Abstract: A pneumatic tire includes a shoulder land portion and a narrow groove in a tread surface. The narrow groove extends in the tire circumferential direction and sections the shoulder land portion into a main land portion and a sub land portion. A first groove portion extends in parallel to the tire equator surface from the tread surface toward an inner side in a tire radial direction. A second groove portion is provided closer to the inner side in the tire radial direction and the tire equator surface side than the first groove portion, and extends in parallel to the tire equator surface. A connection portion is connected to the first groove portion and the second groove portion. A groove bottom portion is provided in an end portion of the second groove portion and has a widened groove width by depressing a groove wall of the second groove portion.

Abstract: A pneumatic tire that includes a pair of bead cores, a pair of bead fillers connected to the bead cores respectively, a ply which extends between the bead cores; steel chafers disposed outside the ply, and inner nylon chafers disposed outside the steel chafers. The inner nylon chafers extend upward from positions in the vicinity of heels of the bead cores. The pneumatic tire also includes outer nylon chafers are disposed outside the inner nylon chafer.

Abstract: A pneumatic tire for heavy loads comprising a bead core, a bead filler arranged on the outside in a tire radial direction of the lead core, a steel cord-containing carcass ply wound up on the outside from the inside in a fire axis direction around the bead core, a steel cord-containing chafer provided so as to cover the carcass ply from the inside in the tire radial direction, and a reinforcing sheet comprising a rubber and a cotton kneaded therein and interposed between the bead core and the carcass ply. The tire can improve durability of a bead part.

Abstract: A pneumatic tire includes a carcass ply wound up from an inner side to an outer side around bead cores, chafers wound up from an outer side to an inner side around the bead cores, and an inner liner rubber which is arranged in an inner side of the carcass ply, wherein a squeegee rubber having a higher modulus than the inner liner rubber is provided closer to the inner liner rubber side than the chafers between the carcass ply and the inner liner rubber, and the squeegee rubber is arranged so as to cover inside wound-up ends of the chafers, and is provided with a thick portion which is thicker than the inner liner rubber, and thin portions which are arranged respectively in an inner side and an outer side in the tire diametrical direction of the thick portion and are thinner than the inner liner rubber.

Abstract: A pneumatic tire includes a shoulder land portion and a narrow groove in a tread surface. The narrow groove extends in the tire circumferential direction and sections the shoulder land portion into a main land portion and a sub land portion. A first groove portion extends in parallel to the tire equator surface from the tread surface toward an inner side in a tire radial direction. A second groove portion is provided closer to the inner side in the tire radial direction and the tire equator surface side than the first groove portion, and extends in parallel to the tire equator surface. A connection portion is connected to the first groove portion and the second groove portion. A groove bottom portion is provided in an end portion of the second groove portion and has a widened groove width by depressing a groove wall of the second groove portion.

Abstract: A pneumatic tire that includes a pair of bead cores, a pair of bead fillers connected to the bead cores respectively, a ply which extends between the bead cores; steel chafers disposed outside the ply, and inner nylon chafers disposed outside the steel chafers. The inner nylon chafers extend upward from positions in the vicinity of heels of the bead cores. The pneumatic tire also includes outer nylon chafers are disposed outside the inner nylon chafer.

Abstract: A pneumatic tire includes a carcass ply wound up from an inner side to an outer side around bead cores, chafers wound up from an outer side to an inner side around the bead cores, and an inner liner rubber which is arranged in an inner side of the carcass ply, wherein a squeegee rubber having a higher modulus than the inner liner rubber is provided closer to the inner liner rubber side than the chafers between the carcass ply and the inner liner rubber, and the squeegee rubber is arranged so as to cover inside wound-up ends of the chafers, and is provided with a thick portion which is thicker than the inner liner rubber, and thin portions which are arranged respectively in an inner side and an outer side in the tire diametrical direction of the thick portion and are thinner than the inner liner rubber.