Patent ID: 8846791

Claim:
A tire rubber composition, comprising: a rubber component that contains an epoxidized natural rubber; silica; and a silane coupling agent, wherein the amount of the epoxidized natural rubber in 100% by mass of the rubber component is 40% by mass or more, the silica has a CTAB specific surface area of 195 m 2 /g to 600 m 2 /g and a BET specific surface area of 200 m 2 /g to 600 m 2 /g, and the silane coupling agent contains a mercapto group; wherein the amount of the silica is 30 to 75 parts by mass per 100 parts by mass of the rubber component, and the amount of the silane coupling agent containing the mercapto group is 0.5 to 20 parts by mass per 100 parts by mass of the silica.