Someone says that the tire could be used up to 40,000 kilometers or 2-3 years but the other say that it could be more than that. But the truth is that you cannot predict it, it depends on the kind of work which are different so you must check it by yourself. The easiest way is check how deep is the groove. Every tire has the tire indicators which is 1.6 millimeters high. If the tread worn to the same level of the indicators, you must change the tire immediately.
As mentioned that sometimes you cannot measure by how deep is the groove but have to check the strength of the tread also. The easiest way to check is pinching the tread. If the tread is too hard to pinch, you have to change the tire immediately because, the tire doesn’t have the capability to grip anymore. If you try to drive your car with it, there will be 50:50 chance that your car is going to spin around when you steering on the wet road, it’s too risky. Don’t forget that there is only one thing that touch the road, the tire. So you must take good care of it. Another thing that you should take care of is the tread.
You also have to use your feeling when driving the car. If the steering wheel is shaking, it might be that the tread was not uniform wear. If it just started, swapping the tire could help but if you used it for a long time, you have to change the tire and don’t forget to find out why the tire was not uniform wear. Mostly it happened to the low loading car because the camber’s degree was unusual. The inner side of the tire is going to wear faster than the outer side. If you don’t change the new set of tire, this problem would happen again.
Aside from the tread, you have to check the sidewalls also. If it got lumps or shred, don’t risk using it. But if it were necessary, don’t drive in high speed and try to change the tire immediately.
Reference : http://www.siamsport.co.th/auto/other/view/57820
