Patent ID: 7737204

Claim:
A tire having a component of a rubber composition which comprises, based upon parts by weight per 100 parts by weight rubber (phr): (A) at least one conjugated diene-based elastomer; (B) from about 20 to about 120 phr of at least one rubber reinforcing filler comprised of a combination of: (1) about 30 to about 95 phr of precipitated silica which contains hydroxyl groups, and (2) from 5 to about 50 phr of rubber reinforcing carbon black; (C) coupling agent for said silica having a moiety reactive with hydroxyl groups on said precipitated silica and another different moiety interactive with said conjugated diene-based elastomer(s); and (D) from about 2 to about 120 phr of rubber processing oil comprised of: (1) from about 3 to about 95 phr of at least one liquid partially decarboxylated rosin acid, wherein said partially decarboxylated rosin acid is a rosin oil having an acid number in a range of from about 4 to about 5, and (2) from about 2 to about 30 phr of petroleum based rubber processing oil; wherein said rosin acid for said partially decarboxylated rosin oil is comprised of at least one of non-petroleum, plant derived: (A) gum rosin acid from pine tree oleoresin extrudate, (B) wood rosin acid oleoresin from aged pine tree stumps, and (C) tall oil rosin acid; wherein said elastomers are comprised of at least one of cis 1,4-polyisoprene, cis 1,4-polybutadiene, styrene/butadiene copolymers, styrene/isoprene copolymers and styrene/isoprene/butadiene terpolymers.