Patent ID: 8110627

Claim:
A rubber composition for a tire comprising (B) 5 to 80 parts by mass of silica based on 100 parts by mass of (A) including (a) 10 to 60% by mass of a butadiene rubber including 2.5 to 20% by mass of 1,2-syndiotactic polybutadiene crystals, (b) 5 to 60% by mass of a modified diene rubber whose terminal is modified at a modification rate of 30 to 80% with a compound represented by the formula (1): wherein R 1 , R 2 and R 3 are same or different and are an alkyl group, an alkoxyl group, an acetal group, a carboxyl group, a mercapto group or a derivative thereof, R 4 and R 5 are same or different and are an alkyl group or a hydrogen atom and n is an integer, and (c) 20 to 75% by mass of a diene rubber other than (a) and (b).