In a tire 2, a contour of an outer surface of the second apex 38 includes: a circular arc C2 that extends inward from an outer end, in the radial direction, of the contour and is convex outward in the axial direction; and a circular arc C3 that is located inward of the circular arc C2 in the radial direction, is in contact with the circular arc C2, and is convex inward in the axial direction. A difference (HtHw/2) between a height Ht from a bead base line to a contact point between the circular arc C2 and the circular arc C3 and a height that is half of a height Hw from the bead base line to a maximum width position is equal to or greater than 10 mm and equal to or less than 10 mm.

A run flat tire is provided having a line L1 connecting point P1 having height H1 of 17 mm; and point P2 at which a thickness from point P1 is minimum thickness Ts. Point C represents a point which is distant from point P2 on line L1 by a distance that is 0.4 times Ts. A point B represents a point of intersection of: line L2 that extends in the axial direction through radially outer end of core 36; and line L3 that extends in the radial direction through an axially outer end of core side portion 46a of turned-up portion 46. A line L4 passes through point C and point B. The thickness Ts is greater than or equal to 10 mm, and not greater than 17 mm. The turned-up portion 46 extends through a region surrounded by an axially outer surface of main portion 44, and lines L2-L4.

A pneumatic tire includes a pair of bead portions, a pair of bead cores each disposed in a respective one of the pair of bead portions, a carcass extending between the pair of bead cores, the carcass including a carcass ply that includes a main portion extending between the pair of bead cores and a pair of turn-up portions each turned up around a respective one of the pair of bead cores from axially inside to outside of the tire and extending outwardly in a tire radial direction, and a reinforcing rubber layer disposed in each bead portion and being adjacent to an axially outside of the turn-up portion, wherein the reinforcing rubber layer has a laminated body in which a plurality of sheet-shaped rubber members having different radial lengths are laminated in the tire axial direction.

Resistance to unseating of a tire operating at low pressure is achieved by a tire comprising at least one bead having an axial width at the seat D comprising at least one main circumferential reinforcing element (22) of which the radially innermost point (222) is at a radial distance Z and at an axial distance Y from the radially innermost point (211) of the bead, and such that Y/D is at least equal to 0.5 and Z/D is at most equal to 0.4. This same bead comprises at least one bead layer (23) surrounding the bead filler rubber (21) and such that its axially outermost end (231) is radially on the outside of the end (311) of the carcass layer (31) and it also comprises at least one additional circumferential reinforcing element (24), radially on the inside of the radially outermost point (223) of the main circumferential reinforcing element (22).

A pneumatic tire has two carcass layers including carcass cords are laid between a pair of bead portions, bead cores and bead fillers are disposed in the bead portions, and at least two belt layers are disposed on the outer circumferential side of the carcass layers, the tire being characterized in that both ends of the inner carcass layer are folded back from the tire inner side to the tire outer side around the bead cores, and the ends of the folded back portions of the inner carcass layer are disposed between the innermost belt layer and the outer carcass layer, while both ends of the outer carcass layer are disposed so as to pass between a main portion of the inner carcass layer and the bead fillers, and both ends of the outer carcass layer terminate at the bead portions without being folded back around the bead cores.

Tire including: a tread; a pair of sidewalls extending substantially inward radially from ends of the tread; a pair of beads positioned substantially radially inwardly of the sidewalls; and a clinch portion extending from the sidewalls to the beads. A concave curved surface extends on an outer surface of the clinch portion in a circumferential direction. A convex curved surface formed on a radially outer side end of a rim flange is engageable with the concave curved surface. A ratio R1/R of curvature radius R1 of the concave curved surface to a curvature radius R of the convex curved surface of the rim flange satisfies 1.7R1/R2.5. The curvature radii R1 and R of the concave and convex curved surfaces, respectively, are each a radius of curvature of an arc on a cross-section taken along a plane including a tire center axis.

A pneumatic tire 1 comprises a carcass 6 comprising a carcass ply (6A) comprising a main body portion (6a) and turned up portions (6b), and bead apex rubbers 8. Each of the bead apex rubbers 8 comprises a first rubber portion 10 and a second rubber portion 11 provided on an outer side in a tire axial direction of the first rubber portion and having smaller rubber hardness than the first rubber portion. A ratio H1/H2 of a height (H1) of an outer end (10e) in a tire radial direction of the first rubber portion 10 from a bead base line (BL) and a height (H2) of an outer end in the tire radial direction of each of the turned up portions (6b) from the bead base line (BL) is in a range of from 1.4 to 1.7.

A tire includes a carcass, and a wire chafer disposed on an outer circumference of the carcass. A reinforcement rubber layer having a lower elastic modulus than that of a coating rubber included in the carcass and/or that of a coating rubber included in the wire chafer, is arranged between the carcass and the wire chafer. In an area where the reinforcement rubber layer is arranged, the rotational angle around a bead core to outward in the tire width direction falls within at least a portion of the range of 45 to 90 with reference to a straight line which extends inward in the tire radial direction from the center of the bead core, which is orthogonal to the tire width direction, and which intersects with the wire chafer.

In a tire 2, chafers 8 each extend from a position axially outward of a corresponding one of beads 10 to a position radially inward of the corresponding one of the beads 10. Sidewalls 6 extend to positions between the beads 10 and the chafers 8, respectively. The chafers 8 extend to positions outward of ends 38 of turned-up portions 44 of a carcass ply 40 in the radial direction. When a side surface 50 represents a portion, of an outer surface of each chafer 8, which contacts with a flange of a rim, an outline of the side surface 50 has an arc C that extends from a heel of the bead 10 portion and projects inward.

A heavy duty pneumatic tire includes a clinch portion extending from the sidewalls to the beads. A concave curved surface extends on an outer surface of the clinch portion in a circumferential direction. A convex curved surface is engageable with the concave curved surface. A ratio R1/R2 of a radius of curvature of the concave curved surface to a radius of curvature of the convex curved surface, satisfies 1.7R1/R23.9, a ratio D1/R2 of a depth of the concave curved surface to the radius of curvature of the convex curved surface satisfies 0.05D1/R20.09, and the radius of curvature R1 of the concave curved surface and the radius of curvature R2 of the convex curved surface are each a radius of curvature of an arc on a cross section as taken along a plane including a center axis of the tire.