![]() Over inflation can cause premature tread wear in the center of the tire while under inflation leads to increased wear on the shoulders of the tread pattern as well as decreased handling ability and fuel efficiency. It’s also important to note that over inflating or under inflating your tires can have consequences beyond just an uncomfortable ride. Give them a couple hours to cool down before checking and adjusting if necessary. It’s important not to check your pressure immediately after driving because those numbers will be higher than they actually are due to the heat build-up from driving. Cold meaning that they haven’t been driven yet that day so they haven’t had a chance to heat up and expand from friction. But as a general guideline, most passenger vehicles will have ideal pressures between 30-35psi in the front tires and 35-40psi in the rear tires when they are cold. The short answer is that you should always consult your owner’s manual first and foremost. Now that we know how to read those numbers, what do they mean for tire pressure? This means that your tire has a width of 205mm, a height of 55% of the width, and will fit on a 16” diameter wheel. ![]() The last number is the diameter of your wheel in inches.įor example, a common size for passenger vehicles would be 205/55R16. The second number is the height, or aspect ratio, of your tire wall. The first number you see is the width of your tire in millimeters. Here is a quick guide to help clear things up! One of the most common questions we get here at the shop is “What should my tire pressure be?” We understand it can be confusing with all the different numbers on the sidewall of your tires. This unit is often used to measure the pressure of fluids and gases.įor example, if you were to take a balloon and fill it with air, the psi would be the amount of pressure that the air is exerting on the walls of the balloon. In other words, it is a unit of measure that indicates the amount of force that is being exerted on a given area. ![]() ![]() The term “psi” stands for pounds per square inch. ![]()
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