When to replace your tires

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.

6. You hear a whining, near whistling, sound when you drive. The whistling is produced by too much of the tire surface improperly touching the pavement. The exterior of the side wall is touching the pavement. Unusually worn side walls can blow out at high speeds (over 40 mph).

7. Your tire has become flat, and you have driven on it for more than one half mile. The inside wall of the tire will be damaged, as well as the exterior of the side wall. The tire will be unsafe to operate the vehicle.

8. You notice wear, nicks or cuts on the side wall of your tire. There is no reinforcement in or for the side wall. If it is damaged in any way, the tire should be replaced.

9. You notice uneven tread wear. If the inside or outside tread of your tire is worn more than the rest, it is best to replace it, but consult a professional. If the worn tread is less than 7/32 of an inch deep, definitely replace it.

Remember, tires are the only thing keeping you on the road. Take care of them.

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