Bridgestone Corporation

Michio Ishii

Hiroshi Ueda

Yasuyoshi Kawaguchi

Masahiro Kuroda

Toyomi Iwata

Naoyuki Goto

Shohachiro Nakayama

Hiroshi Mouri

Seiichiro Iwafune

Toshiro Iwata

A precure tread for a tire has surface grooves facing a tread face, rear grooves facing a crown portion of a base tire, and a passage for communication between the rear grooves to atmosphere. The groove bottom of the rear grooves is located at a higher level than a groove bottom of the surface groove in the radial direction. The tire durability can be considerably improved when this precure tread is applied to a new tire or a retreaded tire.

Precure tread for retread tire

A precure tread for a tire has surface grooves facing a tread face, rear grooves facing a crown portion of a base tire, and a passage for communication between the grooves to atmosphere. The groove bottom of the rear grooves is located at a high level than a groove bottom of the surface groove in the radial direction. The tire durability can be considerably improved when this precure tread is applied to a new tire or a retreated tire.

Precure tread for tire including surface and rear grooves

Herein disclosed is a pneumatic tire which comprises a case and a tread which covers a crown portion of the case. The tread includes a foamed rubber which has a volume not less than 10% of that of the entire of the tread, and the foamed rubber is formed of a rubber composition which contains rubber components each having a glass transition point not higher than -60.degree. C.

Pneumatic tire with foam rubber in the tread

A precure tread for a tire has surface grooves facing a tread face, rear grooves facing a crown portion of a base tire, and a passage for communication between the rear grooves to atmosphere. The groove bottom of the rear grooves is located at a higher level than a groove bottom of the surface groove in the radial direction. The tire durability can be considerably improved when this precure tread is applied to a new tire or a retread tire.

Precure tread for a new tire, and retread tires

Pneumatic tire having foamed tread rubber

An adhesive for a rubber compound, comprising a water-in-oil emulsion containing a rubber, carbon black, a zinc compound, a tackifier, an organic solvent, a nonionic surfactant and water.

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Higashimurayama, Japan

Michio Ishii