Trucks usually use vacuum tires. It's normal to feel a little flat under the action of vehicle weight. When we are sure that the tire pressure is OK, even if it looks a little flat, it is normal.
In order to ensure the effectiveness of tread patterns, countries all over the world have formulated clear regulations on the wear limit of the tire tread pattern. The tire wear limit warning marks "△" and "TWI" in English are engraved at several equal parts along the circumference of the tire shoulder.
When the tires are worn to the alarm mark, the large truck tires should be replaced with better ones. Therefore, we should pay attention not to wait for the pattern to be polished before replacing it.
The automobile tire is a rubber tyre. The service life of rubber varies according to the service environment, usually 3 ~ 5 years.
If your car is parked on the side of the road every day, exposed to the sun and rain, even if you don't drive it often, the mining truck tyres may be used for about three years.
If you park your car in the underground garage every day and don't drive it often, tires may be used for 6 ~ 7 years, but you should pay special attention at this time and often check the aging condition of the tires. After all, the rubber tyres that have been used for more than 5 years are ageing ones.