| 摘要 |
Disclosed is a pneumatic tire which can improve its riding comfort under normal driving conditions, and which can improve its durability under run-flat driving conditions, while its increase in weight is inhibited as much as possible. This pneumatic tire includes a carcass layer and a belt layer. The carcass layer is formed of two or more carcass plies, each of which is constituted of organic fiber cords. The belt layer is formed of at least two belt plies, each of which is arranged outwards from the carcass layer in a radial direction of the tire in a tread part. The tread part includes a tread reinforcement rubber layer outward from a carcass ply which is located in the outermost position in the radial direction of the tire out of the carcass plies, and inwards from a belt play which is located in the innermost position in the radial direction of the tire out of the belt plies. Each of the side wall parts includes a side reinforcement rubber layer, which has a crescent-shaped cross section, inwards from a carcass ply which is located in the innermost position in an axis direction of the tire out of the carcass plies. At least one of the carcass plies constituting the carcass layer has a structure which makes the carcass ply folded back about bead cores respectively of bead parts. |
