This invention relates to preparation of rubber compositions comprised of EPDM and conjugated diene-based elastomer, particularly including cis 1,4-polyisoprene rubber, and particularly natural cis 1,4-polyisoprene rubber, blends and pneumatic rubber tire with an outer, visible sidewall layer of a rubber composition comprised of such rubber composition. For such preparation, a combination of at least two diverse EPDM elastomers is used together with a phase mixing process comprised of sequential phase mixing or parallel phase mixing in the sense of reinforcement filler and sulfur curatives.

 
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< Tire with a component made of a rubber composition comprised of a rubber having pendant hydroxyl groups and a nonsulfur containing silane

> Tire having component of rubber composition containing a carbonaceous filler composite of disturbed crystalline phrases and amorphous carbon phases

~ 00460