1. When the tire is worn to the wear indicator, you must not continue to drive and the tire must be replaced.
2. When the tire cord is broken, the bulge or the tire steel wire and cord are exposed, it must be stopped immediately.
3. When the tires have been used for too long (more than three years), they must not be used.
4. The tires are changed after half a year or every 5000 kilometers.