A tire includes a first circumferential main groove 11 and a second circumferential main groove 12 in a tread surface 1. A resonator 21 is formed in an intermediate land portion 20 partitioned between the first circumferential main groove and the second circumferential main groove. The resonator has an auxiliary groove 211 whose both ends terminate within the intermediate land portion. The groove depths D1 of the first and second circumferential main grooves are 50% or less of the groove widths W2 of the first and second circumferential main grooves, respectively. The groove depth D3 of the auxiliary groove of the resonator is 70% or more of the groove depth D1 of the first circumferential main groove.

A pneumatic tire for heavy duty having an aspect ratio of 65% or less includes a carcass and a belt layer. A tread portion includes circumferential grooves. The circumferential grooves include a pair of shoulder circumferential grooves and a crown circumferential groove. The crown circumferential groove 11 is a narrow groove and each of the shoulder circumferential grooves is a wide groove. The belt layer includes metal belt cords inclined with respect to a tire circumferential direction. The belt layer has outer ends each positioned outside a respective one of the shoulder circumferential grooves in a tire axial direction. A belt half width is 55% or more and 85% or less of a carcass half width.

A pneumatic tire comprises a tread portion provided with a pair of crown main grooves and a pair shoulder main grooves to divide middle portions and shoulder portions, the tread portion having a contact surface covered with a cap rubber layer with a loss tangent of from 0.03 to 0.18, the middle portions provided with only middle lug grooves with groove widths within 2 mm, each middle lug groove extending from one end connected either the crown or shoulder main groove to the other end terminating within the middle portion, the middle lug grooves having an angle of from 40 to 55 degrees with respect to a tire circumferential direction, and each shoulder portion provided with first shoulder lateral grooves having axially inner ends connected to the shoulder main groove, wherein first shoulder lateral grooves consist of grooves having groove widths within 2 mm.

A heavy duty tire has a carcass extending from a tread portion to a bead core in a bead portion through a sidewall portion, and a belt layer disposed on the outside of the carcass in the tire radial direction and on the inside of the tread portion. In a state in which a distance between a pair of bead heels is kept at 110% of a wheel rim width of a standard wheel rim and no inner pressure is applied, the contour shape of the tread portion is formed by a 1st circular arc having a center on the tire equatorial plane, and a pair of 2nd circular arcs, disposed on both outsides of the 1st circular arc in the tire axial direction. The radius of the 2nd circular arc is more than the radius R1 of the 1st circular arc. One 2nd circular arc has the center on the other 2nd circular arc side of the tire equator in the tire axial direction, and the other 2nd circular arc has the center on the one 2nd circular arc side of the tire equator in the tire axial direction.

In a pneumatic tire, an outer second land portion, a center land portion, and an inner second land portion have a road contact surface that partially bulges toward the outer side in a tire radial direction from a reference contour line of a tread profile in the cross-sectional view in the tire meridian direction. Additionally, a groove width Wg1 of an outer shoulder main groove, a groove width Wg3 of an inner center main groove, and a groove width Wg4 of an inner shoulder main groove have a relationship of Wg3<Wg1<Wg4, 1.05≤Wg1/Wg3≤1.25, and 1.10≤Wg4/Wg3≤1.30.

A tire having high on-ice starting performance, the tire is provided with a plurality of circumferential direction grooves formed on a tread of the tire and extending in a tire circumferential direction, a plurality of width direction grooves extending in a direction intersecting the tire circumferential direction, a plurality of blocks demarcated by the circumferential direction grooves and the width direction grooves, and a plurality of width direction sipes formed on surfaces of the blocks and extending in the direction intersecting the tire circumferential direction, in which a distance P between the sipes 18z is set in a range of 4-12 mm.

A heavy duty pneumatic tire includes a tread portion provided with at least one circumferentially extending main groove, at least one circumferentially extending sub groove, and a plurality of lateral grooves to form repeated pitch elements each of which consists of one lateral groove and a block element. The sub groove includes a shallow bottom part with a depth smaller than that of the main groove. The shallow bottom part of the sub groove is provided with a groove bottom sipe. The lateral grooves include a shallow bottom part with a depth smaller than that of the main groove. The shallow bottom part of the lateral groove is provided with a groove bottom sipe. The lateral grooves have groove widths W2 in a range of from 5% to 15% in relation to a circumferential length L1 of the pitch element.

A pneumatic tire comprises a tread portion provided on each side of the tire equator with a middle land portion defined between a shoulder main groove and a crown main groove each extending continuously in the tire circumferential direction. The middle land portion is provided with axially inside middle lug grooves and axially outside middle lug grooves arranged alternately in the tire circumferential direction. The axially inside middle lug groove is connected to the crown main groove at an angle θ1 of from 20 to 45 degrees with respect to the tire circumferential direction and has an axially inner opened end and an axially outer closed end. The outside middle lug grooves is connected to the shoulder main groove at an angle θ2 of from 60 to 80 degrees with respect to the tire circumferential direction and has an axially outer open end and an axially inner closed end. The tread portion may be provided with a shoulder land portion comprising circumferential sipes, axial grooves terminating at the circumferential sipes, and a circumferentially continuous rib.

A pneumatic tire including a tread portion, side wall portions, and bead portions, wherein the tread portion includes a plurality of circumferential grooves having a groove width of not less than 3.0 mm and which extend in a tire circumferential direction while meandering, and a plurality of lateral grooves having a groove width of not less than 3.0 mm and which communicate between a pair of circumferential grooves adjacent in a tire width direction. The circumferential grooves and the lateral grooves partition two rows of polygonal blocks formed by arranging a plurality of polygonal blocks, having a polygonal shape with not less than five corners, in a staggered manner along the tire circumferential direction. A polygonal rib extending in the tire circumferential direction is disposed between the two rows of polygonal blocks. The polygonal rib is adjacent to the two rows of polygonal blocks.

A pneumatic tire comprises a tread portion which is asymmetric about a tire equatorial plane. The tread portion comprises a first land portion on a vehicle outer side, and a second land portion on a vehicle inner side. The first land portion comprises a circumferential narrow groove extending in a circumferential direction, a plurality of first auxiliary grooves that pass through the circumferential narrow groove and are disposed at periodic intervals in the circumferential direction, first blocks defined by the plurality of first auxiliary grooves, and first narrow grooves that pass through the circumferential narrow groove and are disposed in the first blocks. The second land portion comprises a plurality of second auxiliary grooves disposed at periodic intervals in the circumferential direction, second blocks defined by the plurality of second auxiliary grooves, and second narrow grooves disposed in the second blocks.