Basic knowledge of motorcycle tires

Tires must have the four basic functions of "supporting the car and carrying weight", "transmitting the driving force, braking force", "changing and maintaining the direction of the car", and "mitigating the flushing from the road surface".

The thing that has these four basic functions is called the "elastic air container", which is known as the air-injected tire.

Support body weight and weight

Supporting the weight of the car body, personnel, luggage, etc., mainly using the amount of air and pressure inside the tire to support the weight and load of the car body, so it is very important to maintain proper air pressure.

Communicate driving force and braking force

In order to make the car forward or stop, it is necessary to convey the power of the engine and the brake to the road surface. This is mainly through the friction of the tire rubber. When the rapid start or emergency braking exceeds the limit of the tire, the car is idling and slipping. The situation is very dangerous.

Change and maintain the direction of the car

The car turns or keeps straight in the direction of the knight's control. This function is mainly performed by the friction and elasticity of the tire rubber and the firmness of the tire structure. Once the speed is too fast, the speed exceeds the limit of the tire. It is very dangerous to go forward in the direction of turning, so please pay attention to the driving speed when riding.

Alleviate the rush from the road

This is also the so-called "riding comfort" performance, which can alleviate the bumpy impact caused by the bumpy road surface. This function is mainly through the amount of air and pressure in the tire, the elasticity of the rubber and the elasticity of the tire structure. If the tire pressure is too high or too low, please maintain the proper tire pressure.

Basic knowledge of motorcycle tires? Understand the tire size specification mark

Describe the marking method of motorcycle tire specifications

The marking properties of motorcycle tire specifications are basically the same as those of automobile tires, but there are also some special marking attributes. First, let's first introduce the specifications of which parts of the tires.

The basic specification marks are:

1 tire outer diameter

2 total width of the tire (including the width of the tread [tread], the widest part of the tire)

3 tire height (length from the bead [bead] to the center of the tire)

Four sizes including 4 rim diameters.

According to these four basic data, the following specifications are displayed on the tire: (total width of the tire) / (flat ratio of the tire: ratio between the height of the tire and the total width) - rim diameter (example: please refer to Figure), these data are not marked to a fine 1mm unit, only a rough indication.

Examples of markings for general tire size specifications

This is an example of the marking of general tire size specifications. The width and mark of the number are mainly based on the purpose or the model. There are various values. The marking method is uniform and will not change from manufacturer to manufacturer.

At the mark, the manufacturer's name, brand name, etc. are usually marked on the side of the tire.

※ The part marked in gray is also important information to indicate the characteristics of the tire.

For the marking of motorcycle tires, the total width of the general tire is usually 10 mm, and the flat ratio is marked with 5%.

If the mark attribute is 190/55ZR17, this means that the total width of the tire is about 190 mm and the flatness ratio is 55%, so the height of the tire is 190 x 0.55 = 105 mm.

Therefore, the outer diameter of the tire is the height of the tires on both sides: 105mmx2 and the diameter of the wheel frame is 17 inches. Therefore, if the outer diameter is roughly calculated, it is (105mmx2) + 17 inches x 25.4mm ≒ 642mm. The correct size specifications must also be confirmed. Data provided by tire manufacturers (Bridgestone Bridgestone is documented in the product catalog).

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