Optimum lifetime avtoreziny - 40-50 thousand km.
When sparing operation, ie without slipping and blocking the wheels, at a moderate speed on the turns can increase mileage by almost half. Conversely, when "sport" style drive avtorezina can wear out and after 20-30 thousand miles.
The minimum allowable height of the tread - 1,6 mm. Measure it is not necessary - just look at the tire in the places indicated with arrows on the sidewall. If it is worn down to the indicators (the transverse ridges in its grooves), avtorezinu time to change. Many manufacturers of winter tires insist on a replacement, if the height of the tread has decreased to 4 mm - or the effectiveness of this alloy decreases significantly.
Studded tires, having lost more than half of their spines, too, time to go to bed.
However, if the grip you are satisfied and the imbalance does not exceed the standards driving on health.
Uneven tread wear avtoreziny can be caused by a violation of the angles of the wheels, faulty steering or suspension (including shock), increased wheel imbalance. If time does not solve the problem, avtorezina may be a very short time scuff up cords, the same fate befall the new tires. So do not delay the repair.
Vibration in motion, and bald spots on the tread - the consequences of braking with locked wheels. Possibly played a role, and "beating" brake discs or drums. Anyway, every time intensive braking avtorezina more often be blocked, increasingly will be bald spots. This wheel should be replaced. You can carry it as a "chute".
Small cracks on the sidewalls - no reason to replace it. They usually appear after a few years and are associated with natural aging avtoreziny. But the cuts sides - is serious business. If they are deep and may offend or bare wire cord, immediately change the tires, it could explode at any moment. Pose the same danger and "hernia" - local swelling sides. They mean that one or more cords torn - usually due to shock or pinch a tire upon arrival at the curb. Danger fraught with injuries that are on the side of the sidewall that faces the center of the car - it is not visible from the outside. Therefore, regularly (once or twice a year) inspect it. And in any case, do not neglect it under the permutation wheels.
