Heavy duty pneumatic radial tires with bead portion reinforcing layer having multiple inclination angles

A heavy duty pneumatic radial tire comprising a carcass of one or more rubberized cord plies extending between a pair of bead cores each embedded in a bead portion and containing cords arranged along a plane inclusive of a rotating axial center of the tire, at least one of which plies being wound around the bead core in each bead portion from an inside of the tire toward an outside thereof to form a turnup portion, and a bead portion reinforcing layer comprised of separately independent rubberized steel cord layer segments covering the at least one carcass ply inclusive of its turnup portion in the bead portion, in which said bead portion reinforcing layer is comprised of three independent rubberized steel cord layer segments consisting of an inner reinforcing layer segment arranged at an inside region side the carcass ply facing the inside of the tire, an outer reinforcing layer segment arranged at an outside region side of the turnup portion of the carcass ply, and a middle reinforcing layer segment arranged around the bead core between the inner reinforcing layer segment and the outer reinforcing layer segment, and an outer end of the outer reinforcing layer segment in the radial direction extends over an end of the turnup portion of the carcass ply, and opposed ends among the three rubberized steel cord layer segments are arranged so as to be adjacent to each other in the vicinity of the bead core, and an inclination angle of steel cords in the bead portion reinforcing layer with respect to a circumferential line of the tire is within a range of 15-30° at an outer end portion of each of the outer and inner reinforcing layer segments in the radial direction of the tire and within a range of 35-60° at an inner end portion thereof and an inclination angle of steel cords in the middle reinforcing layer segment is made larger than the inclination angle of steel cords at the inner end portion of each of the above outer and inner reinforcing layer segments.