They have better road grip, lower rolling resistance for better gas mileage, ride comfort and durability than previous generations of tires. In a radial tire, the plies — layers of strong cords made of a blend of polyester, steel and fabric and coated with rubber — are laid perpendicular to the direction of travel. D is for tires built with diagonal crisscrossed plies, called bias-constructed tires. They are also called conventional, x-ply, or cross-ply tires. Some motorcycle and trailer tires still use this internal construction.
Some run-flat tires are identified with an F followed by the type of internal construction. The load index symbol indicates how much weight a tire can support, based on the following standard chart. A tire with a higher speed rating can handle heat better and provide more control at faster speeds.
The maximum operating speed of a vehicle is no more than the lowest speed rating of all tires mounted on the vehicle. For example, a "P" designation means that it is a passenger car tire. An "LT" designation is for a light truck. No letter before the width indicates that it is a European metric tire.
Tire Width. The width of the tire measured in mm from sidewall to sidewall. This tire width is mm. Aspect Ratio. The aspect ratio is the ratio of the height of the tire's cross-section to its width.
The construction letter tells you how the layers of the tire were put together. Rim Diameter. The rim diameter is the width in inches or cm of the wheel from one end to the other.
The diameter of this wheel is 16 in. Always replace a tire on a rim with another tire of exactly the same rim diameter designation and suffix letters. Load Index. The load index is an assigned number that corresponds with the load-carrying capacity of a tire. Most passenger car tire load indexes range from 75 to , but a few carry more. You'll also find the maximum load elsewhere on the tire sidewall, both in lbs. Learn more about tire load index.
Speed Rating. The speed rating tells you the maximum service speed for a tire. A speed rating isn't, however, a recommendation to exceed speed limits, and doesn't indicate how well a tire handles or corners. Learn more about tire speed rating.
Tire Sidewall Options Not all sidewalls are built the same. Black A black sidewall with black lettering. Whitewall White bands on the sidewall vary in width. Outlined Letters Letters on the sidewall are outlined in white. How to Buy Tires Online. Tire Size Calculator. Use the Goodyear Tire Finder, our tire size calculator, to help you find the right tire. Tire Size Chart. Use the tire size chart to find your tire size and see a tire selection that's right for you. Signup form component footer title.
Email Address. Thank you for signing up. You'll now receive special savings and expert tire tips. How would you like to search? However, the number does correspond to a specific load capacity listed in an index. Beginning with 1 and ending with , numbers in the load index represent carrying capacities of 99 to lbs. There are two types of load types for passenger tires though, Standard Load and Extra Load. If a tire is Standard Load there will be no markings indicating it but if it is Extra Load the letters XL will appear after the size and load index.
The first number is the load index if the tire is used in a single application, the second number is the load index if the tire is used in a dual application. Passenger type tires cannot be used in a dual application. Load Range is an older term that is still commonly used in the industry so you may hear your tire dealer reference it but the load index numbers are the best way to ensure you have the proper tire.
One important but often misunderstood facet about load index is that the load index numbers between standards organizations P-Metric vs Euro-Metric are not necessarily on the same scale.
Meaning that two tires in the two different systems that have the same load index number could have different maximum load capacities. Just as your load index number corresponds to a specific load, your speed rating letter corresponds to a particular speed capability based on a standardized laboratory test.
Of course, you should always follow legal speed limits on roadways. There is one last sizing type that you should know about, especially if you are in the market for off road tires for a light truck or SUV. Flotation sized tires are similar to LT-Metric tires in application except for a few important points. Number one, they cannot be used in dual applications and number two, an equivalent size tire may have different load capacity than its LT-Metric counterpart. The first number in the Flotation tire size is the overall diameter in inches.
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