There is provided a racing tire improving grip performance, processability and rubber strength at a high temperature in highly good balance and a rubber composition capable of producing a tread having thereof. A rubber composition comprising 70 to 150 parts by weight of carbon black with a nitrogen adsorption specific area of 100 to 300 m.sup.2/g based on 100 parts by weight of a rubber component comprising a solution polymerization styrene-butadiene rubber satisfying the formula below: (Vinyl content).gtoreq.100-2.times.(styrene content), 30 to 170 parts by weight of a softener and 1 to 30 parts by weight of a compound satisfying the general formula (1): --(R--S.sub.x).sub.n-- (1) (wherein R is --(CH.sub.2--CH.sub.2--O).sub.m--CH.sub.2--CH.sub.2-- , x is an integer of 3 to 6, n is an integer of 10 to 400 and m represents an integer of 2 to 5.).