Bridgestone Corporation

Satoshi Yoshizaki

Yoichi Honbo

Yasuaki Tsurunaga

Motohiro Iwasaki

A pneumatic radial tire for construction vehicles comprises a radial carcass of rubberized steel cord ply, a stiffener rubber disposed on a bead core, and at least two reinforcing layers of rubberized fiber cord fabrics having different cord directions as a bead portion reinforcement. This reinforcing layer satisfies the particular height relations to the carcass ply and its turnup portion.

Pneumatic radial tires for construction vehicles

A pneumatic tire comprising a tread formed with a plurality of laterally extending groove portions and land portions which are alternatively arranged with a substantially constant pitch in a circumferential direction of the tire, wherein a land portion ratio of a total length of the land portion on a cross line, which is substantially perpendicular to the circumferential direction, to a width of the tread, varies along the cricumferential direction, has not less than two maximum values per the constant pitch and has minimum values, the maximum values each having almost the same values, and the minimum values being not less than 55 percent of the maximum values.

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Kodaira, Japan

Satoshi Yoshizaki