A winter tire, comprising a tread formed from a rubber composition, the rubber composition comprising: an oil-extended polybutadiene rubber having a cis content of 95 mol% or more, a vinyl content of 1 mol% or less, and a weight average molecular weight of 530,000 or more; an isoprene-based diene rubber; silica; and carbon black, the oil-extended polybutadiene rubber being synthesized using a rare earth catalyst, the rubber composition comprising, based on 100% by mass of the total rubber solids, 8% to 80% by mass of a polybutadiene rubber component contained in the oil-extended polybutadiene rubber and 13% to 80% by mass of the isoprene-based diene rubber, the rubber composition comprising, relative to 100 parts by mass of the total rubber solids, 15 to 125 parts by mass of the silica and 3 to 70 parts by mass of the carbon black, provided that a combined amount of the silica and the carbon black is 45 to 130 parts by mass, wherein said winter tire is not a winter tire comprising a tread formed from a rubber composition comprising: an oil extended polybutadiene rubber having a cis content of 95 mol% or more, a vinyl content of 1 mol% or less, and a weight average molecular weight of 530,000 or more; a styrene-butadiene rubber having a bound styrene content of 30 to 50% by mass, determined by 1H-NMR analysis, and a weight average molecular weight of 700,000 or more; an isoprene-based diene rubber; silica; and carbon black, the oil-extended polybutadiene rubber being synthesized using a rare earth catalyst, the rubber composition comprising, based on 100% by mass of rubber solids, 10 to 67% by mass of a polybutadiene rubber component contained in the oil-extended polybutadiene rubber, 10 to 50% by mass of the styrene-butadiene rubber, and 13 to 30% by mass of the isoprene-based diene rubber, the rubber composition comprising, relative to 100 parts by mass of the total rubber solids, 15 to 125 parts by mass of the silica and 3 to 70 parts by mass of the carbon black, provided that a combined amount of the silica and carbon black is 60 to 130 parts by mass. an oil-extended polybutadiene rubber having a cis content of 95 mol% or more, a vinyl content of 1 mol% or less, and a weight average molecular weight of 530,000 or more; an isoprene-based diene rubber; silica; and carbon black, the oil-extended polybutadiene rubber being synthesized using a rare earth catalyst, the rubber composition comprising, based on 100% by mass of the total rubber solids, 8% to 80% by mass of a polybutadiene rubber component contained in the oil-extended polybutadiene rubber and 13% to 80% by mass of the isoprene-based diene rubber, the rubber composition comprising, relative to 100 parts by mass of the total rubber solids, 15 to 125 parts by mass of the silica and 3 to 70 parts by mass of the carbon black, provided that a combined amount of the silica and the carbon black is 45 to 130 parts by mass, wherein said winter tire is not a winter tire comprising a tread formed from a rubber composition comprising: an oil extended polybutadiene rubber having a cis content of 95 mol% or more, a vinyl content of 1 mol% or less, and a weight average molecular weight of 530,000 or more; a styrene-butadiene rubber having a bound styrene content of 30 to 50% by mass, determined by 1H-NMR analysis, and a weight average molecular weight of 700,000 or more; an isoprene-based diene rubber; silica; and carbon black, the oil-extended polybutadiene rubber being synthesized using a rare earth catalyst, the rubber composition comprising, based on 100% by mass of rubber solids, 10 to 67% by mass of a polybutadiene rubber component contained in the oil-extended polybutadiene rubber, 10 to 50% by mass of the styrene-butadiene rubber, and 13 to 30% by mass of the isoprene-based diene rubber, the rubber composition comprising, relative to 100 parts by mass of the total rubber solids, 15 to 125 parts by mass of the silica and 3 to 70 parts by mass of the carbon black, provided that a combined amount of the silica and carbon black is 60 to 130 parts by mass. an oil extended polybutadiene rubber having a cis content of 95 mol% or more, a vinyl content of 1 mol% or less, and a weight average molecular weight of 530,000 or more; a styrene-butadiene rubber having a bound styrene content of 30 to 50% by mass, determined by 1H-NMR analysis, and a weight average molecular weight of 700,000 or more; an isoprene-based diene rubber; silica; and carbon black, the oil-extended polybutadiene rubber being synthesized using a rare earth catalyst, the rubber composition comprising, based on 100% by mass of rubber solids, 10 to 67% by mass of a polybutadiene rubber component contained in the oil-extended polybutadiene rubber, 10 to 50% by mass of the styrene-butadiene rubber, and 13 to 30% by mass of the isoprene-based diene rubber, the rubber composition comprising, relative to 100 parts by mass of the total rubber solids, 15 to 125 parts by mass of the silica and 3 to 70 parts by mass of the carbon black, provided that a combined amount of the silica and carbon black is 60 to 130 parts by mass.