Pneumatic tire

A pneumatic tire mountable on a 15° tapered specified rim, the pneumatic tire comprising:

• a pair of bead portions disposed on either side of a tire equatorial plane in a tire lateral direction;
• a bead core provided in each of the pair of bead portions, the bead core having a hexagonal shape when viewed in a meridian cross-section;
• a carcass supported by the bead core provided in each of the pair of bead portions, the carcass comprising a carcass body portion and a carcass folded back portion formed by the carcass folding back at the bead core;
• a steel cord reinforcing layer disposed on an outer surface of the carcass folded back at the bead core;
• and
• a bead rubber layer with at least a portion thereof disposed between the carcass body portion and the carcass folded back portion;
• when the pneumatic tire is not mounted on the specified rim,
• a distance from a second line segment to a third line segment being from 4 mm to 8 mm,
• wherein a first line segment passing through an outermost projecting point of the bead core in the tire lateral direction and being parallel with a longest side of the bead core, a side of a bead base portion closer to a bead heel that is a portion of the bead portion that comes into contact with the specified rim, a curved line of a tire outer surface that is a portion of the bead portion that is located outward from the bead base portion in the tire lateral direction, a first intersection point of the side and the curved line, the second line segment passing through the first intersection point and being perpendicular to the first line segment, and the third line segment passing through the outermost projecting point and being perpendicular to the first line segment are specified,
• a ratio R2/R1 being from 0.935 to 0.975, wherein R2 is a tire radius at a bead toe of the bead base portion, and R1 is a tire radius at the bead heel, and
• a ratio R1/R3 is from 0.985 to 0.995, wherein R3 is a tire radius at the bead core and R1 is the tire radius at the bead heel,
• wherein the bead base portion comprises an outer portion comprising the bead heel and an inner portion comprising the bead toe, and
• an angle of a side of the outer portion with respect to a line perpendicular to the tire equatorial plane is from 18° to 23°, an angle of a side of the inner portion being from 27° to 33°.