Tire Test

• A whining sound or vibration while driving may mean tire problems. To differentiate tire noise from other automobile sounds, try to find a smooth road and drive at varying speeds. Brake lightly when it is safe to do so. Although other noises change during this test, tire noises stay constant. If you suspect one or more tires are worn, attend to this problem without delay.
  
  

Tire Inflation

• Under-inflated tires will tend to wear on the outer edges, as the tire lifts in the middle. Over-inflated tires wear more in the center because the outside edges are lifted from the ground. Tires with the right air pressure will wear evenly, according to Tire-Information-World.com.
  
  

Tire Wear

• Scalloped edges on the tires may indicate worn suspension components; wheel alignment cannot cure this problem. If this is the case, have the worn parts replaced. After the repairs are made, have your car repair technician rotate tires or replace them if excessive wear is indicated. Tire pressure should be checked frequently to prevent uneven wear that shortens tire life, according to AutomotiveCorner.com.