Abstract: The run flat tire according to this disclosure comprises a tread portion, sidewall portions, bead portions, a side-reinforcing rubber, and a carcass. An inner liner is provided on the tire inner surface, and an inner layer rubber is disposed between the side-reinforcing rubber and the inner liner. In accordance with JIS K6270, when the dumbbell-shaped No. 8 specimens having 1 mm notch in a direction perpendicular to the direction of repeated tension at the center thereof are subjected to repeated tension at a frequency of 10 Hz under the conditions of 150° C., the number of repetitions until the specimen of the inner layer rubber fails is, in the range of 10% to 30% of the tensile strain applied, at least twice that of the side-reinforcing rubber, and in the reference condition, the ratio t2/t1 is 0.05 to 0.30.

Abstract: A wear amount estimation device estimates plural kinds of wear energy depending on each of an internal pressure of aircraft tires, a load acting on the aircraft tires, a velocity of an aircraft, a slip angle caused in the aircraft tires, and a braking force of the aircraft, in accordance with each of these elements and wear energy EFR of the aircraft tires in a state of a free rolling run The wear amount estimation device estimates the wear amount wear of the aircraft tires in accordance with each of the calculated wear energy and a wear resistance R indicating a relationship between predetermined wear energy and a predetermined wear amount.

Abstract: A wear amount estimation device estimates plural kinds of wear energy depending on each of an internal pressure of aircraft tires, a load acting on the aircraft tires, a velocity of an aircraft, a slip angle caused in the aircraft tires, and a braking force of the aircraft, in accordance with each of these elements and wear energy EFR of the aircraft tires in a state of a free rolling run The wear amount estimation device estimates the wear amount wear of the aircraft tires in accordance with each of the calculated wear energy and a wear resistance R indicating a relationship between predetermined wear energy and a predetermined wear amount.

Abstract: In order to suppress an excessive increase in the temperature of a tread section, a tire includes: a first land portion that is formed to a tread section by providing plural circumferential direction grooves extending around a tire circumferential direction at a spacing in a tire width direction, and that includes plural first recesses provided around the tire circumferential direction of a wall face of the first land portion; and a second land portion that has a wider width than the first land portion, and that includes a greater number of second recesses than the number of the first recesses provided around the tire circumferential direction of a wall face of the second land portion.

Abstract: An object of the invention is to increase the room for elongation of a tread protection layer, while securing durability. An aircraft pneumatic tire 10 includes: a tread protection layer (12) that is provided at a lower layer of a tread section (22), and that includes plural cords (24) that arrayed in a tire width direction and are each disposed along a wave shaped imaginary line extending along a tire circumferential direction with the tire width direction as the amplitude direction; and cord discontinuity portions (14) where locations of close proximity of the cords (24) to each other are partially omitted in the tread protection layer (12).

Abstract: In order to suppress the dimensions and mass of an aircraft tire from becoming uneven around the tire circumferential direction, an aircraft tire includes: a belt layer provided further to a tire radial direction outside than a carcass; and a sheet shaped belt protection member that is wound around a tire circumferential direction TC between a tread section and the belt layer, and that includes incision portions incised along a tire width direction TW, with the incision portions formed at uniform intervals around the tire circumferential direction TC.

Abstract: An aircraft tire has: plural ribs, (a wide rib, narrow ribs) that are provided at a tread portion, and that are demarcated by circumferential direction grooves that extend in a tire circumferential direction; and sipes that are formed in a tire transverse direction in the respective ribs, and that have tire circumferential direction positions that differ in ribs that are adjacent to one another in the tire transverse direction.

Abstract: In order to suppress an excessive increase in the temperature of a tread section, a tire includes: a first land portion that is formed to a tread section by providing plural circumferential direction grooves extending around a tire circumferential direction at a spacing in a tire width direction, and that includes plural first recesses provided around the tire circumferential direction of a wall face of the first land portion; and a second land portion that has a wider width than the first land portion, and that includes a greater number of second recesses than the number of the first recesses provided around the tire circumferential direction of a wall face of the second land portion.

Abstract: In order to suppress the dimensions and mass of an aircraft tire from becoming uneven around the tire circumferential direction, an aircraft tire includes: a belt layer provided further to a tire radial direction outside than a carcass; and a sheet shaped belt protection member that is wound around a tire circumferential direction TC between a tread section and the belt layer, and that includes incision portions incised along a tire width direction TW, with the incision portions formed at uniform intervals around the tire circumferential direction TC.

Abstract: An object is to improve cut-resistance performance and wear-resistance performance of an aircraft tire. An aircraft tire (10) has: plural ribs (a wide rib (12), narrow ribs (14)) that are provided at a tread portion (18), and that are demarcated by circumferential direction grooves (22) that extend in a tire circumferential direction; and sipes (16) that are formed in a tire transverse direction in the respective ribs, and that have tire circumferential direction positions that differ in ribs that are adjacent to one another in the tire transverse direction.

Abstract: An object of the invention is to increase the room for elongation of a tread protection layer, while securing durability. An aircraft pneumatic tire 10 includes: a tread protection layer (12) that is provided at a lower layer of a tread section (22), and that includes plural cords (24) that arrayed in a tire width direction and are each disposed along a wave shaped imaginary line extending along a tire circumferential direction with the tire width direction as the amplitude direction; and cord discontinuity portions (14) where locations of close proximity of the cords (24) to each other are partially omitted in the tread protection layer (12).