What is the structure of motorcycle inner tube

To roughly classify tires, they can be divided into inner tube tires and tubeless tires (vacuum tires commonly referred to by car repairmen). The principle of inner tube tire is to keep the air in the inner tube without requiring precise contact between the tire and the rim. Even if the air pressure is low, there is no need to worry about the tire falling off the wheel, resulting in air leakage. Therefore, inner tube tires are widely used in off-road vehicles and American street vehicles using rims and steel wires. The principle of tubeless tire is to seal the air in the carcass by using the special structure of the rim of the steel ring (RIM) and the edge of the tire. Even if the tire is stabbed by a foreign body, the air will not disappear immediately, and the repair of a flat tire is very convenient, so it is very popular with motorcycle friends. In recent years, tubeless tires have gradually been used on ordinary motorcycles. It can be seen that the two kinds of tires have their own advantages. Generally, qualified tires are marked with specification, maximum load, inflation internal pressure, standard rim, trademark, manufacturer name and direction. If the specification 90 / 90-18 51s is marked on the outer tire, the first 90 indicates that the width is 90mm; 90 after "/" represents the flat ratio (%), that is, the height is 90% of the width; 18 after "-" means that the inner diameter of the tire is 18 inches (1 inch = 2.54cm). If some tires are not marked with flat ratio, it means that the flat ratio is 100%, that is, the width is equal to the height.