Sumitomo Rubber Industries Limited

Shingo Nobukuni

Tomoyuki Mukai

Naoya Nagahara

Eiki Osawa

You Toshima

A tire can include a tread portion and a buttress portion. The tread portion can include a crown region between a tire equator and a middle position and a shoulder region between a first tread ground-contact end and the middle position. The buttress portion can have a land ratio which is a land portion ratio between the first tread ground-contact end and a first position. A land ratio of the shoulder region can be larger than a land ratio of the crown region and the land ratio of the buttress portion.

Tire

Provided is a tirethat can achieve reduction of rolling resistance while reducing a decrease in durability to be small. An apexof each beadincludes an apex body, a strip apex, and an intermediate apex. An inner end of the strip apexis located between a ply bodyof a carcass plyand the apex body. An inner end of the intermediate apexis located between the strip apexand the apex body. An outer end of the apex bodyis located between the inner and outer ends of the intermediate apex. The intermediate apexis located between the inner and outer ends of the strip apex. The intermediate apexis harder than the apex body, and the strip apexis harder than the intermediate apex

A tire includes a tread portion. The tread portion is provided with grooves each having a pair of groove walls. At least one of the groove walls is provided on a surface thereof with a pattern portion having a plurality of micro-protrusions. The pattern portion is provided with the micro-protrusions at a density of 1 to 5 per 1 mmof the groove wall area.

A tire includes a tread portion being provided with a circumferentially and continuously extending outboard shoulder main groove, a circumferentially and continuously extending outboard crown main groove disposed between the outboard shoulder main groove and a tire equator, and an outboard middle land portion disposed between the outboard shoulder main groove and the outboard crown main groove. The outboard middle land portion is provided with a plurality of first outboard middle lug grooves extending from the outboard crown main groove and terminating within the outboard middle land portion, and a plurality of second outboard middle lug grooves extending from the outboard shoulder main groove and terminating within the outboard middle land portion, wherein the second outboard middle lug grooves are larger than the first outboard middle lug grooves in length in a tire axial direction.

Growing community of inventors

Kobe, Japan

Shingo Nobukuni