What Do Tire Numbers Mean?

Whether you’re looking to buy new tires or simply want to understand the numbers on your tires, you may have been confused by the alphanumeric code on the sidewall. This code represents the tire’s size, type, and the specific performance purpose it provides during your Stephenville trips. We’ve compiled a straightforward guide to answer, “What do tire numbers mean?” Read on and contact our parts center at Bayer Auto Group to find the right tires for your Cadillac, Buick, Chevrolet, Chrysler, Ford, GMC, Dodge, Jeep, Ram.

Understanding Tire Number Meaning

When you’re looking for your tire size, you’ll see a code similar to this on the sidewall: P215/65R15 95H. As you go to search for new tires to revitalize your Brownwood performance, this code tells the parts center the size, load index, speed rating, and type of tire your vehicle needs to optimize your driving experience. So, let’s break down what the numbers on your tires means:

Decoding “P”

The “P” stands for “P-Metric tire,” meaning that it is used for passenger vehicles. Tires found on light-weight pickup trucks will have an “LT,” which stands for “light truck.”. Tires that don’t have a letter code mean they are a European style tire, or Euro-Metric tire, with different load capacities.

Decoding “215”

The set of numbers following the initial letter code indicated the tire width in millimeters. In this case, the “215” number means the tire measures 215 millimeters from sidewall to sidewall. 

Decoding “65”

Following the forward slash is the aspect ratio code. Aspect ratio is the height of the tire’s cross-section to its width. That means a tire with a ratio of “65” indicates that the height is equal to 65% of the tire’s width. The bigger the aspect ratio, the bigger the sidewalls will be.

Decoding “R”

The “R” stands for radial, which is the tire’s construction type. You can also find tires with a “B” for belted bias and “D” for diagonal bias construction.

Decoding “15”

To understand what tire can fit on this particular wheel, you’ll want to pay attention to the “15.” That means the tire is meant for a 15-inch wheel in this particular example. 

Decoding “95H”

The final portion of the tire number meaning relates to the load index and speed rating for the tire. The “95” of “95H” is the load index that indicates how much weight the tire can support when it is properly inflated during Brownwood commutes. This number ranges from 75-105 for passenger vehicles.

The “H” stands for the speed rating, which indicates how fast the tire can safely go based on its load capacity. You’ll find speed ranking letters from A to Z, however, our example, “H,” means it can reach a maximum speed of 130 mph.

Tire Maintenance Tips: Check Tire Pressure

Now that you know what tire numbers mean, learning how to check tire pressure is a simple way to maintain the longevity of your tires. Nowadays, new vehicles are equipped with a Tire Pressure Monitoring System (TPMS) that warns you when the tire is over-inflated or under-inflated. Properly inflated tires can help them wear evenly as well as prolong their life and improve your fuel economy on Comanche streets.

Learn More About Tires with Bayer Auto Group!

Understanding what the numbers on tires means can help you find the right tire when you need a quick replacement or you’re considering making a change to improve your performance. Once you’ve found the right tire and read about how to change a tire, you’re ready to get back to smooth trips around Abilene. Learn more about tire basics and contact the Bayer Auto Group parts center if you have questions.