Bridgestone Corporation

Naoyuki Goto

Hiroshi Ueda

Masahiro Kuroda

Takashi Kukimoto

Michio Ishii

Toyomi Iwata

Shohachiro Nakayama

Go Yoshida

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

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

A heavy duty pneumatic tire comprises a tread portion having a pitch pattern and provided with at least two circumferential main grooves extending circumferentially of the tire, wherein at least one dimple is arranged in a region of an island part ranging from a side end of the tread to a position corresponding to not more than 20% of a tread width per one pitch, and a pair of sipes are disposed at opposed positions of each dimple to a widthwise direction of the tire so as to extend in the widthwise direction of the tire. This dimple has a particular ratio of opening size in widthwise direction to opening size in circumferential direction, a size of not more than 8 mm, a particular depth, and a particular total opening area ratio per one pitch.

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Kodaira, Japan

Naoyuki Goto