The high temperature in summer increases the risk of tire puncture a lot, and a large number of riders will pay more attention to tire safety in this season and are more willing to replace tires with potential safety hazards.
At this time, some car owners may ask: does the vehicle have to do wheel alignment after replacing four new tires?
The answer is, not necessarily. Because there is no necessary connection between changing new tires and doing four-wheel alignment! Being able to ask this question shows that the owner does not know what four-wheel alignment is.
The main "fixed" of the four-wheel alignment is the data of the chassis, that is, the suspension data of the four tires is connected, if the suspension data of the four wheels is not a problem, the four new tires do not need to do the four-wheel alignment. Of course, some tire shop owners will say to car owners: change four new tires and carry out four-wheel alignment for free.
This makes many car owners excited, after changing the new tires, watching the boss drive the car to the four-wheel alignment, install the equipment, look at the data, and operate under the car with a wrench. In fact, this is a marketing tool, and it is also a psychological hint to car owners. In many cases, if the car does not exhibit problems, the chassis does not need to do wheel alignment at all.
So, under what circumstances do you need to do four-wheel alignment for new tires?
I'll give you a real case, look at the picture below, this is the rear wheel of a Honda CR-V, we look at the tread of the tire, the wear is uneven, the gap is very obvious, this is the tire eccentric wear.
The left side of the tread is worn to the limit (typical of tire eccentric wear)
The cause of tire eccentricity is that there is a problem with the suspension data connected to the tire. In this case, after changing the new tires, it is necessary to carry out four-wheel alignment, otherwise, the new tires will also be eccentric.
What other situations do you need to do wheel alignment? According to the maintenance master, when the vehicle has problems such as driving deviation, improper steering wheel, steering wheel will not automatically return after steering, suspension maintenance, etc., the vehicle must be aligned with four wheels.
Four-wheel alignment displays data
The above is some common sense in the four-wheel alignment of the car, some riders may still not be able to distinguish the difference between tire dynamic balance and four-wheel alignment, and then we will talk about the common sense of tire dynamic balance.
Tire dynamic balancing is the data after the tire and rim are combined, as long as the tire is separated from the rim and then installed, the tire dynamic balancing must be done. Otherwise, the wheels will jump when they rotate at high speeds, and the steering wheel will shake in the car.
Tire dynamic balancing machine
The operation method of tire dynamic balancing is to fix the wheel on the dynamic balancing machine, set the wheel data, let the machine drive the tire to run at high speed, and the dynamic balance data will be displayed on the instrument, and then according to the displayed data, paste the corresponding weight of the balance block in the designated position of the inner ring and the outer ring of the wheel, and then let the machine drive the tire to rotate until the data shows normal.
Adhesive balance weight on the inside of the rim
Cassette balance on the outside of the rim
Finally, let's go back to the original question, after the car is replaced with new tires, what must be done is the dynamic balance of the tires, not necessarily the four-wheel alignment, to see whether the old tires are worn abnormally, whether the driving deviation, whether the steering wheel will automatically return, whether the chassis has been repaired, etc.