred telescopically to and around a second expandable drum. The carcass is then torically shaped and the ends of the plies turned-up around the bead cores.

Abstract: A process and apparatus for the manufacture of pneumatic tires comprising a carcass formed of reinforcing plies and bead cores are disclosed. The tire carcass is built up around a first drum in cylindrical configuration and bead cores are applied to the carcass. The carcass is transferred telescopically to and around a second expandable drum. The carcass is then torically shaped and the ends of the plies turned-up around the bead cores.