Patent ID: 7351761

Claim:
A rubber composition comprising a rubber component and a silica having a nitrogen adsorbing-specific surface area of 20 to 500 m 2 /g and present in an amount of 15 to 150 parts by weight on the basis of 100 parts by weight of the rubber component, said rubber component comprising; not less than 15% by weight of a styrene-butadiene rubber ( 1 ) having a styrene content of not less than 33% by weight and a vinyl content of not less than 30% by weight, and not less than 10% by weight of a styrene-butadiene rubber ( 2 ) having a styrene content of not more than 15% by weight and a vinyl content of not more than 60% by weight, wherein a total content of said styrene-butadiene rubber ( 1 ) and said styrene-butadiene rubber ( 2 ) is not less than 60% by weight of said rubber component.