Automobile tire is one of the important parts of automobile running. It is in direct contact with the ground, and together with the automobile suspension system, it can reduce the impact during driving and ensure the good comfort and smoothness of the automobile when driving. Made of a lot of rubber (divided into synthetic rubber and natural rubber, natural rubber has better performance. ), and embedded steel wire. Rubber determines the wear strength and comfort of the tire, while the inner steel wire makes the tire have stronger wax resistance and good fatigue resistance.
What do the numbers on the tires mean?
Usually our common tires are radial tires, and there are not only manufacturers but also a series of digital numbers on the side of the tires.
For example: 195/55R 15? 9 1W
195 indicates that the tire section width is 195mm, and every 10mm is a slope. Generally, the width of automobile tires is between 145mm and 235 mm. The bigger the data, the stronger the grip and the higher the fuel consumption.
55 is a ratio, specifically, the ratio of sidewall height to section width is 55%, the flatness ratio of ordinary cars is 45%-75%, and the flatness ratio of some high-end cars or sports cars is less than 50%.
R stands for radial tire structure, that is, radial tire.
15 is the matching hub of this tire, which is 15 inch.
9 1? Is the load-bearing coefficient of the tire, indicating the maximum load-bearing capacity of the tire.
W is the speed grade of the tire, which means that the maximum speed that the tire can adapt to is 270 km/h.
Tips for protecting tires.
1, don't start too hard to avoid tire idling and slipping on the ground. Some young people think this is a handsome start, especially the manual gear, which is not only handsome but also good in technology. By the way, starting like this can also judge the grip of the tire. Tires with good grip will obviously feel the feeling of the vehicle jumping and preparing for ejection when idling on the ground, while tires with poor grip will simply slip ... but try to avoid this beginning.
2. Check the tire pressure every once in a while (the domestic tire pressure is between 2.2 and 2.6 atmospheres, can you drive a large SUV and off-road vehicle ...) and the stones between the tire tracks should also be removed.
3. When parking, try to choose a flat road surface so that all four tires can land smoothly and completely.
4. When the vehicle is overloaded, the pressure on the tire will be greater, and the corner turning will be slower than usual, reducing the centrifugal force of the vehicle and reducing the lateral deformation of the tire.
Every six months or after tire repair, the tire will be out of round, that is, the center of gravity will change. When driving at this time, when the speed reaches 80- 100KM/H, the steering wheel will shake. At this time, dynamic balance should be done to return the center of gravity of the tire to the center point.
When should I change the tire? Don't listen to the repairman scare you, but have your own judgment. After all, tires are not cheap, and it is not easy for everyone to make some money. ......
1, the tire has been used for a long time, and there are a lot of cracks on the tread, which is seriously aging. A word of caution: tire wax used for car washing looks good, but it will corrode tires and accelerate tire aging.
2. The tire tread is smooth. The tread depth of the new tire is about 8- 10 mm. When the tread is less than 1.6mm, its grip will be greatly reduced, which will seriously affect the driving safety.
3. Abnormal or uneven tire wear is a quality problem.
4. The tire was bitten. Chewing on tires is a big problem, and many cars will appear. There are two specific situations. First, the tire pressure is too high, which makes the middle of the tire tread more worn. Second, the difference between the front and rear distances of the toe-in (two front wheels) is generally less than 5mm from the front end to the rear end. ) deviation, causing serious tread wear on one side. When this happens, please do four-wheel alignment as soon as possible.
5. The tire sidewall is bulging or damaged. The bulging is because the steel wire in the tire is broken, and it is very likely to burst when driving again, causing an accident. In addition, minor side injuries can be repaired by fire. Although it's obviously ugly, it's okay to drive in the city, but you can't get on the highway.
In fact, you don't have to choose the original brand or those big brands when changing tires, because it may not be suitable for the road conditions you usually drive. Personally, if you often drive at high speed, you can choose a soft tire with better mute effect. If you rarely run at high speed or low speed in urban areas all the year round, or often drive in bad road conditions, it is recommended to choose hard tires with more wear resistance. Finally, I want to say that the quality of domestic tires is not bad, the price is much cheaper and the cost performance is high. And in view of the recent US sanctions against Huawei, I think we should support domestic brands.