RUBBER COMPOSITION AND TIRE

Provided are a rubber composition and a tire which provide improved overall performance including excellent abrasion resistance and fuel economy during high speed running. Included is a rubber composition which contains: rubber components including an isoprene-based rubber and a polybutadiene rubber; silica; and a modified rubber material functionalized with a thiuram sulfide compound, has a silica content of 30 to 150 parts by mass per 100 parts by mass of the rubber components, and satisfies the following relationship (1) with respect to the isoprene-based rubber content and the polybutadiene rubber content: (1) Isoprene-based rubber content > Polybutadiene rubber content.