Tires are the only part of the car that has direct contact with the road. They affect your vehicle handling, ride, braking and safety. For optimum performance, your vehicle must have the correct wheel alignment and your tires must have the correct air pressure, tread depth, and balance.
Checking your tires on a regular basis is an important step in protecting your safety and your automotive investment. Tire inspections should be performed monthly, at a minimum. If you drive over potholes and debris in the road, live in a cold climate, or drive long distances regularly, then you should inspect your tires more often. Always inspect your tires before a long trip. The more often these inspections are performed, the easier it will be to find a small problem, such as a nail in your tire, and fix it before it becomes a more expensive and time-consuming problem.
However, properly trained and equipped service personnel should perform some tire maintenance, including puncture repairs, tire replacement (mounting on the rim), tire rotation and balancing, and wheel alignment.