Sumitomo Rubber Industries Limited

Kohei Miyoshi

Ryota Ikeda

Yuto Ohte

Tomohisa Kuriyama

Kengo Fukuda

Daichi Takatsuki

Chisato Omori

Hiroaki Koga

A tire includes a tread portion including first and second tread edges, circumferential grooves, and land portions. The land portions include a crown land portion, a first middle land portion, and a second middle land portion. Under a 50% loaded condition, the first middle land portion, the crown land portion, and the second middle land portion respectively have axial widths W, Wc, and Wof ground contact surfaces, the widths satisfying the following formula, W>Wc>W. The crown land portion includes an outer ground contact surface and an inner ground contact surface. The outer ground contact surface and the inner ground contact surface respectively have widths Wco and Wci in the tire axial direction, the widths satisfying the following formula, Wco>Wci.

Tire

Provided is a 5-rib tire that can have improved steering stability and noise performance A tread portionincludes four circumferential groovesand five land portions. Two tread ends are ends of a 50%-load ground-contact surface. Each of the five land portionsis provided with no groove having a groove width greater than 2.0 mm, and is provided with only sipes. The five land portionsinclude a shoulder land portion. The shoulder land portionis provided with a plurality of shoulder sipes. At least one of the shoulder sipesincludes an inclined portionand an axial portion. The axial portioncross the tread end.

A tread portionincludes four circumferential groovesand five land portions. Each of the five land portionsis provided with no groove having a groove width greater than 2.0 mm, and is provided with only sipes. The four circumferential groovesinclude a shoulder circumferential groove. The five land portionsinclude a shoulder land portionand a middle land portion. The middle land portionis provided with a plurality of middle sipes. The shoulder land portionis provided with a plurality of shoulder sipeseach extending from the shoulder circumferential grooveto a position beyond a tread end. At least one of the shoulder sipesincludes an inclined portion. A maximum angle of the inclined portionwith respect to a tire axial direction is not greater than a maximum angle of the middle sipewith respect to the tire axial direction. A difference between the maximum angle of the inclined portionand the maximum angle of the middle sipeis not greater than 5°.

A tire that includes a tread portion having a designated mounting direction to a vehicle can comprise: an outer shoulder land portion having a greatest width, in the tire axial direction, of a ground contact surface among five land portions. The outer shoulder land portion can include a plurality of outer shoulder sipes connected to an outer shoulder circumferential groove. An outer middle land portion can include a plurality of outer middle sipes extending completely across the outer middle land portion in the tire axial direction. The outer shoulder sipes and the outer middle sipes each can include a pair of sipe walls. The outer shoulder sipes and the outer middle sipes can each include a body portion in which the pair of sipe walls are disposed substantially parallel to each other. A width of a body portion of each outer shoulder sipe can be greater than a width of a body portion of each outer middle sipe.

Growing community of inventors

Kobe, Japan

Kohei Miyoshi