A pneumatic tire includes a tread, sidewalls, clinches, beads, a carcass, and strips. Each bead includes a core, a first apex and a second apex, the carcass includes a carcass ply which is turned up around the core from the axially inner side toward outer side such that the carcass ply is divided into a main portion and a turn-up portion, each strip has radially inner edge positioned between the main and turn-up portions, the second apex is positioned between the turn-up portion and each clinch, each strip has outer edge positioned to correspond to or on inner side of a point of maximum width of the tire in radial direction, the second apex has outer edge positioned on radially inner side of the outer edge of each strip, and the second apex includes crosslinked rubber and has complex elastic modulus in range of from 60 MPa to 70 MPa.

In one general aspect, the present disclosure provides a bead-apex assembly for a vehicle tire. The bead-apex assembly may include a bead with an outer diameter surface, and an apex with a first layer and a second layer, the first layer having an inner diameter located adjacent to the outer diameter surface of the bead, and the second layer having an inner diameter located adjacent to an outer diameter of the first layer.

Disclosed is a tire (1) which comprises: a bead core (10); a first bead filler (20); a first carcass (30); a second bead filler (40); and a rubber chafer (50) disposed at the outer side of the second bead filler (40) in the tread width direction. The second bead filler (40) covers a first bead filler outer end part (23) in the tread width direction, and a second bead filler inner end part (48) is disposed outside the bead core (10) in the tire radius direction. The rubber chafer (50) covers the second bead filler (40) in the tread width direction, and the loss tangent of the second bead filler (40) is smaller than the loss tangent of the rubber chafer (50).

The invention relates to improving the endurance of the beads of a radial tire for a heavy vehicle of construction plant type by reducing the cracking that starts on the axially outer face of the turn-up and spreads through the polymer coating and filler materials. According to the invention, a transition element made of a polymer transition material, is in contact, via its axially inner face, with the polymer coating material of the axially outer face of the turn-up and, via its axially outer face, with the polymer filler material, and the elastic modulus at 10% elongation of the polymer transition material is somewhere between the respective elastic moduluses at 10% elongation of the polymer coating material and of the polymer filler material.

A pneumatic tire having a designated orientation for mounting to a vehicle includes a tread, sidewalls, beads including bead cores, respectively, and a carcass including a carcass ply. Each bead includes a rubber apex, an outer bead and an inner bead, the rubber apex includes an outer apex portion and an inner apex portion, the outer apex portion includes a first outer apex portion positioned inward from the carcass ply in the axial direction and a second outer apex portion positioned outward from the carcass ply in the axial direction, the inner apex portion includes a first inner apex portion positioned inward from the carcass ply in the axial direction and a second inner apex portion positioned outward from the carcass ply in the axial direction, and the second outer apex portion has height which is greater than height of the second inner apex portion in the radial direction.

A contour CL of a carcass 12 includes a curved portion 44 and an inversely curved portion 46. A boundary between the curved portion 44 and the inversely curved portion 46 is an inflection point PV. A part or an entirety of the curved portion 44 is represented by a first arc. A part or an entirety of the inversely curved portion 46 is represented by a second arc. The first arc and the second arc are tangent to each other at the inflection point PV. A ratio (X/W) of a distance X in an axial direction to a distance W in the axial direction is not less than 70% and not greater than 85%. A ratio (Y/H) of a distance Y in a radial direction to a distance H in the radial direction is not less than 15% and not greater than 22%.

A pneumatic tire 1 has a bead portion provided with a reinforcing rubber portion disposed adjacently to the axially outer side of a carcass. The reinforcing rubber portion comprises an axially inner rubber layer and an axially outer rubber layer. The radially outer end of the axially outer rubber layer is positioned radially outside the radially outer end of the axially inner rubber layer. The radially inner end of the axially outer rubber layer is positioned radially inside the radially inner end of the axially inner rubber layer.

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.

A pneumatic tire includes a run-flat reinforcing layer disposed on an inner side in a width direction of a carcass layer, and a second filler disposed between a turned back portion of the carcass layer and a rim cushion rubber. Additionally, a point on a tire outer circumferential surface is defined, the point is located at a position corresponding to 150% of a rim flange height from a measurement point of a rim diameter of a specified rim, a perpendicular line is defined, and the perpendicular line is drawn from the point to a tire inner circumferential surface. A rubber gauge (G1) of the run-flat reinforcing layer on the perpendicular line, and a rubber gauge (G2) of a region from the turned back portion of the carcass layer to a tire outer surface have the relationship 0<G1/G20.65.

In a pneumatic tire 2 according to the present invention, in the vicinity of a bead 10 portion, a main portion 42 of a carcass ply 40 is passed through the vicinity of a neutral surface. A tensile force and a compressive force applied to the main portion 42 are small. In the tire 2, occurrence of pinch cut is suppressed. In addition, this structure alleviates a force applied to the main portion 42 even during run-flat running. In the tire 2, damage is less likely to occur even during run-flat running for a long period of time. The tire 2 has excellent run-flat durability. Furthermore, in the tire 2, an increase in the vertical stiffness constant or weight thereof is suppressed.