Sulfur crosslinkable rubber composition

Sulfur-crosslinkable rubber mixture comprises 45-85 phr natural- and/or synthetic polyisoprene, 15-55 phr at least one styrene-butadiene rubber, 25-55 phr carbon black, 4-40 phr silicic acid and 2-20 phr at least one hydrocarbon resin made of alpha -methylstyrene, styrene and/or vinyl toluene.