Introduction to basic knowledge of motorcycle tires

When you buy a car, the manufacturer specifies the nature of the tires, the inner diameter, and the rim size of the wheels. However, tires are consumables and will start to wear as soon as the wheel rotates. The speed of wear is related to many factors. The service life of the same tire is also different depending on the road surface it travels on, the load it carries, the driving skills, and the level of care and maintenance. Therefore, when the tires reach a certain mileage, they should be replaced. Generally, the tire grooves should not be less than 2mm; otherwise, poor grip will lead to sideslip on curves, and dangerous accidents such as tire blowouts may occur when driving at high speeds. These are related to the safety of the driver's life, so we should attach great importance to them.

If you want to roughly classify tires, they can be divided into two types: tubeless tires and tubeless tires (usually what car repairmen call tubeless tires). The principle of inner tube tires is to keep the air in the inner tube, and it does not require 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 and causing a leak. Therefore, tubed tires are commonly used on off-road vehicles and American street vehicles that use rims and steel wires. The principle of tubeless tires is to use the special structure of the rim of the steel ring (rim) and the edge of the tire to seal the air in the carcass. Even if this type of tire is punctured by a foreign object, the air will not escape immediately, and it is also easy to repair, making it very popular among motorcycle enthusiasts. In recent years, tubeless tires have gradually been used on ordinary motorcycles. It can be seen that the two types of tires have their own advantages.

Usually, qualified tires are marked with specifications, maximum load, inflation pressure, standard rims and trademarks, factory name, and direction. For example, the tire is marked with specifications 90/90-18 51S. Among them, the first 90 indicates the width is 90mm; the 90 after "/" indicates the aspect ratio (%), that is, the height is 90% of the width; the 90 after "-" 18 means that the inner diameter of the tire is 18 inches (1 inch = 2.54cm). Some tires do not have an aspect ratio marked, which means the aspect ratio is 100%, that is, the width is equal to the height.