There are actually many aspects to the function of tires. There are 10 main areas: dry grip, waterproof and slippery, provide comfort, reduce driving noise, impact resistance, wet grip, bearing capacity, handling ability, average wear, and mileage. The evaluation of tire performance is mainly from these aspects.
The cross-sectional structure of the tire can be roughly divided into 4 parts: tread, shoulder, bead and bead. Each part has its own function. The tread is mainly in contact with the ground, the shoulder and the rim play a supporting role, and the bead and rim contact play a sealing role.
The tire is not just a ball of rubber, the inside of the tire is actually composed of multiple layers of different materials superimposed-tread pattern, cover layer, steel belt layer (2 layers), stress absorbing rubber strip, carcass cord layer, air Dense layer. First of all, let ’s talk about the “steel belt layer”. This layer is formed by stacking two steel layers. The steel wires of the two steel layers form a certain angle. The function is to improve the rigidity of the tread and make the tire cope with uneven road impact. In order to prevent the corrosion of the steel wire, there will be a "covering layer" outside the steel wire layer. The "carcass ply" runs through the entire tire cross-section to provide support for the tire. The “air-tight layer” is located inside the tire and extends to the bead of the tire, mainly serving as a seal.
The smaller the aspect ratio, the thinner the tire looks. Small aspect ratio tires are the trend, the reason is to adapt to the high output torque needs of new models of cars.
For general users, we only need to care about the size parameters of the tire. For example 225/40 R17 94Y, 225/40 is the aspect ratio, R is the radial tire, 17 is the outer diameter of the rim, 94 is the load index, and Y is the speed grade. The specific values of the load index and speed grade can be obtained from the related tables.
2 Tire maintenance
The average user may do regular maintenance on the car, but he knows little about the maintenance of the tires and the normal method of use. We need to check the air pressure of the tires on a regular basis. Leakage of nails and air nozzles will cause a rapid decrease in tire air pressure. Hidden dangers can be found in time by checking the air pressure. The standard tire pressure value can be found on the door label or user manual. Many brand tire dealers provide free tire pressure inspection services. You can check the tire pressure at your own brand dealer or use a small tire pressure gauge for self-checking.
Sunlight or organic solvents will accelerate the aging of tires. Car owners should avoid the use of organic beauty products such as tire brighteners, and park the car in a cool place as much as possible.
The China international wheel show reminds you: due to different driving habits, driving conditions and different driving methods of different models, regular tire adjustments will help extend the life of the tires. For tires with the same specifications and symmetrical or asymmetrical patterns, we use diagonal wheels to replace the tires when adjusting the tires; for directional tires, we use the same front and rear wheels to adjust the tires.
Tires are consumables and need to be replaced every ten of thousands of kilometers. So when do you need to change your tires? In fact, we can refer to the tire wear mark in the middle of the main drain groove of the tire. When the tire tread is worn to the level of the wear mark, the tire needs to be replaced. It can be seen that when the tire reaches the wear limit, the wet grip area is already very low, which seriously affects the safety of wet driving. Therefore, the tire must not be worn to the "bald head" and then replaced.
Of course, we are not suggesting that you grind your tires like this, only that the correct four-wheel positioning parameters can make the tire tread wear evenly. Therefore, when it is found that the tire is unevenly worn, it is necessary to check the four-wheel positioning parameters of the vehicle.
Good driving habits can ensure that the tires are not damaged. If you must pass through obstacles such as pits or protrusions, please slow down as much as possible. Please drive the car on the roadbed as far as possible, and the roadbed from the side may damage the carcass layer. If the carcass ply is damaged, the most common situation is tiring bulging. If the bulging area is squeezed again, it is likely to burst and affect the driving safety of the vehicle.
3 Misuses of tires
Many people think that the grip of wide tires is greater, but it is not. Under certain circumstances, the narrow tire will have a larger grip area than the wide tire, and the narrow tire will have a stronger grip. Experts do not recommend general users to upgrade or modify the model or size of the original car tires unless you are a professional modification enthusiast.
Many users feel that if the front wheels are used as steering wheels if only two tires are replaced, new tires should be installed on the front wheels. In fact, this is a misunderstanding, and many people do not know it. If only 2 tires are replaced, we should install new tires on the rear wheels. why? The china international tire trade fair reminds you: whether it is a front-wheel drive, rear-wheel drive or four-wheel drive model, if the rear wheel loses grip when turning, it will oversteer and the front wheel will lose grip There will be understeer. The traditional driving theory believes that understeer is safer than oversteer, and the trend of understeer can be corrected by playing a little more direction. Therefore, everyone should pay attention to this point when changing tires in the future.
Typing too much when inflating the tire will cause the tire tread to bulge, which will cause excessive wear on the middle area of the tire for a long time. Therefore, when inflating, please refer to the standard tire pressure in the vehicle manual. On the contrary, running tirelessly in the tire factory will cause excessive wear near the inner and outer shoulders of the tire.