Abstract: Provided is a heavy duty pneumatic tire having excellent abrasion resistance. The heavy duty pneumatic tire includes a tread portion including a rubber composition containing: an isoprene rubber; a butadiene rubber; a styrene-butadiene rubber; and a carbon black having an average particle size of 20 nm or less and/or a cetyltrimethylammonium bromide adsorption specific surface area of 130 m2/g or more, the tread portion having a land ratio of 81% or higher.

Abstract: 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.

Abstract: 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.

Abstract: An object of the present invention is to provide a rubber composition for a tire having improved overall performances such as block crack resistance, abrasion resistance and heat build-up characteristic, and a tire having a tire member composed of this rubber composition. The rubber composition for a tire comprises a rubber component comprising 50% by mass or more of an isoprene rubber, 30% by mass or more of a butadiene rubber and 1 to 20% by mass of a styrene-butadiene rubber having a number-average molecular weight of 150,000 or more and a styrene content of 18 to 38% by mass, wherein a value obtained by multiplying a content (% by mass) of the styrene-butadiene rubber by a styrene content (% by mass) of the styrene-butadiene rubber is from 100 to 400.

Abstract: Provided is a heavy duty pneumatic tire having excellent abrasion resistance. The heavy duty pneumatic tire includes a tread portion including a rubber composition containing: an isoprene rubber; a butadiene rubber; a styrene-butadiene rubber; and a carbon black having an average particle size of 20 nm or less and/or a cetyltrimethylammonium bromide adsorption specific surface area of 130 m2/g or more, the tread portion having a land ratio of 81% or higher.

Abstract: Provided is a rubber composition for a tread, comprising 20 to 40 parts by mass of carbon black having an iodine adsorption amount of 130 mg/g or more, based on 100 parts by mass of a rubber component, the rubber component comprising: 15 to 30% by mass of a styrene-butadiene rubber having a styrene content of 15% by mass or less and a vinyl content of 30 to 45% by mole; 40 to 60% by mass of an isoprene-based rubber; and 20 to 40% by mass of a butadiene rubber, wherein, when a content of the styrene-butadiene rubber is defined as X parts by mass, a content of the carbon black is 0.8x to 2.5x parts by mass, the rubber composition further comprising 0.5x parts by mass or less of a softening agent.

Abstract: An object of the present invention is to provide a rubber composition for a tire having improved overall performances such as block crack resistance, abrasion resistance and heat build-up characteristic, and a tire having a tire member composed of this rubber composition. The rubber composition for a tire comprises a rubber component comprising 50% by mass or more of an isoprene rubber, 30% by mass or more of a butadiene rubber and 1 to 20% by mass of a styrene-butadiene rubber having a number-average molecular weight of 150,000 or more and a styrene content of 18 to 38% by mass, wherein a value obtained by multiplying a content (% by mass) of the styrene-butadiene rubber by a styrene content (% by mass) of the styrene-butadiene rubber is from 100 to 400.