Bridgestone Corporation

Masaharu Fukushima

Yuichi Nagai

Hiroaki Ono

Motohiro Iwasaki

Shigeaki Sugimoto

A pneumatic tire has a tread pattern designed to provide improved heat dissipation properties, wear resistance, and uneven wear resistance. The tire has arranged in a tread () two circumferential fine grooves () disposed on opposite sides of the equatorial surface (CL) of the tire and extending in the circumferential direction of the tire, and the circumferential fine grooves () define a center land section (). In the center land section () are formed oblique fine grooves () each having a first small groove () extending in the tire's circumferential direction, a second small groove () extending obliquely relative to the circumferential direction from one end of the first small groove () toward one circumferential fine groove, and a third small groove () extending obliquely relative to the circumferential direction from the other end of the first small groove () toward the other circumferential fine groove.

Heavy duty tire

Tread portion of an automobile tire

A pneumatic radial tire, particularly for a construction vehicle, has a carcass ply arranged toroidally between a pair of bead cores, containing rubber coated steel cords disposed radially therein, being turned up around each bead core from the inside to the outside of the tire and the turn-up portion of which around each bead core extends to around 1/2 height of the tire height H. When the radical length of an overlapping portion of the turn-up portion of the carcass ply and the main carcass ply is h.sub.1 and the thickness of the overlapping portion is w.sub.1 within a range of .+-.0.1 H having half height H/2 of the tire height H as the center, the radial length h and the thickness w of a reinforcing rubber material arranged between the turn-up portion of the carcass ply and the main ply satisfy the following formulae

Pneumatic radial tire with side cut resistance

Automobile tire

Growing community of inventors

Tokyo, Japan

Masaharu Fukushima