Abstract: A heavy-duty tire, wherein each bead portion (2) is defined by a metal bead bundle (3), about which are turned up a body ply (8), a reinforcing strip (9), and an outer cover layer (10). The outer cover layer is defined by an innerliner (11), an abrasion gum strip (12) which is connected to the innerliner (11) by a splice (14) and is located beneath the innerliner (11), and a sidewall (13). Between the reinforcing strip and the outer cover strip (10), there is inserted a damping strip (21) directly contacting the abrasion gum strip (12) and defined by a mix impermeable to air.

Abstract: A unistage drum (1) for producing an agricultural tire (2), the drum (1) having a fixed central body (16) for supporting a relatively thin central portion (11) of the carcass (3) of the tire (2), and two movable half-drums (15) located on opposite sides of the central body (16) to support respective thicker lateral portions (12) of the carcass (3). Each half-drum (15) has a respective expandable bead clamping device (23), and is, at least along a portion projecting outwards of the relative bead clamping device (23), of a diameter (D2) smaller than the diameter (D1) of the central body (16) so as to compensate for the differences in thickness between the central portion (11) and the lateral portions (12) of the carcass (3).

Abstract: A drum (1) for building tires (2), the drum (1) having two half-drums (12), each of which has an expandable bead clamping device (20), and at least one shaping bladder (27) and a turn-up bladder (33) fixed to an outer tubular body (16) of the half-drum (12) on opposite sides of the respective bead clamping device (20); each turn-up bladder (33) having an outer annular lip (34) extending, at rest, along the respective half-drum (12) and covering the respective bead clamping device (20) and substantially the whole respective shaping bladder (27).

Abstract: A heavy-duty tire, wherein each bead portion (2) is defined by a metal bead bundle (3), about which are turned up a body ply (8), a reinforcing strip (9), and an outer cover layer (10). The outer cover layer is defined by an innerliner (11), an abrasion gum strip (12) which is connected to the innerliner (11) by a splice (14) and is located beneath the innerliner (11), and a sidewall (13). Between the reinforcing strip and the outer cover strip (10), there is inserted a damping strip (21) directly contacting the abrasion gum strip (12) and defined by a mix impermeable to air.

Abstract: A drum (1) for building tires (2), the drum (1) having two half-drums (12), each of which has an expandable bead clamping device (20), and at least one shaping bladder (27) and a turn-up bladder (33) fixed to an outer tubular body (16) of the half-drum (12) on opposite sides of the respective bead clamping device (20); each turn-up bladder (33) having an outer annular lip (34) extending, at rest, along the respective half-drum (12) and covering the respective bead clamping device (20) and substantially the whole respective shaping bladder (27).