Patent ID: 8312905

Claim:
A pneumatic tire having a tread comprising a vulcanizable rubber composition comprising, expressed as parts by weight per 100 parts by weight of elastomer (phr), 100 phr of elastomer consisting of elastomers (A), (B) and (C): (A) 30 to 70 phr of a first styrene-butadiene rubber, wherein the first styrene-butadiene rubber is i) a solution-polymerized styrene-butadiene rubber with a bound styrene content of from 30 to 50 percent by weight, a vinyl 1,2 content of from 10 to 40 percent by weight based on the rubber weight, and a Tg of from about −40° C. to about −20° C.; or ii) an emulsion-polymerized styrene-butadiene rubber with a bound styrene content of from 30 to 50 percent by weight, and a Tg of from about −40° C. to about −20° C.; (B) 20 to 60 phr of a second styrene-butadiene rubber, wherein the second styrene-butadiene rubber is a solution-polymerized styrene-butadiene rubber with a bound styrene content of from 25 to 45 percent by weight, a vinyl 1,2 content of from 20 to 60 percent by weight based on the rubber weight, and a Tg of from about −30° C. to about −5° C.; (C) 5 to 20 phr of cis-1,4 polybutadiene having a Tg of from −110° C. to −90° C.; (D) 30 to 60 phr of a low PCA process oil having a polycyclic aromatic content of less than 3 percent by weight as determined by the IP346 method; (E) 5 to 20 phr of carbon black having an Iodine absorption ranging from 130 to 210 g/kg according to ASTM D-1510 and an oil absorption ranging from 110 to 140 cc/100 g according to ASTM D-2414; (F) 80 to 130 phr of silica having a CTAB specific surface area (S CTAB ) of between 40 and 525 m 2 /g, a BET specific surface area (S BET ) of between 45 and 550 m 2 /g; (G) 0.5 to 20 phr of sulfur containing organosilicon compound; and (H) 5 to 20 phr of resin comprising alphamethyl styrene resin and coumarone-indene resin.