Abstract: Provided is a rubber composition fora tire. Thirty parts by mass or more of carbon black having a CTAB adsorption specific surface area of 100 m2/g or less is blended into 100 parts by mass of a conjugated diene-based copolymer that includes from 20 mass % to 60 mass % of a first conjugated diene-based copolymer containing an isoprene component and from 40 mass % to 80 mass % of a second conjugated diene-based copolymer containing syndiotactic-1,2-polybutadiene. The syndiotactic-1,2-polybutadiene has a content of a crystallized component of 90% or more, a melting point of 130° C. or lower, and a glass transition temperature Tg of ?20° C. or higher. A content a crystallized component in the second conjugated diene-based copolymer is 30 mass % or less.

Abstract: A heavy duty pneumatic tire comprises an innerliner including a laminated first liner and second liner; a thickness of the first liner being 1.2 to 1.9 mm; a thickness of the second liner being 1.2 to 1.6 mm; a total thickness of the first and second liners being 2.4 to 3.4 mm; the first and second liners being made of rubber compositions 1 and 2; rubber composition 1 containing 5 to 50 parts by weight of a plate-like inorganic filler having a particle size of 4.9 to 7.5 ?m and an aspect ratio of 3.0 to 7.0 per 100 parts by weight of a diene rubber containing 50 to 100 wt. % of butyl rubber; and rubber composition 2 containing 0.05 to 0.5 parts by weight of an organic metal salt as metal content per 100 parts by weight of a diene rubber containing at least 50 wt. % of natural rubber.

Abstract: A heavy duty pneumatic tire comprises an innerliner including a laminated first liner and second liner; a thickness of the first liner being 1.2 to 1.9 mm; a thickness of the second liner being 1.2 to 1.6 mm; a total thickness of the first and second liners being 2.4 to 3.4 mm; the first and second liners being made of rubber compositions 1 and 2; rubber composition 1 containing 5 to 50 parts by weight of a plate-like inorganic filler having a particle size of 4.9 to 7.5 ?m and an aspect ratio of 3.0 to 7.0 per 100 parts by weight of a diene rubber containing 50 to 100 wt. % of butyl rubber; and rubber composition 2 containing 0.05 to 0.5 parts by weight of an organic metal salt as metal content per 100 parts by weight of a diene rubber containing at least 50 wt. % of natural rubber.