Patent ID: 7438103

Claim:
A pneumatic tire including: a carcass layer formed of two carcass plies, defined as an outermost carcass ply and an innermost carcass ply, each of which extends along an entirety of a tread part to bead parts respectively via side wall parts and each of which are constituted of organic fiber cords; and a belt layer formed of at least two belt plies which are arranged outwards from the carcass layer in a radial direction of the tire in the tread part, wherein the tread part includes a tread reinforcement rubber layer outwards from the outermost carcass ply in the radial direction of the tire and inwards from the innermost belt ply in the radial direction of the tire, and the tread reinforcement rubber layer directly contacts with the outermost carcass ply, and further wherein both the outermost carcass ply and the innermost carcass ply extend along the full axial width of the tread reinforcement rubber layer, wherein the side wall part includes a side reinforcement rubber layer, which has a crescent-shaped cross section, inwards from the innermost carcass ply in an axial direction of the tire, the side reinforcement rubber layer directly contacts with the innermost carcass ply, wherein the carcass plies constituting the carcass layer have a structure in which the carcass plies are folded back from inside to outside of the tire about bead cores arranged respectively in the bead parts, and the folded ends of the carcass plies are disposed in a position outwards from ends of the belt plies in the axial direction of the tire, and wherein a width of the tread reinforcement rubber layer is 60 to 100% of a width of the belt ply which is located in the innermost position in the radial direction of the tire.