Tires are the first line of defense for a driver and greatly affect fuel economy. Each of these indicators will let you know when to replace your tires.

1. Less than 7/32 of an inch of tread is left on the tire. Place a penny in the tread. The tread should reach past Lincoln's eyebrow.

2. You have exceeded the number of miles on the tire rating. Tires are rated to travel a finite number of miles as a maximum. Replace tires within 1,000 miles of the maximum rated mileage.

3. You can hear a rhythmic thump as you drive. This is often produced by a tire that is out of round, simply, has a hernia. The steel belting has been severed inside the tire, and the inner layer of rubber is placing pressure on the tread from the inside.

4. You develop a slow leak. If your tire pressure is low within a week of filling it to the correct pressure, you should have the tire checked. Punctures within 1 inch (25 mm) of the edge or in the side wall should never be repaired, as they can cause tire exposion during a blowout.

5. You develop a leak after placing a fixative tire inflater into your tire. If you tire is not at the correct pressure within one week of using a product, such as Fix-a-Flat or Re-Air, replace the tire because it is unable to be patched. The chemicals in the fixative keep the patch material from bonding properly to fix the tire.

Note: Americans will pay a fine for this tire, as after the fixative, it cannot be recycled by traditional methods.

5. You notice a wobbling in your steering. This is another sign that you may have a tire that is out of round.

Read the rest of the warning signs!

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