A pneumatic tire includes a bead portions and a bead core at the bead portions, the tire being mounted to a 15-tapered specified rim. The bead portions include a portion inward in a radial direction of an extension line of an inner circumferential surface of the bead core, the extension line extending in the lateral direction, that is positioned outward in the tire lateral direction of an imaginary line passing through a first intersection point between the extension line and a tire inner surface and extends inward in the tire radial direction from the extension line at an angle perpendicular to the extension line. An angle formed by the imaginary line and a line segment passing through a second intersection point between a bead base and the tire inner surface and the first intersection point between the extension line and the tire inner surface is from 0 to 25.

A pneumatic tire includes an up ply, a down ply, and a cord reinforcing layer. The up ply has: a main body section and a wound section. The down ply is provided on a tire outer surface side of the up ply. The cord reinforcing layer is provided from the inner side to the outer side in the tire axial direction of the bead core to cover the up ply, and has reinforcing cords. A tip of the wound section is located outward in a tire radial direction from a rim flange. An outer end in the tire axial direction of the cord reinforcing layer is located outward in the tire radial direction from a bead upper line and inward in the tire radial direction from the rim flange. The bead upper line extends from an outer surface in the tire radial direction of the bead core.

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.

The present invention provides a tire having improved bead endurance in which cords of a steel chafer are waved and the advancing direction of the waves of the steel chafer is perpendicular to the advancing direction of carcass cords, thereby minimizing cracks at an edge of the carcass. The tire having a chafer structure for enhancing bead endurance includes: a carcass having carcass cords; and a steel chafer covering the carcass and having a plurality of waved chafer cords.

The pneumatic tire comprises a tread portion, a pair of sidewall portions and a pair of bead portions. At least one of the bead portions is provided with at least one electronic component, a bead apex rubber extending radially outwardly from a bead core, and a bead reinforcing layer extending in the tire radial direction along the bead apex rubber. The bead reinforcement layer comprises a steel cord ply having a spliced portion where both circumferential end portions thereof are overlap-jointed. The electronic component is arranged away from the spliced portion in the tire circumferential direction, and located within the arranged range in the tire radial direction of the steel cord ply.

Tire comprising two beads comprising a bead wire and a carcass anchored around the two bead wires by turning back, a squat filler of small height, a sidewall stiffening reinforcement which is metallic, an outer strip of soft rubber compound, placed axially on the outside of the carcass and of the filler, and a protective layer of rubber compound, wherein the assembly formed by the stiffening reinforcement and the outer strip has a thickness EB(R) and the protective layer has a thickness EE(R), R being the distance with respect to the radially innermost point of the bead wire, and wherein the thicknesses EB(R) and EE(R) satisfy a set of geometric conditions.

Provided is a pneumatic tire in which fiber reinforced layers on an outer side of a steel reinforced layer in a width direction each include fiber cords arranged in one direction, the fiber cords being oriented to cross each other between layers, a radially outer end of one of the fiber reinforced layers being radially outward of a turned-up end portion of a carcass layer, a radially outer end portion of another one of the fiber reinforced layers being radially inward of the turned-up end portion and radially outward of a line segment (K). Radially inner end portions of the fiber reinforced layers are inward in the width direction of a line segment (J), and cord angles A and B of the fiber reinforced layers satisfy 20|A|45 or 70|A|90, and 20|B|45 or 70|B|90.

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.

A tire can include a pair of beads, a carcass, a pair of sidewall layers, and a belt. One carcass ply constituting the carcass can include a ply body and a pair of turned-up portions. A radial height of each turned-up portion can be not greater than 17% of a cross-sectional height of the tire. An average thickness F of the sidewall layer in a zone can satisfy the following formula (1) represented using a constant B, a cross-sectional width SW of the tire, and a width BW of the belt, and the constant B can satisfy the following formula (2) represented using an aspect ratio RA of the tire:

416(BW/SWB).sup.2+4F416(BW/SWB).sup.2+6,Formula (1):

and

B=0.84(0.49RA/100+1.22)Formula (2):.

Provided is a pneumatic tire in which fiber reinforced layers on an outer side of a steel reinforced layer in a width direction each include fiber cords arranged in one direction, the fiber cords being oriented to cross each other between layers, a radially outer end of one of the fiber reinforced layers being radially outward of a turned-up end portion of a carcass layer, a radially outer end portion of another one of the fiber reinforced layers being radially inward of the turned-up end portion and radially outward of a line segment (K). Radially inner end portions of the fiber reinforced layers are inward in the width direction of a line segment (J), and cord angles A and B of the fiber reinforced layers satisfy 20|A|45 or 70|A|90, and 20|B|45 or 70|B|90.