A tire for a two-wheeled automotive vehicle includes a carcass that is extended on and between one of beads and the other of the beads along inner sides of a tread and sidewalls. The carcass includes a first ply and a second ply that is layered outward of the first ply. The first ply is turned up around the beads from an inner side toward an outer side in an axial direction. By the turning-up, the first ply includes a main portion and turned-up portions. The second ply is turned back around the beads from the outer side toward the inner side in the axial direction. By the turning-back, the second ply includes a main portion and turned-back portions.

Provided is a tire in which a tread half portion has a circumferential groove and land portions, an outline of a tread surface of the tread half portion includes circular arcs, the circular arc having a minimum radius of curvature is present within the outline of the land portion adjacent to a tread edge, the tread half portion has a base rubber layer, and a cap rubber layer, the base rubber layer has a lower storage modulus than the cap rubber layer, and an end of the layer in a tire width direction on a tread edge side is located in a region extending as much as 0.06 times a ground contact width of the tread half portion on each of both tire widthwise sides of a center of a tire widthwise length of an outline portion occupied by the circular arc having the minimum radius of curvature.

A tread pattern of a pneumatic tire includes circumferential grooves extending in a tire circumferential direction and sipes disposed at intervals in the tire circumferential direction in each of land portion regions in contact with the circumferential grooves, the sipes extending in a tire width direction. At least one of the land portion regions includes a first sipe and a second sipe disposed to be adjacent to the first sipe in the tire circumferential direction as the sipe, the sipe region being provided in at least a partial region in the tire width direction. A sipe width of the second sipe is wider than a sipe width of the first sipe. The sipe region is not provided with a lug groove having a wider groove width than the sipe width of the second sipe, the lug groove extending in the tire width direction.

A tire 2 has a nominal cross-sectional width not less than 355 mm and a nominal aspect ratio not greater than 70%, and includes a tread 8 having a tread surface 4 that comes into contact with a road surface, and a belt 18 located radially inward of the tread 8. A ratio of a width of the tread surface 4 to a camber amount of the tread surface 4 at an end of the tread surface 4 is not less than 20 and not greater than 30. Regarding a thickness from the belt 18 to the tread surface 4, a ratio of a thickness at an equator plane to a thickness at an end 36 of the belt 18 is not less than 0.95 and not greater than 1.05.

A tire comprises a tread portion axially divided by circumferential grooves into a first middle land portion, a crown land portion and a second middle land portion. Each land portion has a profile protruding radially outwardly from a reference tread profile. The maximum protrusion amount of the second middle land portion's profile is larger than the maximum protrusion amount of the crown land portion's profile which is larger than the maximum protrusion amount of the first middle land portion's profile.

In a tire, a tread includes a cap layer forming a part of an outer surface of the tire, a base layer disposed inwardly of the cap layer in a radial direction, and an intermediate layer disposed between the cap layer and the base layer in the radial direction. 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 loss tangent of the base layer at 30° C. is less than the loss tangent of the intermediate layer at 30° C. The tread includes at least two three-layer body portions formed of the cap layer, the intermediate layer, and the base layer, and at least one two-layer body portion that is formed of the cap layer and the base layer and disposed between a first three-layer body portion and a second three-layer body portion.

In a tire 2, in a normal state, a profile of a tread surface 22 includes a crown circular arc as a circular arc representing a profile of a portion including an equator PC, and the crown circular arc has a radius of not less than 1600 mm and not greater than 2000 mm. On a ground-contact surface 52 obtained when a load is applied to the tire 2 in the normal state and the tread surface 22 is brought into contact with a flat road surface, an ultra-light load shape index F30 is higher than a light load shape index F60, the ultra-light load shape index F30 is not less than 1.10 and not greater than 1.20, and the light load shape index F60 is not less than 1.04 and not greater than 1.14.

When (I) a tyre 1 is in contact with a flat surface (S) with a camber angle θ of 40 degrees, (II) a load (F) applied to the tyre is increased from zero, and (III) a curve (T) is obtained by plotting, in a XY coordinate, a displacement (Δx) in a tyre axial direction and a displacement (Δy) in a tyre radial direction of a position (A) of one of tyre tread edges (Te) closer to the flat surface (S), the displacements being from a reference position (A0) when the load (F) is zero, inclination of the curve (T) increases as the load (F) increases at least in a range where the load (F) is not more than 78% of a maximum load capacity load of the tyre.

A tread for a tire includes a first circumferential main groove; a second circumferential main groove; a third circumferential main groove; and a fourth circumferential main groove. The fourth circumferential main groove has a stabilizing structure for increasing tread stiffness. The stabilizing structure is axially offset a predetermined amount from a centerline of the fourth circumferential main groove. The fourth circumferential main groove has an angled axially inner sidewall, an angled axially outer sidewall, and a curved base surface. The stabilizing structure extends radially inward from the curved base surface of the fourth circumferential main groove.

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.