Bridgestone Corporation

Bridgstone Corporation

Shigehito Kishinami

Hiroshi Yamaguchi

Hiroshi Ueda

Fumio Bamba

Satoshi Konishi

Toshiyuki Watanabe

The bead durability of the heavy duty pneumatic radial tire for truck and bus is improved by arranging a rubber stock composed of three rubbers A, B and C each having particular properties between a carcass ply and its turnup portion in the bead portion and/or rendering the turnup portion of the carcass ply in the bead portion into a particular arrangement.

Heavy duty pneumatic radial tires with specified carcass turnup

Heavy duty pneumatic radial tires with three piece rubber stocks

A method of mounting dual tires on motor vehicles, in which the tires have lateral grooves in the circumferential direction includes positioning the tires so that the neighboring lateral grooves on the respective tire faces nearest each other have phase differences in the circumferential direction. The phase difference between the neighboring lateral grooves is preferably one half of a pitch and the pitch is preferably smaller than 16 cm, and more preferably smaller than 13 cm.

Dual tire mounting method

Growing community of inventors

Higashiyamato, Japan

Shigehito Kishinami