The Toyo Rubber Industry Co., Ltd.

Toyohiko Asada

Keijiro Oda

Takuya Okazaki

Masahide Nishihata

Yukitoshi Morishita

A pneumatic radial-ply tire having a tread constructed of at least two kinds of rubber which is capable of attaining both braking performance and rolling resistance. The tread portion is constructed so that the tread center zone is comprised of a rubber having a low hysteresis loss and the tread side zones adjacent to the center zone on both sides thereof or the outer layers of them are each comprised of a rubber having a high hysteresis loss; the tread center zone and the tread side zones are disposed in parallel to each other in the circumferential direction or the tread side zones are each disposed adjoining to the tread center zone and in a superposing manner.

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Nishinomiya, Japan

Toyohiko Asada