RUBBER COMPOSITION AND PNEUMATIC TIRE

A rubber composition is disclosed comprising: 100 parts by weight of elastomer consisting of 25 to 35 phr of a styrene-butadiene rubber, 25 to 35 phr of a polybutadiene, and 35 to 45 phr of a natural rubber or synthetic polyisoprene, wherein the styrene-butadiene rubber is a functionalized solution polymerized styrene-butadiene elastomer having a glass transition temperature Tg(A) ranging from -30 to -10 °C and having at least one functional group, wherein the natural rubber or synthetic polyisoprene has a Tg(B) ranging from -60 to -70 °C, wherein the polybutadiene is a cis 1,4 polybutadiene having a Tg(C) ranging from -110 to -90 °C, and wherein Tg(A) - Tg(B) ≥ 25 °C, and Tg(B) - Tg(C) ≥ 25 °C. The rubber composition further comprises 60 to 80 phr of a silica, preferably a prehydrophobated silica; 1 to 10 phr of a carbon black; 1 to 3 phr of a rubber processing oil; and 5 to 25 phr of at least one hydrocarbon resin having a Tg ≥ 20 °C. The weight ratio of hydrocarbon resin to rubber processing oil is greater than 8. The rubber composition may be used in a tread of a pneumatic tire.