Abstract: A heavy duty radial tire and rim assembly exhibiting improved bead durability, wherein the bottom face of the bead is composed of an axially inner face Si and an axially outer face So each tapered axially inward to decrease the diameter of the bottom face, the taper in the inner face Si is greater than that of the outer face So, the boundary between the inner face Si and the outer face So is located axially inward of the center of gravity of the bead core, and in the condition that the tire is mounted on a regular rim and inflated to a regular pressure, the axial distance X of the axially inner edge Q2 of the bead core from a bead heel Q1 defined as an intersection between a rim base line B and an extending line of the inner surface of a rim flange of the rim is not less than 80% and not more than 105% of the height HR of the radially outer edge Q3 of the rim flange from the rim base line; and the radial distance Y of the radially outer edge Q4 of the bead core measured radially inwardly from the radially out

Abstract: A heavy duty radial tire and rim assembly exhibiting improved bead durability, wherein the bottom face of the bead is composed of an axially inner face Si and an axially outer face So each tapered axially inward to decrease the diameter of the bottom face, the taper in the inner face Si is greater than that of the outer face So, the boundary between the inner face Si and the outer face So is located axially inward of the center of gravity of the bead core, and in the condition that the tire is mounted on a regular rim and inflated to a regular pressure, the axial distance X of the axially inner edge Q2 of the bead core from a bead heal Q1 defined as an intersection between a rim base line B and an extending line of the inner surface of a rim flange of the rim is not less than 80% and not more than 105% of the height HR of the radially outer edge Q3 of the rim flange from the rim base line; and the radial distance Y of the radially outer edge Q4 of the bead core measured radially inwardly from the radially out

Abstract: A heavy duty radial tire and rim assembly comprising a pair of bead cores, a carcass, a belt, and a pair of bead apexes, wherein in at least one of the bead portions, when the tire is mounted on a normal rim specified for the tire and inflated to a normal pressure, a thickness center line of a carcass turnup portion between two points is cured and located axially inward of a straight line drawn between the two points, the quotient (X/HR) of the axial distance (X) of the inner end (Q2) of the bead core from a bead heel point (Q1), to the height (HR) of a flange of the normal rim is in a range of 0.8 to 1.05, wherein the bead heel point (Q1) is defined as in intersection of an extension of the outer surface of the bead portion with an extension of the bead base, and the quotient (Y/HR) of the radial distance (Y) from the radially outer end (Q3) of the flange of the rim to the radially outer end (Q4) of the bead core, to the height (HR) of the flange of the rim is in a range of 0 to 0.3.