Sumitomo Rubber Industries Limited

Junya Sueno

Hiroshi Ito

Rena Onitsuka

Kohei Hayama

Hiroyuki Nakayama

Daiki Imai

Masaki Terashima

Suxiang Yuan

Shigeki Nishijima

Tatsuya Sasaki

Tsukasa Yano

Yusuke Sueyoshi

Niklas Dietz

Tim Mackenroth

Axel Wildgrube

A pneumatic tire includes a tread portion, a pair of sidewall portions, a pair of bead portions, a carcass extending between the pair of bead portions, and an inner rubber extending between the pair of bead portions on an inner side of the carcass. The inner rubber includes a first portion extending in the tread portion with a first thickness and a second portion extending in each of or one of the pair of sidewall portions with a second thickness. The first thickness is greater than the second thickness. In a tire meridian cross-section, a cross-sectional area of the inner rubber is in a range from 1.5% to 10% of an inner-cavity cross-sectional area of the pneumatic tire.

Pneumatic tire

A pneumatic tire comprises: a tread portion having a ground contacting surface; a sidewall portions having an outer surface; a bead portions; a carcass extending between the bead portions; and an inner rubber extending between bead portions. The inner rubber comprises a first portion extending through the tread portion with a first thickness t, and a second portion extending through the sidewall portion with a second thickness t. The first thickness tis more than the second thickness t. In a meridian cross section of the tire under its normal state, when a first reference point (Pb), a second reference point (Pb), a shoulder reference point (Ps), a reference line segment (Lb), and a shoulder line segment (Ls) are defined, then a length (L) of the shoulder line segment (Ls) is 85.9% to 89.3% of a length (L) of the reference line segment (Lb).

In a tirea length from a center in an axial direction of a boundary between a coreand an apexof each beadto an outer end PA of the apexis not less than 10 mm and not greater than 15 mm. In a state where the tireis mounted on a normal rim and an internal pressure of the tireis adjusted to a normal internal pressure, a shape of a main body portionof a carcass plywhich is located in a zone from a boundary portion between a treadand each sidewallto the outer end PA of each apexis represented by a single circular arc, and a diameter of the circular arc is not less than 75% and not greater than 90% of a cross-sectional height of a carcass

A pneumatic tire has a tread pattern capable of improving wet performance and steering stability in a well balanced manner. An inboard middle land portion is provided with inboard middle axial grooves connecting between an inboard shoulder main groove and an inboard crown main groove and inclined at 20 to 30 degrees. An outboard middle land portion is provided with outboard middle semi-blind grooves extending axially inwardly from a outboard shoulder main groove, and outboard middle sipes extending from the axially inner ends of the outboard middle semi-blind grooves to the outboard crown main groove. The outboard middle semi-blind grooves and the outboard middle sipes are inclined at 20 to 30 degrees. A center land portion is provided with inboard crown semi-blind grooves extending from the inboard crown main groove, and outboard crown semi-blind grooves extending from the outboard crown main groove.

A pneumatic tire includes a tread having a center main groove and a pair of shoulder main grooves. A pair of middle land sections in the tread is positioned between the shoulder and center grooves. Each of the shoulder and center grooves has a groove width set in range of 7 to 9% of width of the tread footprint. An outer middle land portion is divided into first and second middle land portions by a middle narrow groove. The first land portion forms rib. The second land portion has outer middle lateral grooves connected to the center groove and the narrow groove. Each lateral groove includes first portion, second portion having the opposite inclination to the first portion and connection portion between the first and second portions. The connection portion is positioned on the center groove side from the center of the outer land portion in the axial direction.

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Kobe, Japan

Junya Sueno