A pneumatic tire is provided with, in the tread surface, land portions that include a rib or a plurality of blocks. The land portions are provided with a plurality of narrow shallow grooves and a plurality of recessed portions in a contact patch. Additionally, the opening area ratio Sc of the recessed portions in the central portion region in the tire lateral direction of one continuous contact patch and the opening area ratio Se of the recessed portions in the end portion regions in the tire lateral direction have the relationship Se<Sc, where the central portion region is defined as the region in the central portion in the tire lateral direction occupying 50% of the continuous contact patch of the land portions, and the end portion regions are defined as the regions in the left and right end portions in the tire lateral direction occupying 25%.

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.

A tire comprises a tread portion including a shoulder land portion. The shoulder land portion is provided with shoulder lateral grooves extending from a shoulder circumferential groove to a first tread edge to divide the shoulder land portion into shoulder blocks. The axial width of the ground contacting top surface of each shoulder block is 35% to 48% of a half tread width from the tire equator to the first tread edge. The ground contacting top surface of each shoulder block is provided with only one or more shoulder sipes extending in a tire circumferential direction.

A tread pattern of a pneumatic tire includes continuous lands provided in half treads on first and second sides, circumferential main grooves, and sipes having a chamfered configuration. The sipes extend inward in a lateral direction from the circumferential main grooves and are closed in the middle of regions of the continuous lands. An edge shape of each of sipes on the first side includes an extending portion extending inward in the lateral direction constantly in an extension direction and a bent portion that is provided to be joined to an end of the first extending portion and that has the edge shape bent from the extension direction of the first extending portion to a direction close to the circumferential direction. Every portion of the first extending portion and the bent portion of the sipes are provided with a main body portion and a sipe chamfered portion.

A pneumatic tire has inner mediate land portions and center land portion(s) that are divided into a plurality of blocks by lateral grooves. Each of the lateral grooves includes a pair of wide portions opening to a main groove and a narrow portion coupling the pair of the wide portions. one-side-closed sipes are formed in a bottom of each of the lateral grooves formed in the inner mediate land portions. The one-side-closed sipes are open at the wide portions and close at the narrow portion. a both-sides-open sipe is formed in a bottom of each of the lateral grooves formed in the center land portion or portions. The both-sides-open sipe is open at the wide portions and at the narrow portion.

A tire 1 comprises a tread portion 2 provided with an outer shoulder main groove 3 in a part closest to an outside tread edge (To) and an outer crown main groove 4 on a side of an inside tread edge (Ti) of the outer shoulder main groove 3 both extending continuously in the tire circumferential direction, and outer transverse grooves 9 connecting between the outside tread edge (To) and the outer crown main groove 4 so that an outer shoulder land region 7A is defined between the outside tread edge (To) and the outer shoulder main groove 3 and an outer middle land region 7B is defined between the outer shoulder main groove 3 and the outer crown main groove 4. A maximum axial width Ws of the outer shoulder land region 7A is larger than a maximum axial width Wm of the outer middle land region 7B.

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 pneumatic tire (10) has, in the surface of the tread (11), a central circumferential groove (12) located at the center of the contact patch width and extending circumferentially around the tire, a plurality of longitudinal grooves (13 (13a, 13b)) formed on the axially outside of the central circumferential groove (12), lug grooves (15), and blocks (16 (16a to 16c)) defined by the central circumferential groove (12), the longitudinal grooves (13), and the lug grooves (15). Each of the lug grooves (15) is formed such that its width in the shoulder region is greater than its width in the central region, and the sum of the groove area of the central circumferential groove (12) and the groove area of the longitudinal grooves (13) is smaller than the area of the lug grooves (15). As a result, the pneumatic tire (10) not only secures the wet braking performance and wear resistance performance on paved roads, but also improves the acceleration performance and braking performance and the steering stability performance on snowy roads.

When a tire is attached to a rim and set to an internal pressure of 250 kPa or more, a ratio SW/OD of the tire is 0.26 or less in the case where SW of the tire is less than 165 (mm), and SW and OD satisfy a relationship 2.135×SW+282.3≦OD in the case where SW is 165 (mm) or more. The tread rubber has dynamic storage modulus E′ of 6.0 MPa to 12.0 MPa, and loss tangent tan δ of 0.05 to 0.15. In at least one land portion, sipes are arranged with a predetermined pitch length L, and a land portion width W, a tire widthwise sipe component total length Ws of the sipes, the pitch length L, and a tire circumferential sipe component total length Ls of the sipes satisfy relationships 0.4W≦Ws≦1.2W and 0.6L≦Ls≦3L.