A pneumatic tire comprises: a bead portion provided with an inside bead apex rubber disposed between a turned up portion and a main portion of a carcass ply, and an outside bead apex rubber disposed axially outside the turned up portion and having a radially outer edge; and a the sidewall portion provided with a sidewall reinforcing cord layer disposed axially outside the carcass and having a radially inner edge which is spaced apart from the radially outer edge of the outside bead apex rubber by a radial distance of not less than 5% of a tire section height.

A tire having no ply turnup is described. The tire includes a tread, a single layer of ply, a first triangular shaped bead and a second triangular shaped bead, wherein the radially inner end of the single layer of ply is secured between the first bead and the second bead.

A run-flat tire includes: a pair of bead portions in which bead cores are embedded; sidewall portions that are continuous with tire radial direction outer sides of the bead portions; a carcass that extends across the pair of bead portions and has a body portion that is positioned between the bead cores and turn-up portions that are turned up from inside to outside about the bead cores; a belt layer disposed on a tire radial direction outer side of the carcass; a tread provided on a tire radial direction outer side of the belt layer; side reinforcing layers that are made of rubber, disposed on the tire inner side of the body portion, and configured so that a thickness of the side reinforcing layers gradually decreases toward the tread and the bead portions; and bead fillers that are made of resin and provided between the bead cores, the body portion, and the turn-up portions.

With a pneumatic tire not mounted on a rim, in a meridian cross-section a first line is parallel with an innermost bottom side of a bead core in a radial direction and passes through an outermost projection of the bead core in a lateral direction, a second line is orthogonal with the first line at the outermost projection, a third line is orthogonal with the first line and passes through an intersection of a rim cushion rubber, a distance between the second and third lines is 2.0 to 4.0 mm, a shortest distance between an innermost projection of the bead core in the lateral direction and a cord of a carcass layer is 0.6 to 1.4 mm, and a shortest distance between an innermost end of the bottom side of the bead core in the lateral direction and the cord of the carcass layer is 1.2 to 2.2 mm.

A heavy goods vehicle tire has a radial carcass reinforcement, made up of a single layer of metal reinforcing elements anchored in each of the beads by a turn-up around a bead wire. The turn-up of the carcass reinforcement layer and the main part of the carcass reinforcement layer are coupled, and a radiofrequency communication module is placed in the coupling region at the interface between the turn-up of the carcass reinforcement layer and axially outwardly adjacent layer of rubber compound.

A tire is equipped with a radiofrequency communication module with a carcass reinforcement comprising two carcass plies such that the communication module is positioned in the bead axially on the outside of and against the second carcass ply.

A vulcanizable composition for preparing bead filler, the composition comprising a vulcanized rubber; and a vinyl aromatic-containing block copolymer compound, where the vinyl aromatic-containing copolymer is defined by the formula II
d-Vo-D-V-II
where each V is independently a polyvinyl aromatic block, D is a polydiene block, w is a hydrogen atom, a functional group, or a polymeric segment or block, and where d is a polydiene block, and where the overall vinyl content of the block copolymer is greater than 65%.

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.

Of layers configuring a bead core of a pneumatic tire, the width W0 of one of the layers including the greatest number of rows, the width W1, W2 of other of the layers located respectively innermost and outermost in the radial direction satisfy W1>W2 and W20.5W0. The position of width W0 is inward in the radial direction of the center of the bead core. A carcass is folded and curved along the bead core and extends toward sidewalls where a folded back portion of the carcass contacts a body of the carcass. A rubber occupancy ratio in a closed region formed by the body and the folded back portion is 0.1% to 15%. The cross-sectional area S2 and hardness H2 of a filler outward of the carcass in the lateral direction, and the cross-sectional area S1 and the hardness H1 of the side reinforcing layer satisfy 0.12(S2H2)/(S1H1)0.50.

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.