Things You'll Need:
- Tire pressure gauge
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Step 1
Look at the tires for damage, cracking, bulges or nails and other objects embedded in the tires. These can cause a flat tire at the worst possible moment.
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Step 2
Check the tires for uneven wear. Uneven wear on the edges of the tires indicates under inflation, while wear in the middle of the tires indicates over inflation. If you notice feathering or odd uneven wear along the edges the tires may need replacement and realignment. If you notice wear in the exact same spot on all the tires, the tires probably need rotating.
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Step 3
Insert a tire pressure gauge into the tire's valve stem (the nozzle on the side of the tire) to check the air pressure (PSI) of the tires. Press the gauge down until you don't hear a hiss of air. Note the reading. Check the sticker on the driver's side door to find out what the maximum PSI should be. Add or subtract air to your tires if your PSI indicates it. Once you add or subtract air from tires, don't forget to double check the PSI again.
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Step 4
Examine the tread of the tires. Check for tire wear bars—bars in the tires across the treads. If you see these, the tread has worn down and tire needs replacing. You can also inspect tread by taking a penny and inserting it into the tire groove with Lincoln's head upside-down. If you see all of Lincoln's head, the tire's too worn and needs replacing.
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Step 5
Make sure you replace any tires (if the tires need replacing) with the correct size tires onto your Geo Metro. If you're not sure what size tires to purchase, check out the Goodyear Tires site (see Resources) or look in your owner's manual.
