Abstract: A pneumatic tire includes a main groove in a tread portion. The main groove has a groove depth of from 7 mm to 11 mm. A rubber composition for a tread constituting the tread portion includes a natural rubber, a styrene-butadiene rubber, and a butadiene rubber as a rubber component. The average glass transition temperature of the rubber component is ?50° C. or lower. Silica is compounded in the rubber composition for a tread at 50 parts by mass to 100 parts by mass per 100 parts by mass of the rubber component. The compounded amount of the silica is 80 mass % or more of the total amount of carbon black and silica. Aroma oil is compounded in the rubber composition for a tread at 40 mass % or less relative to the amount of silica.

Abstract: The present technology provides a rubber composition containing: (A) a diene rubber, (B) from 5 to 200 parts by mass of silica per 100 parts by mass of the diene rubber, (C) from 1 to 20 mass % of a sulfur-containing silane coupling agent relative to the amount of the silica, (D) for example, from 1 to 20 mass % of n-octyltriethoxysilane relative to the amount of the silica; and (E) from 1 to 20 mass % of a glycerol monofatty acid ester derived from a fatty acid having from 8 to 24 carbons relative to the mass of the silica (B).

Abstract: The present technology provides a rubber composition including: (A) 100 parts by mass of a diene rubber; (B) from 5 to 200 parts by mass of silica; (C) from 1 to 20 mass % of a silane coupling agent relative to the silica; and (D) from 1 to 20 mass % of a glycerin mono-fatty acid ester relative to a mass of the silica (B), the glycerin mono-fatty acid ester being derived from a fatty acid having from 8 to 24 carbons; not less than 10 parts by mass out of 100 parts by mass of the diene rubber (A) having a hetero atom-containing functional group in a main chain and/or a terminal thereof.

Abstract: The present technology provides a rubber composition including: (A) 100 parts by mass of a diene rubber; (B) from 5 to 200 parts by mass of silica; (C) from 1 to 20 mass % of a silane coupling agent relative to the silica; and (D) from 1 to 20 mass % of a glycerin mono-fatty acid ester relative to a mass of the silica (B), the glycerin mono-fatty acid ester being derived from a fatty acid having from 8 to 24 carbons; not less than 10 parts by mass out of 100 parts by mass of the diene rubber (A) having a hetero atom-containing functional group in a main chain and/or a terminal thereof.

Abstract: The present technology provides a rubber composition containing: (A) a diene rubber, (B) from 5 to 200 parts by mass of silica per 100 parts by mass of the diene rubber, (C) from 1 to 20 mass % of a sulfur-containing silane coupling agent relative to the amount of the silica, (D) for example, from 1 to 20 mass % of n-octyltriethoxysilane relative to the amount of the silica; and (E) from 1 to 20 mass % of a glycerol monofatty acid ester derived from a fatty acid having from 8 to 24 carbons relative to the mass of the silica (B).

Abstract: The present technology provides a rubber composition comprising from 30 to 100 parts by weight of a carbon black, and from 10 to 80 parts by weight of an inorganic filler per 100 parts by weight of a diene rubber, wherein the inorganic filler has from 20 to 80% particles of a particle size of at most 5 ?m; and when an aluminum content in the inorganic filler is defined as Wal wt. % and a silicon content is defined as Wsi wt. %, the aluminum content Wal is from 11 to 40 wt. %, and a ratio Wal/(Wal+Wsi)×100 of aluminum to a total of aluminum and silicon is from 15 to 38 wt. %.

Abstract: The present technology provides a rubber composition comprising from 30 to 100 parts by weight of a carbon black, and from 10 to 80 parts by weight of an inorganic filler per 100 parts by weight of a diene rubber, wherein the inorganic filler has from 20 to 80% particles of a particle size of at most 5 ?m; and when an aluminum content in the inorganic filler is defined as Wal wt. % and a silicon content is defined as Wsi wt. %, the aluminum content Wal is from 11 to 40 wt. %, and a ratio Wal/(Wal+Wsi)×100 of aluminum to a total of aluminum and silicon is from 15 to 38 wt. %.