- 1). Insert a tire pressure gauge into the tire's valve stem (the nozzle on the side of the tire) to check for PSI (tire pressure). Press the gauge down until you don't hear a hiss of air. Note the reading on the gauge. Look for a sticker on the driver's side door that lets you know the maximum tire pressure (PSI). Add or subtract air to your tires as needed.
- 2). Verify the tread hasn't worn down. Take a penny and insert it into the tire groove with Lincoln's head upside-down. If you see all of Lincoln's head, the tire needs replacing. You can also look for the tire wear bars actually in the tires. When you can see these bars, the tire needs replacing.
- 3). Look at the tires for nails, damage or cracking. Repair or replace the tires as needed.
- 4). Inspect the tires for wear in odd places. Wear in the middle or on the edges may indicate that the tire is overinflated or not inflated enough. If the edges look erratic or feathered, the tires may be misaligned. If you notice wear in the same spots on all the tires, have them rotated.
- 5). Buy the right size replacement tires. Choose from P195/60R15, P205/50R16, 215/45R17, P185/65R14, depending on the year of your car.
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