US Patent 7915335 Rubber composition and pneumatic tire

A rubber composition is provided that attains both low heat generating property and high reinforcement property simultaneously at high levels, is capable of attaining low fuel consumption through the tire, is excellent in durability, and is good in workability and surface property. The rubber composition contains 100 parts by weight of a diene rubber component, from 0.5 to 50 parts by weight of bagasse charcoal having a BET specific surface area of from 10 to 300 m2/g, and at least one of carbon black and silica. The total amount of the bagasse charcoal, the carbon black and the silica is preferably from 30 to 100 parts by weight per 100 parts by weight of the diene rubber component.