It’ll most likely be the letter “R”, which stands for radial. Constructionįollowing the aspect ratio number, you’ll find a letter that signifies the type of internal construction maintaining your tire’s stability. Additionally, an aspect ratio of 50 or lower means the tire has a short sidewall, offering improved steering response and better overall handling. The bigger the aspect ratio, the larger the tire’s sidewall. For example, a P215/65R15 tire has an aspect ratio of 65, meaning its sidewall height is 65% of its width. What the heck does that mean? It’s the tire’s ratio of sidewall height to width. Aspect RatioĪfter the width number, there’s a slash mark followed by a two-digit number indicating the tire’s aspect ratio. So, the bigger the number, the wider the tire. For example, a P215/65R15 tire number means the width is 215 millimeters. Widthįollowing the letter in the code, you should see a three-digit number, identifying the tire's width in millimeters from side wall to side wall. Euro-Metric and P-Metric tires are designed for passenger vehicles but may have different load capacities. Not seeing any letters? You might have a Euro-Metric tire. The “LT '' indicates that it’s a light truck tire for vehicles capable of carrying heavy loads and navigating rough terrain - i.e., heavy-duty trucks, SUVs, and vans. Vehicle TypeĪt the beginning of the tire code, there will usually be the letter “P” or “LT.” The “P” tells you that it’s a P-Metric tire designed for “P”assenger vehicles such as sedans, SUVs, minivans, and light-duty pickup trucks. Let’s help you crack this tire number code by reviewing each section. How to Read Tire SizeĪside from the tire’s brand name and model, the sidewall of your tire tells you a lot about its size and characteristics. Fear not! We’re here to help you decode these tire ratings so you can learn how to read a tire. The problem is that tire size is shown through a code of numbers and letters like P215/65R15 95H. So how do you know what tire size is right for your vehicle? You can refer to the owner's manual or look inside the front, driver's door jamb for information. The way to be sure your tires are the right fit is to ask your local Les Schwab pro.Just as wearing the right-sized shoes is crucial for walking comfortably, ensuring your vehicle has the correct tire size is essential for optimal performance. These calculations (and those provided by all online tire dimension calculators) don’t account for these variations. A tire’s true physical size can vary from the dimensions provided by the tire manufacturer, and this tool does not take into account other important application factors like load index and speed rating. We don’t recommend that you base sizing or purchase decisions on the calculator alone. Our tire size calculator is for general comparison purposes only. It will also tell you the difference in tire speed between your comparison tires.Īs a general rule, you want replacement tires that are within 3 percent of the diameter (height) measurement of your existing tires’ diameter - assuming your current tires are what your owner’s manual recommends. Our tire size calculator converts metric measurements to inches so you can easily compare the diameter, width, sidewall, circumference and revolutions per mile.
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