Patent ID: 7152646

Claim:
A heavy duty tire comprising a carcass comprising a carcass ply of cords extending between bead portions and turned up around a bead core in each bead portion from the inside to outside of the tire so as to form a pair of turnup portions and a main portion therebetween, and a bead reinforcing layer comprising at least one reinforcing ply of cords disposed in each said bead portion, wherein the turnup portion comprises a turnup main part extending within an inner region inside a extension line obtained by extending a radially outer surface of the bead core, and a turnup sub part extending within an outer region outside said extension line through a portion near the radially outer surface of said bead core, and wherein the reinforcing ply comprises a center portion extending along the radially inside surface of the turnup main part, an axially outside portion extending from the center portion to the radially outside of the tire apart from said turnup portion, and an axially inside portion extending from the center portion to the radially outside of the tire through the inside of said main portion, and wherein in a state of standard internal pressure when the tire is mounted on a standard rim and inflated by a standard pressure but loaded with no tire load, the outer end of the turnup sub part is positioned at an inner side of a reference line intersecting vertically with said main portion through a point at which the outer surface of said bead portion is apart from the flange of the standard rim, and the shortest distance (Lp) between the outer end of the turnup sub part and the reference line is 2 to 12 mm.