Bridgestone Corporation

Takeshi Iwatani

Kento Hashimoto

Tomotaka Sakiyama

Makoto Kurokawa

Tooru Hayashi

The tire maximum width in the reference condition is the center value or more and the upper limit or less of the tire maximum width specified in the standard, and the tire maximum width position in the reference condition is located at the position, with a distance of more than 50% of the tire cross-sectional height, outward in the tire radial direction from the bead baseline.

Run flat tire

A pneumatic tire, having in a ground contact surface of a tread a plurality of main grooves extending in the tread circumferential direction and a plurality of land portions demarcated by the main grooves and tread ends, wherein, provided that two land portions adjacent to the central land portion on the respective sides in the tread width direction of the central land portion each represent an adjacent land portion, rigidity in the tread circumferential direction of the central land portion is lower than rigidity in the tread circumferential direction of the adjacent land portion.

Pneumatic tire

A pneumatic tire is disclosed, adapted to highly effectively combine on-ice and on-snow performances. The pneumatic tire includes block groups (G) formed by polygonal blocks (), which are arranged closely in a tread portion (). The polygonal blocks () are formed by grooves () including first groove () with a groove width (W) between the polygonal blocksneighboring with each other in the tire circumferential direction. The groove width (W) of the first grooves () is larger than a groove width (W) of second grooves () between the polygonal blocksneighboring with each other with a zigzag pattern.

A pneumatic tire according to the present invention includes a tread section provided with circumferential grooves extending in a tire circumferential direction, lateral grooves extending in a tread width direction, and a plurality of land blocks defined by the circumferential grooves and the lateral grooves, each of the land blocks provided with sipes formed to extend to a predetermined depth from a tread surface inward in a tire radial direction, each of the sipes having an end portion communicating with at least any one of the circumferential grooves and the lateral grooves. At least one of the plurality of sipes includes an expanded diameter section on an inner end in the tire radial direction, and the expanded diameter section is formed to increase in diameter extending toward each of sidewalls of the land block.

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Kodaira, Japan

Takeshi Iwatani