Sumitomo Rubber Industries Limited

Koji Hayashi

Kenji Ueda

Masahiro Tatsuta

Ryo Oba

Masahiro Nagase

Masaki Terashima

Junya Tamai

Masaya Ito

Masatomo Nakamura

Provided is a tire provided with a mark capable of reducing the air resistance during tire rotation while maintaining good visibility. A tire is provided with a mark on a tire side portion. The mark includes a first mark located on an outer side in a tire radial direction, and a second mark located inward of the first mark in the tire radial direction. Each of the first mark and the second mark includes a recess that is recessed from a side profile surface of the tire side portion. A depth of the recess of the first mark from the side profile surface is smaller than a depth of the recess of the second mark from the side profile surface.

Tire

A pneumatic tireis provided in the tread portionwith crown blockseach circumferentially divided into two block pieces, and shoulder blockseach circumferentially partially divided into two block pieces. The block piecesof the crown blockare a first block pieceA having an axially outer crown chamferabutting on a shoulder main groove, and a second block pieceB having no chamfer abutting on the shoulder main groove. The block piecesof the shoulder blockare a first block pieceA having an axially inner shoulder chamferabutting on the shoulder main groove, and a second block pieceB having no chamfer abutting on the shoulder main groove. On both sides of the shoulder main groove, the axially inner shoulder chamfersare partially circumferentially overlapped with the axially outer crown chamfers

Pneumatic tire

A pneumatic tire has a shoulder land zone provided with lateral grooves arranged at variable pitches in the tire circumferential direction and extending at an angle of not more than 30 degrees with respect to the tire axial direction. The domains defined between the shoulder lateral grooves include a smallest domain having the smallest circumferential length and a largest domain having the largest circumferential length. The domains are each provided with at least one sipe extending at an angle of not more than 30 degrees with respect to the tire axial direction. The number of the sipe(s) in the smallest domain is less than the number of the sipes in the largest domain.

Pneumatic tire with tread having sipes

A pneumatic tire has a tread portion divided into a crown rib, a pair of middle ribs and a pair of shoulder ribs by two crown main grooves and two shoulder main grooves. The width of the crown main groove is 5.5 to 7.5% of the tread width. The width of the shoulder main groove is 50 to 70% of the crown main groove width. The crown rib has crown sipes extending from the crown main grooves. The middle rib has axially inner middle sipes extending axially outward from the crown main groove and ending within the middle rib, and axially outer middle sipes extending axially inward from the shoulder main groove and ending within the middle rib. The shoulder rib has shoulder sipes extending axially outward from the shoulder main groove, and shoulder lug grooves extending axially inward from the tread edge ending within the shoulder rib.

Growing community of inventors

Kobe, Japan

Koji Hayashi