Pneumatic tire

A pneumatic tire comprising a pair of bead portions, a pair of sidewall portions, a tread portion continuing to both the sidewall portions, a carcass toroidally extending between the pair of bead portions to reinforce these portions and comprised of one or more carcass plies, and a pair of side reinforcing rubber layers each having a crescent shape in section and disposed at an inside of the carcass in the sidewall portion,

• wherein the carcass ply is formed by covering plural reinforcing cords arranged in parallel with a coating rubber, and the reinforcing cord is a cord formed by twisting a filament bundle(s) including not less than 50% by mass of a polyketone fiber and satisfies conditions of the above equations (I) and (II)
• and as the coating rubber is used a rubber composition having a dynamic elastic modulus (E′) at 25° C. and 1% strain of not less than 8.0 MPa.

A pneumatic tire comprising a pair of bead portions, a pair of sidewall portions, a tread portion continuing to both the sidewall portions, a carcass toroidally extending between the pair of bead portions to reinforce these portions and comprised of one or more carcass plies, and a pair of side reinforcing rubber layers each having a crescent shape in section and disposed at an inside of the carcass in the sidewall portion,

• wherein the carcass ply is formed by covering plural reinforcing cords arranged in parallel with a coating rubber, and the reinforcing cord is a cord formed by twisting a filament bundle(s) including not less than 50% by mass of a polyketone fiber and satisfies conditions of the above equations (I) and (II)
• and as the coating rubber is used a rubber composition having a loss tangent (tan δ) at 25° C. and 1% strain of less than 0.12 and a dynamic elastic modulus (E′) at 25° C. and 1% strain of not less than 8.0 MPa.

A pneumatic tire comprising a pair of bead portions, a pair of sidewall portions, a tread portion continuing to both the sidewall portions, a carcass toroidally extending between the pair of bead portions to reinforce these portions and comprised of one or more carcass plies, and a pair of side reinforcing rubber layers each having a crescent shape in section and disposed at an inside of the carcass in the sidewall portion,

• wherein the carcass ply is formed by covering plural reinforcing cords arranged in parallel with a coating rubber, and the reinforcing cord is a cord formed by twisting a filament bundle(s) including not less than 50% by mass of a polyketone fiber and satisfies conditions of the above equations (I) and (II):
• and to the side reinforcing rubber layer is used a rubber composition in which an elastic modulus at 25° C. and 100% elongation during the vulcanization is 5 to 20 MPa, and a dynamic elastic modulus (E′) at 25° C. is not more than 10.5 MPa, and a minimum value of a dynamic elastic modulus (E′) between 200° C. and 250° C. is not less than 75% of a dynamic elastic modulus (E′) at 50° C., and a viscosity (G′) at 130° C. during the unvulcanization is not less than 50 MPa.