Bridgestone Corporation

Yasuaki Tsurunaga

Akihito Goto

Satoshi Yoshizaki

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.

Off-road pneumatic tire with vibration-reducing lugged tread

Automobile tire

A pneumatic bias tire for use on rough road is disclosed, having a carcass with an improved durability. The carcass composed of not less than twelve carcass plies toroidally extending from a tread to sidewalls wherein rubber sheets are interposed between carcass plies of at least the outermost and the innermost bundles each of which comprises at least two carcass plies, the bead side ends and the tread side ends of the rubber sheets being terminated in specific regions, respectively to provide rubber material having an increased thickness between carcass plies so that the rigidity of carcass at the sidewall portion subjected to large compression strain and at the turned-back ends of carcass plies subjected to shearing strain is improved.

Growing community of inventors

Musashimurayama, Japan

Yasuaki Tsurunaga