A pneumatic tire comprises a carcass formed of a carcass ply extending between a pair of bead portions in a toroidal shape, and a bead core disposed in a respective one of the bead portions, the bead core comprising an axially inner core and an axially outer core respectively disposed on an axially inner side and the axially outer side of the carcass ply. The bead portion comprises an inner bead apex rubber extending radially outward from the inner core, and an outer bead apex rubber extending radially outward from the outer core. An outer apex height Ho from a bead base line to a outer end of the outer bead apex rubber is in a range of from 120% to 150% of an inner apex height Hi from the bead base line to the outer end of the inner bead apex rubber.

In a pneumatic tire, a bead core has end portions in a tire width direction formed as vertical lines along a tire radial direction. A length of the vertical lines is from 20% to 30% of a core height. In two adjacent bead core layers of first, second and third layers, the radial outer layer tire includes two or more bead cores more than the radially inner layer tire, and a misalignment amount between the bead wires each at an end portion on one side in the tire width direction is one-half of a bead wire thickness. A side on which the misalignment amount between the first and second layer bead wires is one-half of the thickness of the bead wire is opposite in the tire width direction to a side on which the misalignment amount between the second and third layer bead wires is one-half of the thickness of the bead wire.

A pneumatic tire includes a bead core including end portions in a width direction formed as a vertical line along a radial direction, the vertical line has a length of 31% to 45% of a core height, in two adjacent bead core layers of first, second and third layers of the bead core, the number of bead wires in the radially outer layer is larger by two or more than the number of bead wires in the radially inner layer, and a misalignment amount between bead wires located at an end portion on one side in the width direction is one-half of the bead wire, and a side on which the one-half misalignment amount between the bead wires in the first and second layers is opposite in the width direction to a side of the one-half misalignment amount between the second and third layer bead wires.

In a pneumatic tire, a turned back portion of a carcass layer contacts a body portion of the carcass layer in a cross-sectional view in a tire meridian direction to form a closed region surrounding bead cores. A rubber occupancy ratio in the closed region is in a range of 15% or less. The bead cores have a predetermined wire arrangement structure formed by arranging wire cross sections of bead wires in the cross-sectional view in the tire meridian direction. Additionally, a self-contact height (CH) of the carcass layer and a circumferential length (L) of the wire arrangement have a relationship 1.0CH/L10.0.

A pneumatic tire includes a bead core including end portions in a width direction formed as a vertical line along a radial direction, the vertical line has a length of 31% to 45% of a core height, in two adjacent bead core layers of first, second and third layers of the bead core, the number of bead wires in the radially outer layer is larger by two or more than the number of bead wires in the radially inner layer, and a misalignment amount between bead wires located at an end portion on one side in the width direction is one-half of the bead wire, and a side on which the one-half misalignment amount between the bead wires in the first and second layers is opposite in the width direction to a side of the one-half misalignment amount between the second and third layer bead wires.

A tire comprises a pair of flexible bead wires (51) of reduced mass. Each bead wire (51) has the form of a closed circumferential ring, bracing the bead of the tire (1) against the rim (100) and comprising a first part made of a first material M1 taking the form of textile cords (560), the first part interacting with a second part of the bead wire (51) made of a reinforcing second material M2; the tensile stiffness is comprised between 4.510.sup.5 N/m and 1.810.sup.6 N/m; the circumferential bending stiffness, Kf, is greater than or equal to Kr*(1000*D/(16*25.4)).sup.3, where D is the diameter of the wheel on which the tire is mounted, measured at the seat (110) of the rim (100) in meters, and where Kr is equal to 2.10.sup.2 N.Math.m.sup.2; and the elastic elongation is greater than or equal to 2%.