A tire includes a tread, a sidewall extending from one edge of the tread approximately in a radially inward direction to a bead structure, and a carcass extending along an axially inner side of the sidewall to the bead structure. The carcass includes a first ply and a second ply extending radially inward from the sidewall to a terminal end directly adjacent the bead structure. The bead structure includes a circumferentially extending bead core axially inward of the sidewall, a chafer extending radially inward toward the bead core, an apex abutting the bead core, and an inner stiffener member disposed between the first ply and the apex, the inner stiffener member extending radially outward from a location proximate the bead core to a location radially outward from the apex.

A ply of a carcass of a pneumatic radial tire includes a turn-up ply and a down ply. The turn-up ply includes: a main body portion disposed between a pair of bead cores; turn-up portions around the bead cores from an inside toward an outside in a tire width direction. The down ply extends up to an inside in a radial direction of the bead cores so as to cover the turn-up ply including the turn-up portions from an outside. A curvature is formed at either one of a down ply predetermined portion of the down ply, which covers a turn-up end portion of the turn-up portion of the down ply from an outside in the tire width direction, and a turn-up ply portion that covers the turn-up end portion of the turn-up portion in the main body portion of the turn-up ply from inside in the tire width direction.

When a tire that is mounted on a specified rim, inflated to an internal pressure of 50 kPa, and placed in a no-load state is viewed as a cross-section from the tire meridian direction, a position of 1.30Hf on an outer surface of a sidewall portion, taking a rim flange height (Hf) of the specified rim as a reference, is defined as a point (P), a foot of a normal line (L) drawn from the point (P) to a carcass line of a main body portion (131) of a carcass layer (13) is defined as a point (M), and a point of intersection of the normal line (L) and a carcass line of a folded back portion (132) of the carcass layer (13) is defined as a point (T). At this time, a distance (a) mm from the point (M) to the point (T), a distance (b) mm from the point (T) to the point (P), and a specified load (x) kN have relationships such that a=0.019x+13.3 and b=0.052x+21.6, with a tolerance of not less than 0% and not more than 20%.

In a tire 22, a length from a center PM in an axial direction of a boundary 60 between a core 48 and an apex 50 to an outer edge PA of the apex 50 is not less than 10 mm and not greater than 15 mm. In a state where the tire 22 is mounted on a normal rim and an internal pressure of the tire 22 is adjusted to 10% of a normal internal pressure, a main body portion 54 of a carcass ply 52 extending along an inner surface 62 of the apex 50 is tilted relative to the axial direction, and an angle of the main body portion 54 relative to the axial direction is not less than 40 and not greater than 60.

Disclosed herein is a bead reinforcing device for pneumatic tires, which includes a bead forming a circumference of a tire as a portion where the tire is in contact with a wheel, a carcass formed to cover the bead from its inside to its outside and forming an entire frame of the tire, and a bead stiffener formed to cover an entire outer surface of the bead.

A pneumatic tire (1) having: a toroidal carcass (2), which consists of a body ply (3) partially collapsed onto itself and therefore having two lateral flaps; two annular beads (4), each of which is surrounded by the body ply (3) and has a bead core (5) and a bead filler (6); an annular tread (7); a pair of sidewalls (11) arranged externally to the body ply (3) between the tread (7) and the beads (4); a pair of abrasion gum strips (12) arranged externally to the body ply (3) under the sidewalls (13) and at the beads (4); and a transponder (13) which is arranged in contact with the body ply (3) at a flap of the body ply (3) and is located below an edge (19) of the body ply (3) between the edge (19) of the body ply (3) and the bead (4).

A tire includes a circumferential tread, a pair of sidewalls, and a pair of bead portions. Each bead portion includes a bead and a bead filler having an apex. The tire also has a body ply extending from bead portion to bead portion. The body ply includes a pair of turn up portions radially outside of a respective bead portion. The tire further has a pair of wire reinforcements. Each wire reinforcement wraps around a respective bead and at least a portion of the body ply. The tire also includes a pair of reinforcement fillers. Each reinforcement filler has an inner surface in contact with an outer surface of a respective bead filler. A bottom end of each reinforcement filler is disposed radially above a top end of a respective wire reinforcement. The tire further includes an electronic device disposed radially below the apex of the bead filler of one of the pair of bead portions.

A pneumatic tire includes: bead cores formed by winding bead wires in a ring shape and having a polygonal cross-section shape in a meridian cross-section; a carcass extended between bead portions on both sides in a width direction, the carcass being folded back to an outer side in the width direction of the bead portion, the carcass being formed by coating a carcass cord with a coating rubber; an inner organic fiber reinforced layer wound around the bead core and formed by coating an organic fiber cord with a coating rubber; and a rubber reinforcing layer between the inner organic fiber reinforced layer and the carcass to cover at least an apex on an innermost side of the bead core in the width direction. A shortest distance between the bead wire and the carcass cord is 3 mm or more.

A tire having reduced mass and low rolling resistance and a method of manufacture thereof achieves reduced weight by using thin layers of thermoplastic polyurethanes (TPU's) to heat seal the carcass, breaker, and tread layers of the tire to each other, rather than embedding the layers in conventional, relatively thicker and heavier layers of sulfur cured vulcanized carbon filled elastomers. Creep and spring-back of the thermoplastic polyurethanes during cure is avoided by maintaining the adhered layers under pressure until the assembly cools below its glass transition temperature. In embodiments, the heat sealing can be performed on the forming drum, and in some embodiments cool rollers are applied to the heat-sealed carcass so as to accelerate the cooling to below the glass transition temperature.

A tire has a form of a torus that is open radially on an inside portion. The tire includes inner and outer walls, a crown, two sidewalls, two beads, a crown reinforcement, and a carcass reinforcement anchored in the beads and extending at least from the beads as far as the crown. The inner wall is covered at least in part with an airtight layer, and the airtight layer is covered at least in part with a layer of a self-sealing product. Each of the beads includes an annular reinforcing structure, with each annular reinforcing structure being formed of a plurality of windings of a single metal thread. The windings are arranged in a plurality of radially superposed layers, with each layer having a group of the windings arranged axially in a side by side manner, such that the superposed layers have a hexagonal cross section.