There is a very simple way to see if your tires are running out of tread life and it will only cost you a penny. The Lincoln test, or penny test, is one of the easiest tests you can do yourself on your car.
In the United States, tread depth is measured by 1/32 inches. The U.S. Department of Transportation recommends replacing your tires when the tread depth reaches 2/32 inches, or a 16th of an inch, which happens to be the distance between the top of Lincoln’s head and the edge of a penny.
To do this test, take a penny a place it upside down in the grooves of your tire’s tread. You want Lincoln’s head facing downward.
If the top of Lincoln’s head is covered by the tread, then you should be good to go. However, if you can see all of Lincoln’s hair, we recommend you get some new tires.
When doing the penny test on your tires, make sure to not only check every tire, but various spots on each tire, as tread does not always wear down evenly. Even if some spots measure deeper than a 16th of an inch, if any part fails the test, it’s time to replace the whole tire.
Just remember, Lincoln is your friend- whether that means checking your tires' safety or buying your next car.
More pictures of tires, some of them from a Lincoln, to make this page look even cooler.
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