The semi-hollow pneumatic tire has an axis of revolution and comprises a sole mountable on the periphery of a rotary support, a tread opposite the sole, and two sidewalls each connecting the sole and the tread so as to form together a cover which defines an uninflated chamber inside the pneumatic tire. The tread has a concave profile according to a plane passing through the axis of revolution, and the pneumatic tire comprises two annular ridges which extend, respectively, the two sidewalls in the outer radial direction and which are connected to two opposite ends of the tread, the two annular ridges defining, respectively, two principal directions which intersect at an acute angle so that, when the pneumatic tire comes into contact with soil, by being subjected to a vertical load, the two annular ridges move closer together locally.

In a tire having a cross-sectional height from 50-150 mm, in an unloaded state mounted on a specified rim and inflated to a specified internal pressure, a distance (A) between the tire and a rim flange on a perpendicular line drawn from a rim flange outermost point in a radial direction to a tire outer surface with respect to the cross-sectional height (SH) satisfies 0.01?A/SH?0.16, and a point (S) where the rim flange separates from the tire is defined, a point (T) where the perpendicular line drawn from the rim flange outermost point in the radial direction to the tire outer surface intersects the tire outer surface is defined, two perpendicular lines are drawn from (S) and (T) to a carcass layer turned-up portion, and a cross-sectional area (Sr) of a rubber portion in a region surrounded by the two perpendicular lines and the carcass layer turned-up portion satisfies 12 mm.sup.2?Sr?101 mm.sup.2.

A pneumatic tire excellent in resistance to uneven wear, and crack resistance of a groove is provided. A position, on an equator plane, of a tread surface 20 of a tire 2 is represented as a point Pc. A position, at a maximum width, of an axially outer side surface 6a of a sidewall 6 is represented as a point Pe. A position that is a mid-point, in the radial direction, between the point Pc and the point Pe, and that is on the axially outer side surface 6a, is represented as a point Pd. When an internal pressure is enhanced from an internal pressure that is 0.05 times a normal internal pressure P to the normal internal pressure P, a value Fs of difference in amount of protrusion between an amount of protrusion Dd (mm) at the point Pd and an amount of protrusion De (mm) at the point Pe is calculated according to mathematical expression (1) in which a nominal width is represented as W (mm). The value Fs of difference in amount of protrusion is greater than 0.4 and less than 0.5.
Fs=((DdDe)/W)100(1)

Provided is a tire in which a decorative part arranged in a sidewall section is improved to enhance the visibility during traveling and to reduce the number of steps of processing a mold, whereby the mold processability and the cost performance are improved.

The tire includes a decorative band 10 formed by ridges 11 in a sidewall section 1, wherein the decorative band 10 includes a decorative element 15 constituted by repetition of a repetitive element 14, the decorative element 15 extending continuously from the tire radially inner side to the tire radially outer side of the decorative band 10 without any interruption; the repetitive element 14 is constituted by plural linear parts 16 and plural connecting parts 17 that connect the linear parts 16; the plural linear parts 16 are composed of linear parts that are oriented in 2 to 6 different directions; and angles formed by the linear parts 16 connected via the connecting parts 17 are 30 to 150.

The tire includes a summit surrounded by side portions terminating in beads provided to cooperate with a mounting rim. A carcass reinforcement is surmounted by a summit reinforcement composed of reinforcing plies. When the tire is mounted onto its standard mounting rim and inflated with its nominal pressure, each side portion has an upper side point, a bottom side point, an intermediate side point, an upper side portion, and a bottom side portion. A weight of the bottom side portion on one side portion is at least 15% lighter than a weight of the bottom side portion on another side portion.

A pneumatic tire has a designated vehicle inner/outer side orientation for when mounted on a vehicle, and includes: a reinforcing rubber layer disposed in sidewall portions on sides in a tire lateral direction, the reinforcing rubber layer having a crescent shaped meridian cross-section; wherein a radius of curvature with an arc joining intersections of straight lines and a tire external contour, and a radius of curvature with an arc joining intersections of the straight lines and a carcass layer have a relationship such that, on the vehicle outer side, a radius of curvature of the carcass layer is large with respect to a radius of curvature of the tire external contour, and on the vehicle inner side, a radius of curvature of the carcass layer is small with respect to a radius of curvature of the tire external contour.

[Object] A pneumatic tire 2 that allows achievement of reduction of rolling resistance without taking influence on a mass into consideration, is provided. [Solution] A profile OL of the tire 2 includes a ground-contact surface 46 and a pair of side surfaces 48. In the profile OL, a zone from a point PB to a point PW is formed by three arcs. The arcs are a first arc, a second arc that extends almost outward from the first arc in the radial direction, and a third arc that extends almost outward from the second arc further in the radial direction. A ratio of a radius R2 of curvature of the second arc to a radius R1of curvature of the first arc is greater than or equal to 1.45 and not greater than 3.26. A ratio of a radius R3 of curvature of the third arc to the radius R1 of curvature of the first arc is greater than or equal to 0.45 and not greater than 0.56. Each sidewall 8 of the tire 2 has a first recess 50a and a second recess 50b that are recessed inward from the side surface 48.

In a tire 2, a difference Fs (((DdDe)/W)100) in an amount of protrusion is greater than 0.4 and less than 0.5. A sum Fa (((Dd+De)/W)100) of amounts of protrusions for a sidewall 6 satisfies mathematical expressions (3) and (4) in which an aspect ratio A is used, and a difference Gs (((DaDh)/W)100) in an amount of protrusion for a tread 4 satisfies mathematical expressions (6) and (7).
0.02626A1.8615<Fa(3)
Fa<0.02626A0.6615(4)
0.010819A0.084658<Gs(6)
Gs<0.010819A+0.6713(7)

A tire that can attach and detach and that can prevent splash when running a wet road and cool discharging a heat is provided. The tire having a tread and a shoulder portion connected to the tread includes a protector portion provided in a circumferential direction at a side surface of the shoulder portion and in which a plurality of penetration portions are formed at a predetermined gap in a length direction; a plurality of protruding portions provided in the protector portion and formed at a predetermined gap in a length direction of the protector portion; and a plurality of installation grooves formed at a side surface of the shoulder portion such that the protruding portion attaches or detaches when the protruding portion enters or discharges.

A pneumatic tire includes a reinforcing rubber layer disposed in the sidewall portions and having a crescent-like meridian cross-section; wherein when the tire is assembled on a regular rim and in an unloaded state with an internal pressure of 0 kPa, a radius of curvature (RP) is larger than a radius of curvature (RO), an arc of the radius of curvature (RP) joining an intersection (Pa) of a carcass layer and a straight line (La), an intersection (Pb) of the carcass layer and a straight line (Lb), and an intersection (Pc) of the carcass layer and a straight line (Lc), and an arc of the radius of curvature (RO) joining an intersection (Oa) of the straight line (La) and a tire external contour, an intersection (Ob) of the straight line (Lb) and the tire external contour, and an intersection (Oc) of the straight line (Lc) and the tire external contour.