| abstract |
There is provided a rubber composition for a steel cord gum, a breaker edge strip, a breaker pad or a strip adjacent to cords, which can improve the stability in drivability, fuel economy, elongation at break, adhesion to steel cords, processability and tire life in a balanced manner, even if the ratio of Zinc oxide content to sulfur content is a specific value or less, and there is provided a pneumatic tire using them. The rubber composition contains a specific insoluble sulfur, has a predetermined ratio of zinc oxide content to sulfur content and has a predetermined sulfur content, a predetermined cobalt content, a predetermined sum of (A) stearic acid and (B) stearic acid calculated cobalt stearate and the amount of (C) a mixture of a zinc salt of an aliphatic carboxylic acid and a zinc salt of an aromatic carboxylic acid. |