A heavy-duty tire includes a tread portion including a crown land portion, a shoulder land portion with a tread edge and a middle land portion disposed therebetween. In a tire cross-section of a 5% inflated state, the tread portion comprises a surface profile which comprises an inner arc portion having a radius (R1) of curvature with a center located in a tire equatorial plane and an outer arc portion having a radius (R2) of curvature smaller than the radius (R1) of curvature of the inner arc portion and intersecting the inner arc portion at an inflection point (P). The inflection point (P) is located on the middle land portion, wherein a distance (Lp) in the tire axial direction from the tire equatorial plane to the inflection point (P) is in a range of from 0.35 to 0.50 times a tread half-width (Wt).

A tyre includes a tread portion provided with blocks each protruding toward a ground contact surface thereof from a tread bottom surface, and axially spaced side portions each extending from the tread portion to a respective bead portion. The blocks include shoulder blocks spaced. The shoulder blocks each include an overhanging portion located axially outside the corresponding side portion. The overhanging portion includes a pair of first walls extending in substantially parallel with a tyre meridian cross-section. The shoulder blocks have shoulder block lengths which are lengths in the tyre circumferential direction measured between the pair of first walls along the ground contact surface, wherein the shoulder block lengths are shorter than gap lengths which are lengths in the tyre circumferential direction measured on the tread bottom surface between adjacent shoulder blocks.

The pneumatic tire includes a carcass layer, a belt layer disposed on an outer side of the carcass layer in a radial direction, and a tread rubber disposed on an outer side of the belt layer in the radial direction. Additionally, the carcass layer has a cord angle of 80° or more and 100° or less. Additionally, the belt layer is formed by layering a first reinforcing belt, a second reinforcing belt that is narrower than the first reinforcing belt, and an auxiliary belt that is spaced apart from a tire equatorial plane and disposed between the carcass layer and the first reinforcing belt. Additionally, the first reinforcing belt and the second reinforcing belt have cord angles of 11° or more and 30° or less, and the auxiliary belt has a cord angle of 55° or more and 70° or less.

In a tire 2, a tread 4 includes a cap layer 38 forming a part of the outer surface of the tire 2, an intermediate layer 40 disposed inwardly of the cap layer 38 in the radial direction, and a base layer 42 disposed inwardly of the intermediate layer 40 in the radial direction. A loss tangent of the intermediate layer 40 at 30° C. is less than a loss tangent of the cap layer 38 at 30° C., and a loss tangent of the base layer 42 at 30° C. is less than the loss tangent of the intermediate layer 40 at 30° C. An outer end PC of the cap layer 38 is disposed outwardly of an outer end PB of the base layer 42 in the axial direction. In the radial direction, a position of the outer end PC of the cap layer 38 coincides with a position of the outer end PB of the base layer 42, or the outer end PC of the cap layer 38 is disposed inwardly of the outer end PB of the base layer 42.

A tire has a tread portion provided with grooves. The ground contact area of the tread portion has ground contact lengths in the tire circumferential direction which include a crown ground contact length LC at the tire equator and a shoulder ground contact length LS at a position spaced apart from the tire equator by 80% of a half tread width Tw. The crown ground contact length LC is 0.95 to 1.05 times the shoulder ground contact length LS. Groove depths of the respective grooves are determined so as to satisfy specific mathematical equations based on a reference virtual groove G0 having a predetermined groove depth d0 and defined at the tire equator.

A pneumatic tire includes, in a tread portion, main grooves extending in a circumferential direction; ribs defined by the main grooves; at least one rib comprising sipes extending in a lateral direction; the sipes comprising a chamfered sipe with a chamfer portion provided on at least one edge, and a non-chamfered sipe with no chamfer portion provided on an edge; the chamfered sipe comprising one end portion terminating in the at least one rib and another end portion communicating with one of the main grooves located on either side of the at least one rib; a plurality of the chamfered sipes communicating with one of the main grooves located on either side of the at least one rib being alternately disposed in the circumferential direction; and the non-chamfered sipe being disposed close to the chamfered sipe on at least one side in the circumferential direction.

A pneumatic tire is provided where a profile line in a tire meridian cross section of a center land portion defined by circumferential grooves and located on a tire equator is curved projecting outward in a tire radial direction. A carcass layer and a reinforcing layer include a recess portion curved projecting inward in the tire radial direction in a bottom region of the center land portion.

In a pneumatic tire, a tread average thickness A in a tire width direction region of a center land portion where a center cover layer is disposed, a tread average thickness B in a tire width direction region of the center land portion where the center cover layer is not disposed, and a tread average thickness C in tire width direction regions where second land portions located further on an outer side than the center land portion in a tire width direction and adjacent to the center land portion are defined and formed satisfy a relationship A<B<C.

A mold includes a tread-forming surface to shape a tread surface. The tread-forming surface can include projections to form circumferential grooves, and land surface-forming portions to form land surfaces. Among the three land surface-forming portions aligned in an axial direction with the projections interposed therebetween, the land surface-forming portion located between the two projections can be a curved land surface-forming portion. A contour of the curved land surface-forming portion can be represented by one or more circular arcs. A boundary between a reference side surface of each projection and the curved land surface-forming portion can be a reference boundary point, and the reference boundary point can be located inward of a reference forming surface of the tread-forming surface.

A tire comprises a tread portion comprising a shoulder land region provided with shoulder lateral grooves and circumferential sipes connecting between the shoulder lateral grooves. The shoulder lateral grooves are each provided with a chamfer. The circumferential sipes are each spaced apart from an axially inner end of the shoulder land region by an axial distance of from 30% to 100% of an axial width of the shoulder land region. The depths of the circumferential sipes are equal to or greater than the groove depths of the shoulder lateral grooves.