A pneumatic tire comprises bead portions each having a bead core therein. Each of the bead portions has an outer side surface which is to be in contact with a standard rim on an outer side in a tire axial direction of the bead core. In a tire meridian section of the pneumatic tire in a pre-mounted state, a distance in a tire radial direction between an inner end in a tire radial direction of the bead core and a bead toe is larger than 0.5 times and smaller 2.5 times a maximum width in the tire axial direction of the bead core.

A tire 22 includes a pair of bead portions 66 to be fitted to a rim R. Each bead portion 66 includes a bead 30 having a core 52 and an apex 54. An outer surface 68 of the bead portion 66 includes a seat face 70 and a flange face 72 disposed radially inward and axially outward, respectively, of the bead 30, a heel face 74 disposed between the seat face 70 and the flange face 72, and a plurality of vent lines 78 projecting from the heel face 74 and extending in the circumferential direction. A contour of the heel face 74 is represented by an arc on a cross-section, of the tire 22, taken along a plane including a rotation axis of the tire 22, and a radius Rh of the arc is not less than 8 mm and not greater than 15 mm.

In this pneumatic tire, the bead core has a predetermined wire array structure obtained by arranging wire cross-sections of bead wires in a cross-sectional view in a tire meridian direction. The following are defined in the wire array structure: a tangent line that contacts, from the side of a rim fitting face, an innermost layer in the tire radial direction and the wire cross-section on the innermost side and the outermost side in the tire lateral direction; contact points of the tangent line with respect to the wire cross-sections on the innermost side and the outermost side; a middle point of the contact points; and gauges in the tire radial direction from the contact points and middle point to the rim fitting face. In this case, the change rates of the gauges before and after rim assembly each are in the range of 10% to 60%.

A pneumatic tyre comprises a tread portion, a pair of opposing sidewall portions and a pair of opposing bead portions, the tread portion extending radially outwards from the sidewall portions and the sidewall portions extending radially outwards from the bead portions, wherein each bead portion comprises an axially inward side and an axially outward side which are joined at a base of the bead portion and each axially outward side of the bead portion comprises a concave region extending axially inwards. Each concave region further comprises a convex region located within the concave region which extends axially outwards.

A pneumatic tire mountable on a 15° tapered specified rim includes a bead core, a carcass, a steel cord reinforcing layer, a bead rubber layer, and a first reinforcing rubber layer. A distance from a second line segment to a third line segment is from 4 mm to 12 mm, a complex modulus of the first reinforcing rubber layer is from 6 MPa to 10 MPa, an elongation at break of the first reinforcing rubber layer is from 300% to 450%, a complex modulus of the second reinforcing rubber layer is from 10 MPa to 15 MPa, and a complex modulus of a shock absorbing rubber layer is from 2 MPa to 6 MPa.

A pneumatic tire is provided. In a meridian cross-section, an external contour shape of the bead core is a polygon formed by common tangent lines of a plurality of circumferential portions of a bead wire, the external contour shape includes a single vertex located toward the outside in a tire radial direction, an internal angle formed by two sides sandwiching the vertex is an acute angle, a bottom side of the external contour shape is inclined with respect to the tire lateral direction by from 2° to 9°, and the carcass layer is bent and folded back along a circumference of the bead core in a bead portion, a folded back portion of the carcass layer from a position of an outer end of the bead core in the tire radial direction extends toward a sidewall portion in contact with a body portion.

A pneumatic tire mountable on a 15° tapered specified rim includes a bead core, a carcass, a steel cord reinforcing layer, a bead rubber layer, and a first reinforcing rubber layer. A distance from a second line segment to a third line segment is from 4 mm to 8 mm; a side of an outer portion and a side of an inner portion of a bead base portion bend at an inflection point located in a range from 8 mm to 18 mm from the first intersection point; and an angle γ formed by an extension line drawn from the side of the outer portion inward in the tire radial direction and the side of the inner portion is from 4.5° to 14.5°.

A motorcycle tire includes a pair of bead portions each with a bead core therein, the pair of bead portions including a pair of rim contact surfaces that comes into contact with a standard wheel rim under a standard-rim mounted condition. Each rim contact surface includes a bead bottom surface, a bead side surface, and a bead heel surface connecting the bead bottom surface and the bead side surface. Under a virtual-rim mounted condition, in at least one of the pair of bead portions, a diameter of an intersection of a virtual first straight line expanded outwardly in the tire axial direction from the bead bottom surface and a virtual second straight line expanded inwardly in the radial direction from the bead side surface is 99.0% to 99.6% of a rim diameter of the standard wheel rim.

In this pneumatic tire, the bead core has a predetermined wire array structure obtained by arranging wire cross-sections of bead wires in a cross-sectional view in a tire meridian direction. The following are defined in the wire array structure: a tangent line that contacts, from the side of a rim fitting face, an innermost layer in the tire radial direction and the wire cross-section on the innermost side and the outermost side in the tire lateral direction; contact points of the tangent line with respect to the wire cross-sections on the innermost side and the outermost side; a middle point of the contact points; and gauges in the tire radial direction from the contact points and middle point to the rim fitting face. In this case, the change rates of the gauges before and after rim assembly each are in the range of 10% to 60%.

A pneumatic tire is provided. In a meridian cross-section, an external contour shape of the bead core is a polygon formed by common tangent lines of a plurality of circumferential portions of a bead wire, the external contour shape includes a single vertex located toward the outside in a tire radial direction, an internal angle formed by two sides sandwiching the vertex is an acute angle, a bottom side of the external contour shape is inclined with respect to the tire lateral direction by from 2° to 9°, and the carcass layer is bent and folded back along a circumference of the bead core in a bead portion, a folded back portion of the carcass layer from a position of an outer end of the bead core in the tire radial direction extends toward a sidewall portion in contact with a body portion.