A pneumatic tire includes an inner-side cross belt and an outer-side cross belt forming belt angles of mutually different signs with the tire circumferential direction with absolute values from 46 to 80, inclusive; a circumferential reinforcing layer arranged between the inner-side cross belt and the outer-side cross belt and forming a belt angle of 5 with the tire circumferential direction; and a supplemental belt arranged outside the outer-side cross belt in the radial direction of the tire and forming a belt angle with the tire circumferential direction with an absolute value between 10 and 45 inclusive.

Tire for an aeroplane and, in particular, the crown thereof which comprises a tread (1), a working reinforcement (2), a carcass reinforcement (3) and a hoop reinforcement (4). The radially internal working layer (21) of the working reinforcement (2) comprises a concave portion. The hoop reinforcement (41) comprises at least one hooping layer (41) radially on the inside of the working layer (21) and made up of mutually parallel reinforcing elements, having a mean diameter D, that are inclined, with respect to the circumferential direction (XX), at an angle of between +10 and 10. The hooping layer (41) comprises at least one axial discontinuity (411) having an axial width (L411) at least equal to three times the mean diameter D of the reinforcing elements of the hooping layer (41).

In a tire 2, each load support layer 22 extends from a side portion 24 of the tire 2 to a radially inner side of a belt 14 at an inner side of a carcass 12. A ratio (SP/WB) of a width SP from an equator plane to an outer edge 48 of the load support layer 22, relative to a width WB from the equator plane to an edge of the belt 14, in an axial direction is equal to or greater than 0.1 and equal to or less than 0.6.

In a pneumatic tire, a belt layer includes an inner-side cross belt and an outer-side cross belt having an absolute value of belt angle with respect to a tire circumferential direction of not less than 46 degrees and not more than 80 degrees and having belt angles with signs that are opposite to each other; and a circumferential reinforcing layer having a belt angle with respect to the tire circumferential direction within the range of 5 degrees and disposed between the inner-side cross belt and outer-side cross belt. Also, a distance Gcc on a tire equatorial plane from a tread profile to a tire inner circumferential surface and a distance Gsh from a tread edge to the tire inner circumferential surface satisfy a relationship 1.10Gsh/Gcc.

A belt layer of a pneumatic tire includes an inner-side cross belt and an outer-side cross belt forming belt angles of mutually different signs with the tire circumferential direction with absolute values from 46 to 80, inclusive; a circumferential reinforcing layer arranged between the inner-side cross belt and the outer-side cross belt and forming a belt angle of within 5 with the tire circumferential direction; and a supplemental belt arranged inside of the inner-side cross belt in the radial direction of the tire and forming a belt angle with the tire circumferential direction with an absolute value from 10 to 45, inclusive.

A pneumatic tire has a belt layer between a carcass and a tread portion. The belt layer has first and second main working belts, and a reinforcement belt. A cord angle of the reinforcement belt is not smaller than 6 degrees and not larger than 9 degrees and width thereof is equal to or wider than 50% of a tire-section width and not wider than either narrower one of the first and second main working belts. In a state where the pneumatic tire is mounted on a predetermined rim and filled with a minute internal pressure with no load applied, an arc passing points on both maximum width positions and a point on a tire equatorial plane of the reinforcement belt, in meridian section, has a radius of curvature of not smaller than 2500 mm. A total thickness T.sub.CE and T.sub.SH satisfy a relationship of 1.05T.sub.SHT.sub.CE1.35T.sub.SH.

A tire comprises, 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.