In a tire, a shape index of a reference ground contact surface is not less than 1.20 and not greater than 1.50. In the tire, a tread includes a cap layer, an intermediate layer formed such that a loss tangent of the intermediate layer at 30° C. is less than a loss tangent of the cap layer at 30° C. and a base layer formed such that a loss tangent of the base layer at 30° C. is less than the loss tangent of the intermediate layer at 30° C. In the radial direction, the intermediate layer is disposed outwardly of the base layer and the cap layer is disposed outwardly of the intermediate layer. In a shoulder land portion of the tread, a thickness of the cap layer at a center of an axial width is less than a thickness of the cap layer on the shoulder circumferential groove side.

The ground contact end is an end of a tread surface in the tire width direction in a state where the tire at an internal pressure of 230 kPa is under a load of 70% of the maximum load according to the load index. The predetermined region T is a region in a portion outside the ground contact end in the tire width direction and is defined between the ground contact end and a location spaced apart from the ground contact end by a distance corresponding to 8% or more and 15% or less of a width from the ground contact end to the other ground contact end in the tire width direction. The predetermined direction forms an angle of 0 degrees or more and 35 degrees or less with respect to a circumferential direction of the tire.

The invention is a tyre comprising, in the central part of its crown, at least one undulation (51) of the radially outermost crown layer, having a radial amplitude A at least equal to 1 mm. At least one bead comprises, aside from the radial carcass layer and the bead wire, a radial reinforcing element that is such that the axial distance between the radial reinforcing element and the axially innermost carcass layer is at least equal to 1 mm and at most equal to 12 mm at the point of the radial reinforcing element that is situated 30 mm from the radially innermost point of the bead wire, for a better trade-off between the stiffness of the undulating crown and of the bead.

A tire has a tread portion provided with circumferential 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 C and a shoulder ground contact length LS at a position spaced apart from the tire equator C 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 circumferential grooves are proportional to ground contact lengths of the ground contact area at the respective axial positions of the circumferential grooves.

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.

In a pneumatic tire, a plurality of main grooves include at least one straight main groove for which end edges at a tread surface are respectively parallel to a tire circumferential direction, and at least one zigzag main groove for which end edges at the tread surface are respectively inclined with respect to the tire circumferential direction, the end edges at the tread surface of the at least one zigzag main groove include an inner end edge which is arranged toward an interior in a tire axial direction, and an outer end edge which is arranged toward an exterior in the tire axial direction, and an outwardmost location in the tire axial direction of the inner end edge is arranged toward the interior in the tire axial direction from an inwardmost location in the tire axial direction of the outer end edge.

A pneumatic tire includes a plurality of main grooves formed in a tread and extending along a tire circumferential direction, wherein the plurality of main grooves include a shoulder main groove located on an outermost side in a width direction, the shoulder main groove includes a raised portion formed by raising a first side, in the tire width direction, of a groove bottom of the shoulder main groove more than a second side of the groove bottom, and the raised portion is lower than an outer surface of the tread and continuously extends over an entire circumference in the tire circumferential direction.

In a tire, each of first and second circumferential grooves include groove portions arranged discontinuously in a row in a circumferential direction. The groove portions are arranged in a staggered manner in the circumferential direction. A distance D1 from an equatorial plane to a center line of the first circumferential groove and a distance D2 from the equatorial plane to a center line of the second circumferential groove satisfy 0.90≤D2/D1≤1.10. A maximum groove width W1 of the groove portion of the first circumferential groove and a maximum groove width W2 of the groove portion of the second circumferential groove satisfy 0.90≤W2/W1≤1.10. A maximum circumferential length L1 of the groove portion of the first circumferential groove and a maximum circumferential length L2 of the groove portion of the second circumferential groove satisfy 0.90≤L2/L1≤1.10.

A tire includes a mounting direction indicator that indicates a tire mounting direction with respect to a vehicle. The tire includes a first circumferential groove and a second circumferential groove extending intermittently or continuously in a tire circumferential direction. Additionally, the second circumferential groove is located further on an inner side than the first circumferential groove in a vehicle width direction in a state in which the tire is mounted on a vehicle. Additionally, a groove volume V1 of the first circumferential groove and a groove volume V2 of the second circumferential groove have the relationship V1<V2.

A tire includes a mounting direction indicator indicating a tire mounting direction with respect to a vehicle. Additionally, the tire includes a first circumferential groove and a second circumferential groove extending intermittently or continuously in a tire circumferential direction. Additionally, the second circumferential groove is located further on an inner side than the first circumferential groove in a vehicle width direction in a state in which the tire is mounted on a vehicle. In addition, a distance D1 from the tire equatorial plane to the groove center line of the first circumferential groove and a distance D2 from the second circumferential groove to the groove center line have the relationship D1<D