When the tread loss approaches the wear mark, any brand of tire will set a wear mark at the bottom of the tread groove. As long as the height of the tire block is lower than this mark, or if the mark is no longer visible, it is necessary to change the tire.

The height of the wear mark on general sedan tires is 1.6 millimeters (which is also the legal minimum groove depth for tires), and the height of the wear mark on heavy-duty tires is 2.4 millimeters. Don't wait until the tire pattern is almost worn out before changing the tire, otherwise if you encounter a slippery road surface, the tire will not be able to drain water quickly, which can easily cause the vehicle to slip and lose control.

It is best to change the tires of a car to the same brand. Generally, four tires of the same brand and specification can ensure the best performance of the vehicle. If the tires are different, it may have a certain impact on handling and stability.

However, in general, the front tire is more severely worn than the rear tire, so it is not cost-effective to replace all four tires together. Generally, it is necessary to replace two tires on the same axle. If four tires need to be replaced together, it is necessary to switch the front and rear tires to each other halfway through their service life.