Abstract: An object is to improve durability without increasing the tire mass. An aircraft pneumatic tire (10) includes: a carcass ply (12) that straddles between a pair of bead portions (24); an inside belt layer (14) that is provided at a tire radial direction outer side of a crown portion of the carcass ply (12); an outside belt layer (16) that is provided at the tire radial direction outer side of the inside belt layer (14) and that is configured by a cord of cord configuration elements that have been twisted together; a belt protection layer (18) that is provided at the tire radial direction outer side of the outside belt layer (16) and that is configured by a cord of cord configuration elements that have been twisted together; and a low elasticity portion that is provided at at least one of the cord of the belt protection layer (18) or the cord of the outside belt layer (16), and that has a lower elasticity than other length direction portions of the cord (32).

Abstract: An object is to improve durability without increasing the tire mass. An aircraft pneumatic tire (10) includes: a carcass ply (12) that straddles between a pair of bead portions (24); an inside belt layer (14) that is provided at a tire radial direction outer side of a crown portion of the carcass ply (12); an outside belt layer (16) that is provided at the tire radial direction outer side of the inside belt layer (14) and that is configured by a cord of cord configuration elements that have been twisted together; a belt protection layer (18) that is provided at the tire radial direction outer side of the outside belt layer (16) and that is configured by a cord of cord configuration elements that have been twisted together; and a low elasticity portion that is provided at at least one of the cord of the belt protection layer (18) or the cord of the outside belt layer (16), and that has a lower elasticity than other length direction portions of the cord (32).

Abstract: In a belt layer structured by a plurality of zigzag endless belts which are layered in a tire radial direction and are folded-over at both ends in a tire widthwise direction and are disposed uniformly over an entire region, an angle ?1 of an inner side cord portion and a tire equatorial plane, an angle ?2 of an outer side cord portion and the tire equatorial plane, and an angle ?M of an intermediate cord portion and the tire equatorial plane, are ?1>?M>?2.

Abstract: In a belt layer structured by a plurality of zigzag endless belts which are layered in a tire radial direction and are folded-over at both ends in a tire widthwise direction and are disposed uniformly over an entire region, an angle ?1 of an inner side cord portion and a tire equatorial plane, an angle ?2 of an outer side cord portion and the tire equatorial plane, and an angle ?M of an intermediate cord portion and the tire equatorial plane, are ?1>?M>?2.

Abstract: A bias tire for an aircraft includes a laminate formed by laminating a plurality of plies intersecting with each other and reinforced by organic fiber cords having a large thermal contraction coefficient. Both ends of the plies are turned up around bead cores. A profile curve I of a representative ply corresponding to that number counted from an innermost ply of the laminate plus one, which is one half of a total number of the plies when the tire mounted on a normal rim is filled with 1% of a normal inner pressure is constructed by a smoothly changing crown profile curve J and a smoothly changing side profile curves K. The crown profile curve J intersects a natural equilibrium profile curve H and is positioned between natural equilibrium profile curves E and H between both shoulder ends.