Patent ID: 6986375

Claim:
A heavy duty radial tire comprising a carcass ply in which a carcass ply main body that extends from a tread portion over side wall portions up to bead cores of bead portions and ply lapelled portions that are lapelled from inside to outside in the tire axial direction around the bead cores, wherein each ply lapelled portion comprising of a main portion and a winding portion, the main portion being bent along an inner surface in the tire axial direction, a lower surface in the radial direction and an outer surface in the tire axial direction of the bead core, the winding portion continuing from the main portion and extending towards the ply main body portion upon separating from the top surface thereof in the radial direction at an angle that is smaller than 90 degrees, and the ply lapelled portion including one-side inclined region that extends up to an inflection R 0 that is located in a core lower surface opposing region and the other-side inclined region that extends from the inflection R 0 to a tip end Pa of the ply lapelled portion, wherein the core lower surface opposing region is a region in which carcass cords face to the lower surface of the bead core in the radial direction, the one-side inclined region extending while inclining to one side in the tire circumferential direction, the other-side inclined region extending while inclining to the other side in the tire circumferential direction, the one-side inclined region including a minimum angle position Q 1 within the core lower surface opposing region in which a cord angle α of the carcass cords with respect to the tire circumferential direction becomes a minimum value α 1 min, and the cord angle α increasing from the minimum angle position Q 1 in approaching the ply main body side and the inflection R 0 , the other-side inclined region including a minimum angle position Q 2 between the inflection R 0 and the tip end Pa of the ply lapelled portion in which the cord angle α becomes a minimum value α 2 min, and the cord angle α increasing from the minimum angle position Q 2 in approaching the inflection R 0 and the tip end Pa of the ply lapelled portion.