The Yokohama Rubber Co., Ltd.

Kohtaro Matsushita

Izumi Kuramochi

Takumi Morito

Yukio Kuroda

In a pneumatic tire, land portions have a plurality of sipes and at least one row of land portions in an inner side region is provided with sipes having a 3D structure. Also, the snow traction index (STI) with respect to the tire circumferential direction throughout the entire tread portion is in the range of 100&#x2264;STI. Also, the sipe component (STI_s_out) of the snow traction index (STI) in an outer side region and the sipe component (STI_s_in) of the snow traction index (STI) in the inner side region have the relationship of 1.1&#x2264;STI_s_in/STI_s_out. Also, the peripheral length ratio PLR_out of the three-dimensional structure portion in the outer side region and the peripheral length ratio PLR_in of the three-dimensional structure portion in the inner side region have the relationship of 1.1&#x2264;PLR_in/PLR_out.

Pneumatic tire

A pneumatic tire includes first and second side members at first and second sides and a tread section between the first and second side members. The tread section has a tread pattern including a pair of main grooves extending linearly in a circumferential direction of the tire and a land section extending in the circumferential direction between the main grooves. The land section includes a sub groove extending in the circumferential direction without connecting to the main grooves, and a first sipe connecting between the sub groove and one of the main grooves. The sub groove includes a first groove section extending diagonally toward the first side at 0 to 30 degrees with respect to the circumferential direction and a second groove section connecting to the first groove section and extending diagonally toward the second side at 10 to 45 degrees with respect to the circumferential direction.

Provided is a pneumatic tire capable of providing improved lateral sliding resistance on snow, improved traction on snow, and improved uneven-wear resistance. The provided tire includes: at least one circumferential main groove formed in a tread portion and extending in the tire-circumferential direction; and plural columns of land areas defined in the tread portion by the circumferential main groove. Plural lug grooves and plural sipes are formed in at least one of the plural land-area columns. Each of the lug grooves extends in the tire-width direction. At least one end of each lug groove is formed as a dead end located in the corresponding land area. Each of the sipes extends so as to surround the corresponding lug groove. Each sipe intersects with the lug groove in question, and is communicatively connected to the corresponding single one of the circumferential main grooves at the two ends of the sipe.

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Hiratsuka, Japan

Kohtaro Matsushita