The Yokohama Rubber Co., Ltd.

Yoshihisa Inoue

Takayuki Suzuki

Naoya Amino

Hiroshi Iizuka

A pneumatic tire has a plurality of circumferential main grooves extending in a tire circumferential direction and a plurality of ribs partitioned by the circumferential main grooves in a tread portion. When viewing a cross-section from a tire meridian direction a contact patch of the center ribs is formed from a smooth curved line forming a convex on an outer side in a tire radial direction and a contact patch of the shoulder rib is formed from a smooth curved line forming a convex on an inner side in the tire radial direction. The curved line of the center ribs and the curved line of the shoulder rib have a point of intersection. A distance between an extended line of the curved line of the center ribs and the curved line of the shoulder rib increases from the point of intersection towards an outer side in a tire width direction.

Pneumatic tire with tread having five ribs and four circumferential grooves

A rubber composition for a tire tread including 100 parts by weight of a diene-based rubber and 5 to 150 parts by weight of carbon black having a nitrogen adsorption specific area NSA (m/g) of 80 to 150 and satisfying a relationship between a TINT (%) and dibutyl phthalate absorption DBPA (ml/100 g) of TINT (%)&#x3e;1.4 DBPA (ml/100 g) and capable of increasing the frictional force without impairing the hysteresis loss.

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Hiratsuka, Japan

Yoshihisa Inoue