| 摘要 |
A pneumatic tire with a radial ply carcass has a tread composed of (1) an outer rubber cap composition 5 including a high reinforcing carbon black, e.g. HAF, ISAF or SAF, and having a hot rebound value (as measured by ASTM 1054-66) in the range of 55 to 70 and (2) a base rubber composition 7 including a semi-reinforcing carbon black, e.g. FEF, GPF or SRF, and having a hot rebound value in the range of 75 to 90. The cap composition 5 may include butadiene/styrene rubber together with polybutadiene and/or cis-1,4-polyisoprene, and the base composition 7 may comprise butadiene/styrene rubber, natural rubber and polybutadiene, specific formulations for the compositions being given in the specification. <IMAGE> |
