Rubber composition for tire and tire containing same

A rubber composition for a tire, obtained by blending a reinforcing filler comprising silica and carbon black, from not less than 0.5 to less than 5.0 parts by mass of an alkylsilane having an alkyl group with from 7 to 20 carbons in 100 parts by mass of a diene rubber including from 20 to 45% by mass of a natural rubber, from 20 to 45% by mass of a styrene-butadiene rubber, and from 20 to 45% by mass of a butadiene rubber that add up to a total of 100% by mass and a sulfur-containing silane coupling agent in an amount of from 4% to 16% by mass of the silica, a rubber hardness of the rubber composition at 23° C. being 68 or more, and the natural rubber being an unmodified natural rubber;

• wherein
• a total oil content in the rubber composition is less than a content of the natural rubber,
• a blended amount (Ms) of the silica is from 82 to 95 parts by mass with respect to the 100 parts by mass of the diene rubber, and
• a ratio by mass (Ms/Mc) of the blended amount (Ms) of the silica to a blended amount (Mc) of the carbon black is from 7.5 to 19, and
• a total (Ms+Mc) of the blended amount (Ms) of the silica and the blended amount (Mc) of the carbon black is from 86 to 100 parts by mass with respect to the 100 parts by mass of the diene rubber.