The inner tube is a circular rubber tube equipped with a valve for filling or discharging air. The inner tube is filled with compressed air under certain pressure. Generally, tires with a pressure range of 0.5~0.7MPa are called high-pressure tires, tires with a pressure range of 0.15~0.45MPa are called low-pressure tires, and tires below 0.15MPa are called ultra-low-pressure tires. Almost all cars and trucks use low-pressure tires, which have good elasticity, wide cross-section, large contact surface with the road, thin walls, and good heat dissipation, thus improving the smoothness of driving and stability of steering control. At the same time, the lifespan of roads and tires themselves has also been extended. However, due to the improvement of rubber performance, the load capacity of the tires has been greatly improved. Although the tire pressure is already within the range of high-pressure tires, the cushioning performance of the tires still maintains the original low-pressure tire performance of the same specification, and this type of tire is still classified as low-pressure tires.