6.2.5.h Camera
The tube keeps the compressed air inside the tire. It is an elastic rubber shell in the form of a closed tube. For a tight fit (no wrinkles) inside the tire, the inner tube dimensions are slightly smaller than the inner cavity of the tire. Therefore, the air-filled tube is in a stretched state inside the tire. Tube wall thickness is usually 1.5-2.5 mm for passenger car tires and 2.5-5 mm for truck and bus tires. Radial grooves are made on the outer surface of the tube. They help evacuating the air, which remains between the tube and the tire after mounting the tire. Tubes are made out of high-strength rubber.
2 MB