Heavy duty tyre

HEAVY DUTY TYRE A pneumatic tyre (10) comprising a carcass (14), the carcass (14) having one or more cord reinforced plies (19) and a pair of bead portions (16), each bead portion (16) having at least one bead core about which the cord reinforced plies (19) are wrapped, a tread (12), a pair of sidewalls (18) extending radially inward from the tread (12) to the bead portions (16), and a belt reinforcing structure disposed radially outward of the carcass (14), each bead portion (16) further comprising an annular tensile member and an apex (24) which extends radially outward of the at least one bead core, and a chafer (28), said one or more cord reinforced carcass plies (19) having a turndown portion which extends from the crown and axially inward of the at least one bead core in each bead portion and a turnup portion in each bead portion which extends radially outward from the at least one bead core and axially outward of the at least one bead core, the tyre (10) further comprising in each bead portion (16) a turn-up pad (30) located adjacent said chafer (28), wherein the cross sectional thickness of the turn-up pad (30) is in the range of 1.0 inches (25 mm) to 2.0 inches (51 mm) as measured in a direction perpendicular to a longitudinal axis of the turn-up pad (30) and at a radius of 4.0 inches (102 mm) from the bead core centre, wherein the annular tensile member has a width in the range of 2.5 inches (64 mm) to 2.7 inches (69 mm).