In a tire 2, a length from a center in an axial direction of a boundary between a core 30 and an apex 32 of each bead 10 to an outer end PA of the apex 32 is not less than 10 mm and not greater than 15 mm. In a state where the tire 2 is mounted on a normal rim and an internal pressure of the tire 2 is adjusted to a normal internal pressure, a shape of a main body portion 36, of a carcass ply 34, which is located in a zone from a boundary portion between a tread 4 and each sidewall 6 to the outer end PA of each apex 32 is represented by a single circular arc, and a diameter of the circular arc is not less than 75% and not greater than 90% of a cross-sectional height of a carcass 14.

Disclosed is a pneumatic radial tire for a passenger car having ultra fine steel cords for a carcass ply in which adhesive force between a carcass ply layer and a side wall or a rim flange rubber adjacent to a turn up portion on an outside and a stiffness of the rim flange rubber are larger than a bending stiffness of the carcass ply layer so as to improve durability of a bead part while reducing poor air inletting generated at a carcass turn up portion.

A pneumatic tire includes: an air permeation preventive layer disposed in the inner surface of the tire; a belt layer buried in a tread part; and a cord layer formed by arranging a plurality of cords. The cord layer is disposed between the air permeation preventive layer and the belt layer, and extends to a bead part side further from a tire maximum width position. At least a part of the cord layer is located close to the outer surface of the tire, at a position closer to the bead part side than the tire maximum width position, so that the distance between the cords and the outer surface of the tire is not more than 2 mm.

A method for manufacturing an annular carcass of a tire includes providing first and second ply materials, each including cords; winding at least a layer of the first ply material and a layer of the second ply material onto a carcass drum so the first ply material radially surrounds the second ply material; arranging two cables onto the cylindrical carcass preform; turning the part of the cylindrical carcass preform about the closer cable onto the part of the cylindrical carcass preform between the two cables; and expanding the cylindrical carcass preform to form an annular carcass having, in a bead area, inner and outer layers of the first ply material and inner and outer layers of the second ply material. The ply materials are arranged so the cords thereof are arranged cross-wise with respect to its neighboring ply materials or a neighboring ply material, considering the innermost or outermost layer.

A tire includes a bead portion with a bead core having a main bead filler and an auxiliary bead filler, and a carcass ply wrapped around a portion of the main bead filler. An end of the carcass ply is located axially outside the main bead filler and radially below an apex of the main bead filler. The auxiliary bead filler is located axially outside the carcass ply end, with an apex of the auxiliary bead filler being located above an apex of the main bead filler.

A pneumatic tire with a reinforcement material includes: a tread that comes in contact with a road surface; side walls that extend and form shoulders and inner liners at both sides of the tread; a carcass that is integrally attached to the tread and the inner sides of the side walls and forms a turn-up head at both ends of the side walls; a belt layer that is layered on the tread of the carcass; and a bead that includes a bead core inserted in a wheel inside the turn-up head, a bead filler inserted in a side of the tread of the bead core, and a reinforcement material inserted in an interface of the turn-up head.

Pneumatic tyre having a toroidal carcass, which has a body ply that is partially folded onto itself and therefore having two lateral flaps; two annular beads, each of which is surrounded by the body ply and has a bead core and a bead filler; an annular tread; a pair of sidewalls; a pair of abrasion gum strips; an innerliner which is impermeable to air and is arranged within the body ply; and a transponder which is arranged between the body ply and the innerliner at a flap of the body ply and is arranged at a distance of less than 7 mm from an edge of the body ply.

Improving endurance of bead of radial tire for heavy vehicle. Tire has two beads (2) contacting rim (3) connected by carcass reinforcement (4) having carcass layer (5), with main part (6) wrapped, in each bead (2), axially from inside towards outside of the tire, around bead wire (7) having diameter (L), to form turnup (8) having free end (E). Each bead (2) has filling element (9) with filling compound (10) and extending radially towards outside from bead wire (7) and axially between turnup (8) and main part (6). The distance (I) between turnup (8) and main part (6) decreases continuously from bead wire (7) as far as a first minimum distance (a) reached at a first point (A) of turnup (8), then increases continuously from the first point (A) of turnup (8) as far as a first maximum distance (b) reached at a second point (B) of turnup (8).

A pneumatic tyre includes a tread portion, two axially spaced sidewall portions extending radially inwardly from the tread portion, at least one of the sidewall portions being provided with a side protector that protrudes axially outwardly and having an inner end located radially outwardly of a tyre-maximum-width position, and two axially spaced bead portions connected to radially inward of the respective sidewall portions. Each bead portion includes a bead apex rubber having an outer end in the tyre radial direction being located radially inwardly of the tyre-maximum-width position. A radial length of a tyre inner region from a bead baseline to the outer end of each bead apex rubber is in a range of from 0.8 to 1.2 times a radial length of a tyre outer region from a radially outermost position of the tread portion to the inner end of the side protector.

A pneumatic tire may have an outboard bead portion oriented on an outboard side of the tire, an inboard bead portion oriented on an inboard side of the tire, an outboard sidewall portion oriented on the outboard side of the tire, an inboard sidewall portion oriented on the inboard side of the tire, an outboard shoulder portion oriented on the outboard side of the tire, and at least one body ply. The body ply may extend about the outboard bead portion and have a first turnup that extends to at least the outboard shoulder portion. The body ply may extend about the inboard bead portion and have a second turnup that extends to, and terminates in, the inboard bead portion or the inboard sidewall portion, wherein the first turnup height is greater than the second turnup height. At least one belt may be oriented radially outward of the body ply.