US Patent 11180640 Rubber composition for tread and tire

A rubber composition for a tread comprising: 10 to 30 parts by mass of carbon black A having an iodine adsorption amount of 130 mg/g or more and 20 to 50 parts by mass of carbon black B having an iodine adsorption amount of 110 mg/g or more and less than 130 mg/g based on 100 parts by mass of a rubber component comprising 25 to 45% by mass of a styrene-butadiene rubber having a styrene content of 15% by mass or less and a vinyl content of from 30 to 50 mol %, 45 to 65% by mass of an isoprene-based rubber and 5 to 15% by mass of a butadiene rubber, wherein assuming that a content of the carbon black A is X part by mass, a content of the carbon black B is 0.6X to 4.5X part by mass.