How to Read a Tire Size
R =RadialConstruction. In this example, the R designates this tire as a radial tire. Radial tires have layers of fabric whose cords run at right angles to the circumference of the tire and whose tread is strengthened by additional layers around the circumference making it the most common type of automotive tire. Sep 16, · This letter denotes the style of the tire. The letter “R” in the above example shows the tire construction type as ‘radial.’ R. R or “Radial” tires are the most popular style of tire out there. In this setup, in the carcass, the cable plies radiate around the axis of .
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The letter "P" at the beginning of the "Tire Size" tells us the tire is a P-Metric tire, referring to tires made to certain standards within the United States, intended for Passenger vehicles. If a tire size has no letters at the beginning, this indicates a Euro metric tire.
P-Metric and Euro-Metric tires may have different load capacities. The letters "LT," either at the beginning or at the end of the tire size indicate the tire was designed for light trucks. Vehicle manufacturers equip some light trucks with "LT" type tires. These tires generally require higher inflation pressures than passenger tires. Consult your owner's manual or tire placard for the recommended tire size how many years of school to become an acupuncturist inflation pressure for your vehicle.
Department of Transportation to provide consumers with information to help them purchase tires based on their relative treadwear, traction and temperature capabilities.
Traction grades indicate the wet traction of a tire under a controlled test. A tire with an "AA" rating offers outstanding traction in wet conditions. Temperature grades indicate the ability of the tire to withstand and dissipate destructive heat.
A tire with a higher temperature grade is able to operate at higher speeds. Treadwear grades are based on standardized government tests to help predict the expected treadwear of a tire.
For example, a tire with a treadwear grade of should last twice as long as a tire with a treadwear grade of You are leaving the Goodyear Auto Service website and are being directed to a website run by a company other than Goodyear. You are leaving the Goodyear Auto Service website and are being directed to a website run by Citigroup, which issues the Goodyear Credit Card. Please enter a new location that is within the highlighted range on the map or choose to visit one of our stores instead.
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See Details. When you purchase and install a set of 4 Goodyear or Dunlop tires. Includes tires, alignment, brakes, wiper blades, PM fluids and air conditioning. How to Read a Tire Size. What's On Your Tire's Sidewall?
With a little explanation it's easy to understand what all of the letters and numbers mean on your tire's sidewall.
The numbers are indicators of the size, type, and performance of the tire. Enter your information to see the tires that fit your vehicle. Find Tires. Tire Type The letter "P" at the beginning of the "Tire Size" tells us the tire is a P-Metric tire, referring to tires made to certain standards within the United States, intended for Passenger vehicles.
Tire Width Is the width of the tire measured in millimeters from sidewall to sidewall. The first three-digit number in the tire size refers to the tire width. Aspect Ratio Is the ratio of the height of the tire's cross-section to its width. The two-digit number after the slash mark in a tire size is the aspect ratio. The bigger the aspect ratio, the bigger the tire's sidewall will be. Construction The letter "R" in a tire size stands for Radial, which means the layers run radially across the tire.
Wheel Diameter Is the size of the wheel measured from one end to the other. It tells us the size of the wheel that the tire is intended to fit. Load Index Indicates the maximum load that the tire can support when properly inflated. You'll also find the maximum load on the tire sidewall, in both pounds and kilograms. Learn more about tire load index. Speed Rating Tells you the maximum speed capability of a tire. Often speed ratings are matched to the top speed capability of the vehicle.
Goodyear does NOT recommend exceeding legally posted speed limits. Learn more about tire speed rating. Temperature Grades Speeds in mph A Over B Between and C Between 85 and Treadwear grades are based on standardized government tests to help predict the expected treadwear of a tire. Learn More. Tire Maintenance. Tire Pressure. Tread Depth. This tire is already added to your appointment.
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Example of Tire Size Specifications
In this example, the R means that the tire has radial construction. Over 98% of all tires sold today are radial tires, where the internal body plies of the tire radiate outward from the center. If there's a D instead of an R, the tire has a bias ply construction, meaning that the internal body plies of the tire crisscross on a diagonal pattern. R indicates the construction used within the tires casing. R stands for radial construction. B means belted bias and D stands for diagonal bias construction. 16 The last dimension listed in the size is the diameter of the wheel rim, which is most often measured in inches. If a tire size reads, LT/75R15 /S, the LT indicates that this tire is meant for. It’s the height of the sidewall measured from wheel rim to top of the tread, expressed as a percentage of tire width. In other words, it’s sidewall height divided by tire width. In this example, the aspect ratio is 65, meaning the sidewall is 65 percent as high as the tire is wide.
We investigated and have the answer sort of. There's a massive amount of information branded on the sidewall of every tire The tire size is just one small piece of this code. Read on to learn how to crack the tire code with this handy guide dedicated to tire types, sizes, and construction. Most tire sizes begin with one or more letters -- for example, P or LT. The letter tells us what type of vehicle or service the tire was designed for.
P-Metric tires are the most common type of tire. Metric tires, also known as Euro-Metric tires because the sizing originated in Europe, don't have a letter designation. Euro-Metric sizes are equivalent to P-Metric sizes in dimensions, but Euro-Metric sizes have subtle differences in their load-carrying ratings and capabilities. Euro-Metric tires are usually found on European cars, but they're also used frequently used on SUVs and vans. Light Truck Metric tires sizes begin with the letters LT.
These tires are designed for use on vehicles used to tow trailers or carry heavy loads. If the tire size begins with a T, it means that the tire is a temporary spare.
Also known as mini spares or space savers, temporary spares are designed for short-term use until the regular tire is repaired or replaced. Tires beginning with ST are special trailer tires and should only be used on car, boat, or utility trailers. Euro-Metric tire sizes ending with a C are commercial tires, for use on delivery trucks and vans capable of carrying heavy loads. In addition to the C designation, these sizes are also branded with a load range and service description rating load range B, C, or D.
The three digits following the service type prefix if present tell us the cross-sectional width of the tire in millimeters. In the example above, the tires width, measured from the widest point of the inner sidewall to the widest point of the outer sidewall when properly mounted, is millimeters.
The section width can be converted to inches by dividing the width in millimeters by The two-digit number that usually follows the tire's section width tells us the aspect ratio, or tire profile measurement. A lower aspect ratio means a lower-profile tire with a shorter sidewall, while a tire with a higher aspect ratio will have a taller sidewall and look more like a donut. Because we know that the tire size shown in this example has a section width of 8. Again using our example tire size from above, the 17 means that the tire should be matched to a inch diameter wheel.
Tires usually come in the following widths in inches : 8, 10, 12, 13, 14, 15, 17, 18, 19, 20, 22, 23, 24, 26, and Tires in these sizes are typically found on most passenger cars, light-duty light trucks, SUVs, minivans, and vans.
Tires with a rim diameter measured in inches are called "inch rim" sizes. In addition to the inch rim sizes, there are also some unique tire sizes out there.
Although not as common, tires are made in half-inch diameters for some heavy-duty light trucks, box vans, and heavy-duty trailers. These sizes are usually Tires and wheels with unique rim diameters should never be combined with traditional inch rim tires and wheels. Before mounting tires on wheels, the tire and wheel diameters should always be confirmed to match. When a letter R, D, or B follows the two-digit aspect ratio, it tells us the tire's construction.
In this example, the R means that the tire has radial construction. If there's a D instead of an R, the tire has a bias ply construction, meaning that the internal body plies of the tire crisscross on a diagonal pattern. In belted tires marked as B , the internal plies crisscross like in a D construction, but there's also an extra layer of reinforcing belts under the tread area. Belted tires are rarely seen these days. Today, the only speed rating still included in the tire size is the Z rating sports cars.
Since , all other speed ratings are included in the service description, as shown below. Since , the service description rating is mandatory for all speed ratings except Z-rated tires and appears at the end of the tire's size brand. The service description is used to identify the tire's load index 91 in the example above and speed rating V in the example. For more on load indexes and speed ratings, read Breaking the tire code: Understanding tire service description, load index, and speed rating.
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