<p>A heavy duty radial tyre comprising a pair of bead cores (2) a carcass (7) a belt (12) a pair of bead apexes (10) wherein in at least one of the bead portions, when the tyre is mounted on its normal rim as specified and inflated to a normal pressure the ratio (X/HR) of the axial distance (X) of the inner end (Q2) of the bead core (2) from a bead heel point (Q1) to the height (HR) of rim a flange (9b) is in the range of 0.8 to 1.05, where the bead heel point (Q1) is defined as the intersection fo an extension of the outer surface of the bead portion with an extension of the bead base, and the ratio (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.</p>
