Here is the not-so-secret: take a penny and hold it upside down in the tread so that Lincoln's head is pointing down. This method isn't as accurate because it can't produce an actual number for tread depth, but it does effectively tell you if you have a problem. While tread depth gauges aren't exactly expensive, pennies are just one cent. You would also be wise to measure tread depth in more than one area, especially if your vehicle's tire looks like it has cupping, uneven wear, or is driving out of alignment.
The ruler printed on the side will give you a great indicator of how many millimeters or tens of an inch you have left. Put the gauge into the tread and see how deep it goes. These are also often attached to a tire pressure gauge so you can measure your tire's PSI while you measure depth. Tread depth gauges are very simple devices, often with a white stick that acts as a small ruler.
Tread depth gauges are the most accurate way to measure a tire without going to an auto shop. We'll go over a few of the more accurate efforts. There are many ways to test tire tread depth. Speaking in fractions, that's a big difference and often there to support a larger vehicle like a truck. You can anywhere from ¼ of an inch of rubber on the outside all the way up to just over a half inch. If you wanted to know, the sidewall also has a specific thickness, though it does vary greatly based on the model of tire. These include snow tires, especially, which are commonly driven in extreme conditions. With additional weight on them and the need for more torque, some truck tires can start with more tread thickness and a more aggressive tread. Most standard all-season tires start with up to 11/32 of an inch thickness.
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