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Photo: Pixinoo (Shutterstock) If you own a car, you also own at least four tires—five if you’ve got an actual full-size spare in the trunk instead of one of those humiliating donuts. At every level from single-car owner to tire yard proprietor, there are many tires to be owned. The point is, most of us do. Still, very few of us understand how to replace those tires on our own, even though it isn’t as complicated as you might think. In fact, all the information you need is literally printed on the tires you already own. Naturally, that information isn’t printed in what might be called a “human readable” manner—it’s a code. But once you understand what the code means (and master a little simple math), you’ll be able to figure out what kind of tire any vehicle needs all on your own. This is especially crucial if you’re only replacing one tire, because even tiny differences in specs can have pretty disastrous results on your car’s health. Here’s how to read your car’s tires. Tire literacy You may have noticed that the tires on your car all have a lot of writing on their sidewall—inscrutable numbers and letters. Joke’s on you: all these letters and numbers are totally scrutable. You just need to know what they mean. There are two codes you’ll need to pay attention to. First, look at the he sidewall code and second, check out the DOT (Department of Transportation) code. Let’s take two made-up […]