(1) Technical standards. Firstly, we can refer to the wear indication marks on tread, that is, the bumps in the tread grooves, which generally have 6 to 8 strips with a width of 12.5mm. The tire side walls located at the corresponding parts are marked with "S", "_" or "TW1". When the tire wears to the level of the marker and the table, it shows that the groove depth is less than 1.6 mm, which means that the tire wears to the limit, and the tire should be replaced.
(2) Wheel tyres can be determined by mileage in combination with road conditions. Tyres generally travel 30,000 to 50,000 kilometers and need to be replaced. The asphalt pavement is 50,000 kilometers flat and the sandstone rugged road is 30,000 kilometers. When the above-mentioned kilometers are exceeded, the friction coefficient of tread will decrease. When wet and slippery pavement encounters rain and snow, the decline of tread pattern extrusion and drainage function will easily lead to slippage, while in Sandy and stone pavement, tires are easy to explode.
(3) Time standard. Rubber will aging naturally due to the influence of environment. Even if the tire is not worn out and the driving mileage is small, the soft tire should be replaced for 8 years and the hard tire for 5 years. There are signs of tire aging, so it can be found in time if you drive more carefully.