1. Fully rotate each wheel. Use a small screwdriver to remove stones and other foreign bodies from the grooves of the tread. If a piece of glass or a nail sits in the tire, then air can escape in this place.
2. Pay attention to such problems as punctures, cuts, cracks and torn pieces. If the rubber is damaged, moisture will penetrate into the tire. However, from the outside, you may not notice that the stabilizing steel breaker is already corroded by rust. To be sure, ask a specialist to check the tire. The same should be done in case of severe tire wear.
3. The height of the tread pattern over its entire area must be at least 1.6 mm. The tire shown in the picture shows wear indicators in several places on the tread. These places are marked on the sidewall of the tire with the letters «twi». As the tread pattern wears out, the driving performance of tires deteriorates, especially on wet roads. To be sure, summer tires should be changed already at a tread height of two millimeters, and winter tires at a tread height of four millimeters.
4. Check if all tires are evenly worn.
The minimum tread depth is achieved when the wear indicators placed around the circumference of the tire are 1.6 mm high (arrows) indicate that the tread profile is worn
5. Carefully inspect the sidewalls of the tires. Bulges indicate damage to the tire carcass.
What does the tread surface say?
The carcass tear is visible from the inside of the tire
Worn outside tread (front tire). Fast cornering. Tires can be changed to tires from the rear wheels.
The outer sides of the tread are worn more than the middle. The tire has been under pressure for a long time.
Uniform smoothing of the tread pattern The shock absorber is probably faulty.
Uneven wear (in different places). Wheel imbalance. Contact the workshop.
Strong wear in one place. Braking with a locked wheel. Momentary blocking and certain tire wear (flattening) not even the anti-lock system can prevent.
Brake marks with a blocked wheel: with an anti-lock system, this picture is not possible
Strong wear of the middle part of the tread pattern. It occurs due to frequent driving at maximum speed. Under the action of centrifugal force, the tires bulge, so they wear more in the middle. This effect is most pronounced on the rear wheels, as well as when the tire pressure is too high.
Strong wear of the middle part of the tread
Curved profile. An oblique profile indicates incorrect wheel alignment. Wheel alignment can also be adversely affected by light alloy wheels.
Curved profile
The imbalance of the wheel manifests itself in the form of vibrations of the steering wheel or front end. The reason is the uneven distribution of mass within the wheel, which also causes increased tire wear. The unbalance must be corrected in the workshop. In the workshop, the wheel is screwed to a balancing machine, which shows unbalance. Rough rotation of the wheel is eliminated with the help of lead weights, which are installed in different places on the rims.
Static imbalance A occurs even when the wheel is spun while the vehicle is raised and then allowed to stop. The center of gravity will be at the bottom. A wheel with a static imbalance during the ride jumps, the shock absorbers wear out faster.
Static imbalance B appears only when the wheel is spinning fast. The outweighing place is not located in the middle plane of the wheel, but is offset to the outside or inside. As a result, when driving fast, the wheel makes angular oscillations and staggers.
Wheel imbalance
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