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 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.

The pneumatic tire comprises a pair of bead cores, a pair of bead fillers disposed outward of the pair of bead cores in a tire radial direction, a carcass layer disposed folded around the bead cores and the bead fillers, and a steel chafer including an arranged plurality of steel cords, the steel chafer being disposed between the carcass layer and a rim engaging surface. A height Hs of an outer end portion of the steel chafer located outward of the bead fillers in a tire width direction and a rim flange height Hf have the relationship: 0.5Hs/Hf1.0, where the height is measured from a measuring position of a rim diameter.

A heavy-duty pneumatic tire includes a carcass ply including a main portion extending between bead cores and a pair of turn-up portions, a first reinforcing layer of a steel cord disposed in each bead portion in a U-shaped manner, and a second reinforcing layer of an organic fiber cord disposed in each bead portion and at least a part of the second reinforcing layer extending in a radial direction of the tire at an axially outward location of the first reinforcing layer. The second reinforcing layer includes an axially inner second ply and an outer second ply. The outer second ply has an inner end positioned below the bead core. The inner second ply has an inner end located axially inward of the inner end of the outer second ply, and has a substantially same length as the outer second ply in a tire cross-section.

An object is to improve the durability of the stiffener having a hard rubber member and a soft rubber member formed on the radially inner side and the radially outer side by laminating rubber strips. A tire includes bead cores, stiffeners provided on the outer circumferences of the bead cores, and a carcass ply. Ends of the carcass ply are disposed on the stiffeners. Each stiffener includes an inner rubber portion on the radially inner side, an outer rubber portion on the radially outer side, and a cover tape. The inner rubber portion is formed by laminating a first rubber strip. The outer rubber portion is formed by laminating a second rubber strip. The second rubber strip is composed of rubber having a lower rigidity than the inner rubber portion. The cover tape covers a part of the stiffener that comes into contact with the end of the carcass ply.

A pneumatic tire includes a tread portion, sidewall portions, a pair of bead portions embedded with bead cores, and a carcass. The carcass includes a turned up ply including a main body portion extending between the bead cores, and a pair of turned up portions turned up around the bead cores from axially inside to outside. Each bead portion is provided with an inner apex rubber extending radially outward from the bead core between the main body portion and the turned up portion and an outer apex rubber arranged axially outside the turned up portion. The inner apex rubber has a radial height of from 18 to 30 mm. A buttress thickness D, a maximum width thickness E, and a bead thickness F satisfy expressions E4.5 mm, F9.0 mm, E/D=0.6 to 0.9, and F/E=1.7 to 2.2.

In a pneumatic tire including a bead core, a first bead filler on an outer circumference of the bead core, a carcass turned up from an inner side to an outer side around the bead core and the first bead filler), and a second bead filler on an outer side of a turned up portion of the carcass, a height of an upper end of the first bead filler is 10%-30% of a cross-sectional height, a turned up end of the carcass is on a radially outer side of a maximum width position, an upper end of the second bead filler is between the upper end and the turned up end, the second bead filler has a shape tapered toward the radially outer side, and thicknesses G1 to G3 of the second bead filler at predetermined positions satisfy 0.5G2/G10.8 and 0.4G3/G10.6.

Provided is a tire 2 that can achieve reduction of rolling resistance while reducing a decrease in durability to be small. An apex 32 of each bead 10 includes an apex body 48, a strip apex 50, and an intermediate apex 52. An inner end of the strip apex 50 is located between a ply body 38a of a carcass ply 38 and the apex body 48. An inner end of the intermediate apex 52 is located between the strip apex 50 and the apex body 48. An outer end of the apex body 48 is located between the inner and outer ends of the intermediate apex 52. The intermediate apex 52 is located between the inner and outer ends of the strip apex 50. The intermediate apex 52 is harder than the apex body 48, and the strip apex 50 is harder than the intermediate apex 52.

A pneumatic tire includes a circumferentially continuous recess in at least one sidewall outer surface. In a meridian cross-section, an area A of a region surrounded by outlines of the sidewall and a bead and a tangent line, an area S of a region surrounded by the outlines of the sidewall and the bead, a carcass body, a perpendicular line L2, a perpendicular line L3, and a thickness G1 of a bead filler measured along the perpendicular line L2 satisfy 0.10(G117)A/(S+A)0.05(G110), the tangent line being straight and contacting the outlines of the sidewall and the bead, a contact point being where the tangent line and the sidewall outline contact, the perpendicular line L2 being straight and passing through a turned-up edge of a carcass and perpendicularly intersecting the carcass body, the perpendicular line L3 being straight and passing through the contact point and perpendicularly intersecting the carcass body.

A pneumatic tire includes a tread portion extending in a circumferential direction and having an annular shape, a pair of sidewall portions respectively disposed on both sides of the tread portion, and a pair of bead portions respectively disposed on inner sides of the sidewall portions in a radial direction. A bead filler is disposed on an outer periphery of a bead core of each bead portion, a carcass layer is mounted between the pair of bead portions, and the carcass layer is turned up around the bead core from a tire inner side to a tire outer side. A transponder is embedded between the bead filler and the carcass layer, and a distance from an outer surface of the transponder to an outer surface of the bead filler measured in a normal line direction of the carcass layer ranges from 2 mm to 20 mm.