The present invention relates to a sulfur cured rubber composition particularly suited for use in tire treads and carcass ply compounds. The sulfur cured rubber composition is composed of, based on 100 parts by weight of rubber, from about 5 to 95 parts by weight of epoxidized rubber; from about 5 to 85 parts of a silica filler; from about 0.5 to 8.5 parts by weight of a silica coupling agent; and 95 to 5 parts by weight of a rubber selected from the group consisting of medium vinyl polybutadiene, styrene-butadiene rubber, synthetic cis-1,4-polyisoprene, synthetic 3,4-polyisoprene, natural rubber, cis-polybutadiene, styrene-isoprene rubber, styrene-isoprene-butadiene rubber, acrylonitrile-butadiene rubber and mixtures thereof.
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