A tire includes a circumferential narrow main groove extending in a tire circumferential direction provided in a tread portion. The circumferential narrow main groove includes a narrow groove portion having a groove width W1 in a range of 1.0 mm≤W1≤4.0 mm in a region where a groove depth from a road contact surface of the tread portion is less than 30%, and a widened portion having a maximum groove width W2 more widened than the groove width W1 in a region where the groove depth is 30% or more.

A circumferential narrow main groove extending in a circumferential direction in a tread of a pneumatic tire. The circumferential narrow main groove includes a narrow portion opening to a road contact surface of the tread and a widened portion having a wider groove width than the narrow portion. The widened portion is at a groove bottom. A groove width ratio (W2/W1) of a maximum groove width W2 of the widened portion to a groove width W1 of the narrow groove portion is in a range 1.5≤(W2/W1)≤4.0, and a cross-sectional area ratio (A2/A1) of a groove bottom-side cross-sectional area A2 to a groove opening-side cross-sectional area A1 in a meridian cross-section is within a range 1.2<(A2/A1)<4.0 when the circumferential narrow main groove is divided into two parts at 50% of a maximum groove depth of the circumferential narrow main groove. The cross-sectional area ratio changes along the circumferential direction.

In a state in which the pneumatic tire is mounted on a regular rim and inflated to 5% of a specified internal pressure, a tread width is TW, a total tire width is SW in a tire meridian cross-sectional view, a relationship of 0.80≤TW/SW≤0.95 is satisfied, a ground contact width at a load of 100% of a maximum load capacity is CW100, a ground contact width at a load of 70% of the maximum load capacity is CW70, and a relationship of 1.04≤CW100/CW70≤1.15 is satisfied.

This pneumatic tire includes a carcass layer, a pair of cross belts disposed on an outer side of the carcass layer in a radial direction, and a tread rubber including a cap tread and an undertread that are layered, the tread rubber being disposed on the outer side of the cross belts in the radial direction. Additionally, the loss tangent tan δ_cap of the cap tread 151 at 60° C. has the relationship tan δ_ut<tan δ_cap with respect to the loss tangent tan δ_ut of the undertread 152 at 60° C. In addition, a maximum gauge UT_ce of the undertread in center land portions has the relationship 1.20≤UT_ce/UT_sh≤2.50 with respect to a maximum gauge UT_sh of the undertread in ground contact regions of shoulder land portions.

A tire comprises a tread portion provided with grooves. When the tire mounted on a standard wheel rim and inflated to a standard tire pressure is placed on a flat surface at a camber angle of zero and loaded with a standard tire load, the tire has a ground contacting patch. The depths of the respective circumferential grooves, and ground contact lengths of the ground contacting patch measured at axial positions of the respective circumferential grooves, are in a relationship in which the groove depth increases or decreases as the ground contact length increases or decreases.

An object of the present invention is to provide a heavy duty tire having improved fuel efficiency, wet grip performance, abrasion resistance, chipping resistance, and tear resistance with good balance. The heavy duty comprises a carcass extending from a tread part through a sidewall part to a bead core of a bead part and a belt layer arranged outside in a tire radial direction of the carcass and inside of the tread part, wherein the tread has a cap rubber layer and a base rubber layer, the cap rubber layer comprises a predetermined rubber component and silica and the loss tangent tan δ of the base rubber layer is within a predetermined range.

An object of the present invention is to provide a heavy duty tire having improved fuel efficiency, wet grip performance, abrasion resistance, chipping resistance, and tear resistance with good balance. The heavy duty comprises a carcass extending from a tread part through a sidewall part to a bead core of a bead part and a belt layer arranged outside in a tire radial direction of the carcass and inside of the tread part, wherein the tread has a cap rubber layer and a base rubber layer, the cap rubber layer comprises a predetermined rubber component and silica and the loss tangent tan δ of the base rubber layer is within a predetermined range.

An object of the present invention is to provide a heavy duty tire having improved fuel efficiency, wet grip performance, abrasion resistance, chipping resistance, and tear resistance with good balance. The heavy duty comprises a carcass extending from a tread part through a sidewall part to a bead core of a bead part and a belt layer arranged outside in a tire radial direction of the carcass and inside of the tread part, wherein the tread has a cap rubber layer and a base rubber layer, the cap rubber layer comprises a predetermined rubber component and silica and the loss tangent tan δ of the base rubber layer is within a predetermined range.

A tire comprises a tread portion provided with grooves. When the tire mounted on a standard wheel rim and inflated to a standard tire pressure is placed on a flat surface at a camber angle of zero and loaded with a standard tire load, the tire has a ground contacting patch. The depths of the respective grooves, and ground contact lengths of the ground contacting patch measured at axial positions of the respective grooves, are in a relationship in which the groove depth increases or decreases as the ground contact length increases or decreases.

A pair of main grooves disposed on both sides of a tire equator of a pneumatic tire and extending along a tire circumferential direction is configured so that a series of bent elements formed by connecting at least five linear groove portions via bend points are continuously and repeatedly arranged in the tire circumferential direction, and the at least five linear groove portions included in each of the bent elements have three or more types of inclination angles with respect to the tire circumferential direction and have five or more types of lengths.