Bridgestone Corporation

Kazuyoshi Tagawa

Yukihiro Kiwaki

Kenichi Shibata

Ryoichi Watabe

A plurality of shallow grooves which are shallower than a sipe are formed on land sections formed on treads of a pneumatic tire. The shallow grooves are configured so that a total sectional area of the shallow grooves per unit area in a cross section in a tire width direction in at least one of tread end areas arranged at end sides of the tread surface in the tire width direction or land end areas arranged at portions adjacent to a drain main groove on the land sections becomes larger than a total sectional area of the shallow grooves per unit on the other areas.

Pneumatic tire with tread having sipes and shallow grooves

A steel cord for the reinforcement of rubber article having M parallel&plus;N structure consists of a core of two steel filaments and a single sheath of seven or eight steel filaments, wherein diameters of core filament and sheath filament and twisting pitch have specified ranges, respectively.

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Kodaira, Japan

Kazuyoshi Tagawa