A pneumatic tire comprises a carcass which comprises a carcass ply composed of a main portion extending between bead portions and a pair of turned-up portions turned-up around respective bead cores. The bead portion is provided with: a primary bead apex rubber disposed between the carcass-ply main portion and the carcass-ply turned-up portion; an insulation rubber layer extending radially outwardly through between the carcass-ply main portion and the carcass-ply turned-up portion; and a subsidiary bead apex rubber layer disposed on the axially outside of the carcass-ply turned-up portion. The radially outer edge of the insulation rubber layer is located radially outside the radially outer edge of the subsidiary bead apex rubber layer. The complex elastic modulus of the insulation rubber layer is equal to or greater than the complex elastic modulus of the topping rubber of the carcass ply.

In this pneumatic tire, the bead core has a predetermined wire array structure obtained by arranging wire cross-sections of bead wires in a cross-sectional view in a tire meridian direction. The following are defined in the wire array structure: a tangent line that contacts, from the side of a rim fitting face, an innermost layer in the tire radial direction and the wire cross-section on the innermost side and the outermost side in the tire lateral direction; contact points of the tangent line with respect to the wire cross-sections on the innermost side and the outermost side; a middle point of the contact points; and gauges in the tire radial direction from the contact points and middle point to the rim fitting face. In this case, the change rates of the gauges before and after rim assembly each are in the range of 10% to 60%.

A tire design for a heavy-duty vehicle of construction plant type has a crown reinforcement (40) radially on the inside of a tread (10) and radially on the outside of a carcass reinforcement (70). The carcass reinforcement (70) has at least two carcass layers (50, 60) having metal reinforcers coated in an elastomer compound. The carcass layers (50, 60) have respective stiffnesses per unit width R1, R2. Metal reinforcers of a first carcass layer (50) form, with the circumferential direction (XX′), an angle A1, and those of the second carcass layer form an angle A2, such that the angles A1 and A2, and the stiffnesses R1 and R2, simultaneously satisfy the following three relationships: R1*sin 2(2*A1)+R2*sin 2(2*A2)≥(R1+R2)*) sin 2(30°), and ∥A1|-|A2∥<10°, and 0.7≤R1/R2≤1.3. The metal reinforcers have a critical compression buckling deformation DF at least equal to 2.5% and a compression elastic modulus MC at least equal to 10 GPa.

A tire that may improve pressure resistance and cut resistance. The tire is provided with a tire carcass member fabricated of resin and a reinforcing layer. The tire carcass member includes a bead portion covering a bead core, a side portion extending to a tire radius direction outer side from the bead portion, and a crown portion extending to a tire width direction inner side from the side portion. The reinforcing layer is provided with a plurality of cords that are covered with resin or rubber, extends from the bead portion of the tire carcass member toward the side portion, and covers at least an outer periphery face of the side portion.

Provided is a pneumatic radial tire for an aircraft including a bead core, a radial carcass and a stiffener, the radial carcass including one or more turn-up plies and one or more down plies, wherein in tire axial direction cross-sectional view, when an intersection point of a virtual circle with a ply closest to a tire axial direction inner side of the stiffener among the plies intersecting with the virtual circle having a radius that is twice as large as a diameter D of the bead core from a center O of the bead core is a point A, an intersection point of the virtual circle with a ply closest to a tire axial direction outer side of the stiffener is a point B, and a midpoint between the point A and the point B is a reference point C, then a line segment OC connecting the center O of the bead core to the reference point C has an inclination angle θ of 17° or less to a tire radial direction line passing the center O of the bead core on the tire axial direction outer side.

There is provided an pneumatic tire including a pair of left and right beads each including a bead core and a bead filler, and a carcass ply extending between the pair of beads, wherein the carcass ply is wound up around the bead core from the outside to the inside in the widthwise direction of the tire, and an end portion of the wind-up portion of the carcass ply is provided with notches at a plurality of positions in the circumference direction of the tire.

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.

A tire including a bead core; bead filler; upper ply; reinforcement ply which is provided to overlap a tire-radial direction inside portion of the upper ply; and down ply which overlaps a turnup part of the upper ply and reinforcement ply, and extends from an outer side in the tire-radial direction to an inner side in the tire-radial direction so as to encompass the bead core and bead filler together with the upper ply, in which an electronic component is embedded in a region of substantially triangular shape in a cross section surrounded by the turnup part of the upper ply, down ply and an end part of the reinforcement ply.

A tire for a two-wheeled automotive vehicle includes a carcass that is extended on and between one of beads and the other of the beads along inner sides of a tread and sidewalls. The carcass includes a first ply and a second ply that is layered outward of the first ply. The first ply is turned up around the beads from an inner side toward an outer side in an axial direction. By the turning-up, the first ply includes a main portion and turned-up portions. The second ply is turned back around the beads from the outer side toward the inner side in the axial direction. By the turning-back, the second ply includes a main portion and turned-back portions.

A pneumatic tire mountable on a 15° tapered specified rim, the pneumatic tire including a bead portion, bead core, a carcass, a steel cord reinforcing layer, and a bead rubber layer. A distance from a second line segment to a third line segment is from 4 mm to 8 mm, and a ratio R2/R1 is from 0.935 to 0.975, wherein R2 is a tire radius at a bead toe of a bead base portion and R1 is a tire radius at a bead heel.