RUBBER COMPOSITION AND TIRE

摘要

The purpose of the present invention is to provide a rubber composition that has excellent low heat generation and excellent wear resistance. The present invention is a rubber composition that is for a tire tread and that contains: a rubber component that includes at least a modified diene rubber wherein 0.02-4 mol% of the total double bonds of a source-material diene rubber have been carboxy-group modified; a silica 1 that has a nitrogen-adsorption specific surface area of 155 m2/g or higher; a silica 2 that has a nitrogen-adsorption specific surface area of 125 m2/g or lower; and a silane coupling agent. The modified diene rubber content is 10-100 parts by mass per 100 parts by mass of the rubber component, the total content of the silica 1 and the silica 2 is 55-200 parts by mass per 100 parts by mass of the rubber component, and the silane coupling agent content is 2-16 mass% of said total content. The present invention is also a tire that has a tire tread that uses the rubber composition.