Pneumatic tire

A pneumatic tire comprising:

• a bead core formed of one or more bead wires wound in a ring-like and multiple manner;
• a carcass layer formed of one or more carcass plies, the carcass layer being turned back to wrap around the bead core and extending across the bead core;
• a rim cushion rubber disposed along a turned-back portion of the carcass layer to constitute a rim fitting face of a bead portion;
• and
• a cushion rubber layer having a lower rubber hardness than the rim cushion rubber, the cushion rubber layer being inserted between the innermost layer of the bead core and the rim cushion rubber, wherein
• the bead core has a predetermined wire array structure formed by arranging a wire cross-section of the bead wire in a cross-sectional view in a tire meridian direction,
• the following in the wire array structure are defined:
• a tangent line L1 that contacts, from a side of the rim fitting face, an innermost layer in a tire radial direction and innermost and outermost wire cross-sections in a tire lateral direction;
• contact points C1, C2 on the tangent line L1;
• a middle point Cm of the contact points C1, C2;
• and gauges G1, G2, and Gm in the tire radial direction from the contact points C1, C2 and the middle point Cm to the rim fitting face,
• change rates ΔG1, ΔG2, and ΔGm of the gauges G1, G2, and Gm before and after rim assembly each are in a range of 10% to 60%,
• the turned-back portion of the carcass layer contacts a body portion of the carcass layer to form a closed region that surrounds the bead core, in a cross-sectional view in the tire meridian direction,
• a rubber occupancy ratio in the closed region is 15% or less,
• the rubber occupancy ratio is calculated as a ratio of a cross-sectional area of a rubber material around the bead core in the closed region to an overall cross-sectional area of the closed region, in the cross-sectional view in the tire meridian direction,
• thicknesses Tc1, Tc2 of the cushion rubber layer between measurement points of the gauges G1, G2, respectively, satisfy a relationship Tc2<Tc1,
• the change rates ΔG1, ΔG2, and ΔGm satisfy a relationship ΔG2<ΔGm<ΔG1,
• the gauges G1, G2 and Gm before the rim assembly have a relationship G2<Gm<G1, and
• a distance Dt in the tire radial direction and a distance Wt in the tire lateral direction from the contact point C1 to a bead toe, and the gauge G1 in the tire radial direction from the contact point C1 to the rim fitting face satisfy a relationship 7°≤arctan {(Dt−G1)/Wt}≤30°.

A pneumatic tire comprising:

• a bead core formed of one or more bead wires wound in a ring-like and multiple manner;
• a carcass layer formed of one or more carcass plies, the carcass layer being turned back to wrap around the bead core and extending across the bead core;
• and
• a rim cushion rubber disposed along a turned-back portion of the carcass layer to constitute a rim fitting face of a bead portion;
• wherein
• the bead core has a predetermined wire array structure formed by arranging a wire cross-section of the bead wire in a cross-sectional view in a tire meridian direction,
• the following in the wire array structure are defined:
• a tangent line L1 that contacts, from a side of the rim fitting face, an innermost layer in a tire radial direction and innermost and outermost wire cross-sections in a tire lateral direction;
• contact points C1, C2 on the tangent line L1;
• a middle point Cm of the contact points C1, C2;
• and gauges G1, G2, and Gm in the tire radial direction from the contact points C1, C2 and the middle point Cm to the rim fitting face,
• change rates ΔG1, ΔG2, and ΔGm of the gauges G1, G2, and Gm before and after rim assembly each are in a range of 10% to 60%,
• the turned-back portion of the carcass layer contacts a body portion of the carcass layer to form a closed region that surrounds the bead core, in a cross-sectional view in the tire meridian direction,
• a rubber occupancy ratio in the closed region is 15% or less,
• the rubber occupancy ratio is calculated as a ratio of a cross-sectional area of a rubber material around the bead core in the closed region to an overall cross-sectional area of the closed region, in the cross-sectional view in the tire meridian direction,
• the change rates ΔG1 and ΔG2 satisfy a relationship ΔG2<ΔG1,
• the gauges G1 and G2 before the rim assembly have a relationship G2<G1,
• in a cross-sectional view in the tire meridian direction, a bead base of the rim fitting face has a shape formed by connecting two types of linear portions with different inclination angles to each other, an extension line L2 of one of the linear portions on a side of a bead heel of the bead base and an extension line L3 of other of the linear portions on a side of a bead toe of the bead base are defined, inclination angles α, β of the extension lines L2 and L3 of the bead base with respect to the tangent line L1 of the bead core have a relationship 1.8≤β/α≤4.0,
• the inclination angle α of the extension line L2 of the bead base with respect to the tangent line L1 of the bead core is in a range of 3°≤α≤15°, and
• a distance Dt in the tire radial direction and a distance Wt in the tire lateral direction from the contact point C1 to a bead toe, and the gauge G1 in the tire radial direction from the contact point C1 to the rim fitting face satisfy a relationship 7°≤arctan {(Dt−G1)/Wt}≤30°.