Although the current 4S shop is not easy to do, their scythes have always been sharpened quickly, and they have never been merciful. The last time meow brother friend's car, 4S shop let her spend 495 yuan to change a tire, after changing the tire, but also let the family do four-wheel positioning, meow brother a look at the tire has no partial grinding, the direction is not deviated, do four-wheel positioning is completely belongs to the people, bully people do not understand the car.
The 4S shop is thinking, since you changed the tires, simply put all the wheel-related projects for you, and finally basically changed, simply changed the car. So Brother Meow to tell you again, whether we have changed the tire, we must do four-wheel positioning. First of all, we need to understand what is four-wheel positioning, just like the relationship between the wheel and the ground, the normal is a shape of an outer figure eight.
But because in the process of driving, after the wheel has been long, it has a pull rod screw or loose inside, it will slowly become the inner figure eight, it is originally worn in the middle, so it becomes the outside of the grinding, that is, the shoes worn by some of our friends, like Meow Brother is a bit old grinding shoes heel, that is, the tire is grinded to one side and grinded away, the other side is still new, the inclination of the tire has changed, resulting in uneven force.
In the second case, the tire in front of it, its angle is flat and forward, but because it is loose a little, so this tire it can not run in a straight line, every time it drives high speed, running and running is off, running and running is off.
Then in this case, it is also due to the loosening of the lever on both sides, causing it to deviate from its originally set angle, in this case, it is necessary to do four-wheel positioning, but the four-wheel positioning adjustment is not four tires, but the tie rod next to the tire.
Now after changing the tires, that is, the shoes are changed, then the shoes themselves are broken, it is to change the shoes, the feet are not broken, and the key is that the shoes are worn, the shoes have not been partially worn, or normal wear, there is no need to go because the shoes are changed, to re-correct the feet.
So the car to change the tire, as long as not to deviate, as long as the tire is not biased, four-wheel positioning and change the tire has no half-cent relationship, there is no need to do it, it is yours, many places are doing so. Change the tire to let do four-wheel positioning, because four-wheel positioning it is a set of equipment, you can see the car after driving up, adjust the data.
This set of equipment 4S shop to buy are bought, put there is also put, for you to move, at least have to charge one or two hundred, 4S shop is a one-time investment in costs, follow-up on the continuous income, must be a earned. So that's why the 4S shop maintenance staff told Myo Brother friends to do four-wheel positioning, because the equipment itself is not cheap, and after buying, it always has to play the greatest value.
But after we change the tires, although we don't have to do four-wheel positioning, the dynamic balance is to be done, because the newly replaced tires, although the balance is adjusted at the factory, but in fact, when the tires are installed, the wheel hub is impossible to be 100% uniform. Therefore, after installation, if you do not do dynamic balance, it is easy to have abnormal tire shaking, and the dynamic balance is precisely for the tire.
You can see that after the tire is installed, and then put the whole tire, and the wheel on the dynamic balance machine, let it run in circles quickly, after running, which place is light, which place is heavy, it will show you out, and then put the light place, use the dynamic balance block to paste it, the counterweight is pasted on the small piece of 5 grams and 10 grams, after it is pasted, and then let it continue to run, let it data reach balance, and then load the tire to the car at this time.
Some friends will ask what is the advantage of doing this? In fact, after doing the dynamic balance, when the car is running at high speed, it will run at high speed, then it will not appear after running up, and there will be a situation of shaking.
Because if you do not do the dynamic balance, there are some places on the tire that are heavy, and after the high-speed tire is quickly turned up, it will appear to shake, such as: playing the fidget gyroscope, taking the fidget gyro to the hand to turn, turning it up very smoothly, but a certain part of the fidget gyroscope, attaching a tape, and then turning up, will feel that the fingertips are not stable at all, is exactly the same reason.
The above is after we change the tire, why don't be fooled, to do four-wheel positioning, as long as you do the dynamic balance can be, and the dynamic balance is generally, bought the installation service of the tire change, it contains the dynamic balance service, and the dynamic balance it is also very cheap, fifty or sixty dollars to do it, there is no need for one or two hundred four-wheel positioning costs.