Sumitomo Rubber Industries Limited

Kotaro Tahara

Yoshifumi Kawagoe

Mari Mishima

Saki Arakawa

Hiroshi Yamaoka

Toshiki Horiguchi

Kenta Yagi

Hiroyuki Ishino

Yuki Fujimoto

Takafumi Noguchi

A tread portion includes a crown land portion including first and second longitudinal edges extending in the tire circumferential direction. The crown land portion is provided with first, second and third crown sipes. The first, second and third crown sipes open at the ground contact surface via respective chamfer portions. The first and third crown sipes extend from the first longitudinal edge and have closed ends in the ground contact surface. The second crown sipes extend from the second longitudinal edge and have closed ends in the ground contact surface. Each first crown sipe has a constant opening width in a longitudinal direction of the sipe. Each second crown sipe has a constant opening width in a longitudinal direction of the sipe. Each third crown sipe has an opening width which decreases continuously from the first longitudinal edge toward the closed end thereof.

Tire

A tire comprises a tread portion having outboard and inboard tread edges and provided with three main grooves to axially divide the tread portion into four land regions including a widest outboard middle land region, wherein first inclined grooves () extend across the entire width of the outboard middle land region; second inclined grooves () extend from a crown main groove and are terminated within the outboard middle land region; fourth inclined grooves () are connected to the second inclined grooves () and to the first inclined grooves on an outboard shoulder main groove side; and an angle of the first inclined groove () and an angle of the second inclined groove () with respect to the tire circumferential direction are gradually increases from the crown main groove toward the outboard tread edge.

A tire has a tread portion. The first middle land regionis provided with bend grooveseach having a first endand a second end. The first endis connected to the first shoulder circumferential groove. The second endis connected to one of the bend groovesnext in one of two opposite circumferential directions. Each bend groovehas two bent portionsandat which the groove is bent. The bent angle &#x3b8;at the first bent portionis greater than the bent angle &#x3b8;at the second bent portion

A tire has an intended tire rotational direction and comprises a tread portion having a tread surface defined between tread edges and a pair of buttress surfaces defined as extending radially inwardly from the respective tread edges. One or each of the buttress surfaces is provided with a plurality of protrusions protruding axially outwardly and arranged in the tire circumferential direction. The protrusions include a curved protrusion which extends radially inwardly from the tread surface while curving toward the intended tire rotational direction.

A tire comprises a tread portion. The tread portioncomprises a plurality of oblique groovesextending obliquely from a first tread edge Tepositioned on one side in a tire axial direction toward a tire equator C, and a plurality of oblique land regionseach defined between a pair of the oblique groovesadjacent to each other in a tire circumferential direction. Each of the oblique land regionsis provided with a plurality of joint grooveseach connecting between the pair of the oblique grooves

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Kobe, Japan

Kotaro Tahara