The Yokohama Rubber Co., Ltd.

Fumito Ishii

Kenichiro Sugitani

Kunihiko Kakigi

A pneumatic tire of the type wherein a plurality main grooves extending in a tire circumferential direction are so disposed on a tread surface as to define a plurality of rib lines and a plurality of lug grooves are so disposed in said rib lines as to define a plurality of blocks, characterized in that lug groove angles in each of the rib lines to the tire circumferential direction are changed within a range of a maximum-to-minimum ratio of 1.1 to 1.4 as a repeating unit of a geometric progression, and the lug groove angles in the rib lines positioned on the shoulder side to the tire circumferential direction are set to be greater than the lug groove angles in the rib lines positioned on the center side to the tire circumferential direction.

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Hiratsuka, Japan

Fumito Ishii