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.

A pneumatic tire comprises a tread; a bead region, a sidewall; a bead core; a first apex; an apex-extension; a carcass; a chafer and a second apex. The second apex is positioned between a rim flange protector and the first apex or the extension. The carcass includes a first ply turned-up around the bead core to form a first turnup portion extending along the first apex and the extension and terminating radially inwardly from the radially outward end of the extension. The carcass may include a second ply turned-up, between the bead core and the first ply, around the bead core to form a second turnup portion, the second turnup portion extending along the axially outer side of the first apex. Alternatively, the carcass may include a second ply parting from the first ply at the extension and extending along the extension and the turnup portion of the first ply.

A tire 2 of the present invention includes a pair of fillers 20 turned up around beads 10. Each filler 20 has multiple cords made of steel and aligned with each other. In the tire 2, an outer surface of a chafer 8 has a bottom surface 26 that contacts with a seat surface of a rim 30. When a reference line M represents a straight line that contacts with the bottom surface 26 in a cross-section obtained by cutting the tire at the plane perpendicular to the circumferential direction, the bottom surface 26 has a depression 66 that is shaped so as to project radially outward of the reference line M. A ratio (D/L) of a maximum depth D of the depression 66 to a width L of the depression 66 is greater than or equal to 0.007 and not greater than 0.060.

A heavy-duty pneumatic tire includes a carcass ply including a main portion extending between bead cores and a pair of turn-up portions, a first reinforcing layer of a steel cord disposed in each bead portion in a U-shaped manner, and a second reinforcing layer of an organic fiber cord disposed in each bead portion and at least a part of the second reinforcing layer extending in a radial direction of the tire at an axially outward location of the first reinforcing layer. The second reinforcing layer includes an axially inner second ply and an outer second ply. The outer second ply has an inner end positioned below the bead core. The inner second ply has an inner end located axially inward of the inner end of the outer second ply, and has a substantially same length as the outer second ply in a tire cross-section.

In a pneumatic tire, a bead core has end portions in a tire width direction formed as vertical lines along a tire radial direction. A length of the vertical lines is from 20% to 30% of a core height. In two adjacent bead core layers of first, second and third layers, the radial outer layer tire includes two or more bead cores more than the radially inner layer tire, and a misalignment amount between the bead wires each at an end portion on one side in the tire width direction is one-half of a bead wire thickness. A side on which the misalignment amount between the first and second layer bead wires is one-half of the thickness of the bead wire is opposite in the tire width direction to a side on which the misalignment amount between the second and third layer bead wires is one-half of the thickness of the bead wire.

In a pneumatic tire, a turned back portion of a carcass layer contacts a body portion of the carcass layer in a cross-sectional view in a tire meridian direction to form a closed region surrounding bead cores. A rubber occupancy ratio in the closed region is in a range of 15% or less. The bead cores have a predetermined wire arrangement structure formed by arranging wire cross sections of bead wires in the cross-sectional view in the tire meridian direction. Additionally, a self-contact height (CH) of the carcass layer and a circumferential length (L) of the wire arrangement have a relationship 1.0CH/L10.0.

In a pneumatic tire, a rubber occupancy ratio in a closed region is in a range of 15% or less. Bead cores have a predetermined wire arrangement structure formed by arranging wire cross sections of bead wires in a cross-sectional view in a tire meridian direction. A tangential contacts an innermost layer in a tire radial direction and the wire cross sections innermost and outermost in a tire lateral direction in the wire arrangement structure from a rim fitting surface side. Contact points of the tangent line are on the innermost and outermost wire cross sections. A gauge is in the tire lateral direction from the midpoint to the rim fitting surface. A rate of change of the gauge between before and after mounting on a rim is in a range from 10% or greater to 60% or less.