What Do the Numbers on a Tire Mean?
Feb 25, · Tire Size Guide: How to Read Tire Numbers and Letters. Tire Class. The tire class is indicated at the beginning of the tire code. Typically, you’ll see the letters P, LT, or ST, or no letters at all. These Tire Width. Aspect Ratio. Construction Type. Wheel Diameter. P =Passenger Car Tire The first letter on a tire indicates the tire’s class. P designates this tire as a passenger car tire, an LT before the tire size would mean the tire is a light truck tire, and a European metric tire would have no letter before the tire size. =Section WidthTread (mm).
This article was co-authored by Rocco Lovetere. This article has been viewed 36, times. Knowing how to read a tire can give you important information about the type of tire on your car, RV, trailer, or motorcycle. This can be useful when buying replacements for your vehicle, considering tire upgrades, how to read tire numbers and letters changing to seasonal tires if you live where winter weather can be an issue. By knowing how to interpret the numbers and tirf on a car tire, you can know the speed rating, temperature resistance, load index numbers, as well as the tire's width and rim diameter.
The letter indicates how adn tire was constructed, with "R" standing for radial construction and "B" standing for biasply. The final 2 numbers are the rim diameter in inches. Numbwrs more advice from our Mechanic co-author, like how to yow your tire's speed rating, scroll how to get rid of tonsil pain Did this summary help you? Yes No.
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Article Summary. Read the manufacturer and the tire name. These are printed in large letters toward the outside of the tire. They say the name brand of the company, such as Hankook, or Michelin, or Goodyear. Look at the service description. The service description, amd it doesn't appear on every tire, is usually right after the manufacturer name. Find the width and aspect nymbers. This is a series of numbers right after the service description.
The first series what are the best free spyware removal programs three numbers tells you the width of the tire tread in millimeters. Width tread may range from to The two numbers after how to play combat arms north america in europe slash show reac aspect ratio of the tire.
This is the tread-width percentage that is uow to the sidewall's height. The average ranges from 55 to 75 percent in most passenger vehicles. Know the internal construction of the tire. Most likely an "R," this mark usually comes right after the aspect ratio. Some trucks may have a "B" instead, which stands for bias-ply, but which has largely been discontinued due to poor handling issues.
Know the rim diameter. Usually anf after the internal construction, it's the rim size for which the tie was fitted. So, for example, if you have 22 inch The letters in the position of SC or C signify the speed rating of the tire pre or the construction of the tire.
Lehters "R" means the tire is of radial construction. If there is an "HR," this is a high-speed radial tire. Find the tire's load index. This number is extremely important, as the load index is the tire size's relative load carrying capabilities. The higher numbwrs load index number, the larger load carrying capacity. The index is not a hard number; it's just a how to read tire numbers and letters of sorts.
To find out how much your entire car can carry without putting undue strain on your tires, multiply the number you found in the Load-Carrying Capacity Per Tire chart by four. You have four tires, after all. Never replace your tires with ones that have a lower load index than the original tires.
You always want to have tires with the same, or higher load index. So, if you had tires with a load index of 92 to start off, nummbers want tires with at least an index of 92 or higher. Find the tire's speed rating. The speed rating indicates that the tire can carry a specified load up to a certain speed. Find the temperature-resistance rating.
This signifies the tire's resistance to what does yare yare mean generated at high speeds on the tire's inside portion.
Find the cold inflation numbers near the inner edge of the tires. This tells you the pressure the tire should be at to optimize tire jow.
Include your email address to get a message when this question is answered. If you're having difficulty to determine the meaning of the numbers on a tire, refer to your vehicle's owner's lletters to discover the type of tires recommended for your vehicle. Helpful 0 Not Helpful 0. Related wikiHows How to. How to. About This Article. Co-authored by:. Rocco Lovetere. Co-authors: Updated: February 27, Categories: Featured Articles Tires and Suspension. In other languages Italiano: Leggere le Sigle su uno Pneumatico.
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Everything You Need to Know Is on the Sidewall. () Tire Width. The first number in this series refers to the tire's section width, or the distance from sidewall edge to sidewall edge, measured in (65) Aspect Ratio. This number is the tire's aspect ratio, or its section height compared to its. Let’s take a look at what each number or letter stands for, one by one, in the order they appear in your tire size data. We'll be using this tire size as an example: P/70R16 91S. THE LETTERS “P” AND “LT” For most vehicles, you’ll see the letter “P” before the number sequence begins: P/70R16 91S. The “P” is short for “P-metric” which is a designation by the Tire and Rim Association for a “passenger car” tire . Jun 11, · Steps 1. Read the manufacturer and the tire name. These are printed in large letters toward the outside of the tire. 2. Look at the service description. The service description, although it doesn't appear on every tire, is usually right 3. Find the width and aspect ratio. This is a series of 94%(17).
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But what does it all mean? Fortunately, the answer to this question is yes. Here, a standard set of interchangeability guidelines is governed by The Tire and Rim Association for all manufacturers of tires in the United States. They also have established relationships with most major tire manufacturers in Japan, Europe, South America, and other parts of Asia. These are typically installed on passenger cars, light trucks, SUVs, and vans.
The first set of numbers in the numerical sequence indicates the width of your tire as measured in millimeters from sidewall to sidewall. While there are exceptions, a lower aspect ratio is often indicative of a sportier, more performance-oriented tire while a higher aspect ratio tends to indicate the tire was designed for other priorities like comfort or rugged durability.
Today, tires featuring Radial construction are by far the most common type. Radials became the dominant type of construction because of their superior fuel economy, traction, ride comfort and especially tread life when compared to earlier types of construction. This type of construction dates back to the earliest pneumatic tires.
It was the preferred design for many years because of its resistance to damage from poorly paved or unpaved roads and relative ease of construction on the building machines available a century ago.
Belted Bias tires combine the diagonal ply casing of Bias tires with belts usually made of fiberglass under the tread for increased traction and tread wear vs conventional Bias ply tires. Both Bias and Belted-Bias ply tires are available today primarily as reproduction tires for antique vehicles, though some racing, trailer and off road light truck tires use these types of construction, too. The next number in the set indicates the rim diameter—sometimes also noted as the wheel diameter.
This measurement is almost always given in inches. The next number, which is paired with a letter, indicates the load index for that tire. The load index is the maximum amount of weight that an individual tire can carry. In Europe, some highways have speed limits higher than those in North America — and a few have no limits at all.
Simply put, the speed rating is the maximum speed at which a set of properly inflated tires may be driven. You can find more information about tire speed ratings here. Close to where the sidewall meets the tread, you will also find the Treadwear, Traction, and Temperature grades. These grades are assigned by each tire maker to its own products. It is located near the rim, and it starts with the letters DOT.
The final four digits indicate the week of manufacture followed by the last two digits of the year of manufacture. For example, would indicate a tire manufactured during the 50 th week of On the sidewall opposite the one with the full DOT code, only the letters DOT and the first four digits of the code are required. This information includes both the ply composition—that is, the number of layers as well as the type of materials that were used in its construction.
This might be different from the inflation pressure recommended for your vehicle by its manufacturer. You probably know what tire tread is: the part of the tire that makes contact with the road surface. But what you might not know is that the specific tire tread pattern your tire utilizes can impact how your tires perform, such as how they handle and how much traction they provide in different driving conditions.
The most common tread pattern in use on passenger tires is the symmetric tread pattern. In these types of patterns, the outer and inner sides of the tread are symmetric—that is, they are mirror images of one another. The tread blocks form continuous ribs around the tire.
Tires with a symmetric tread may use any type of rotation method — front-to-back, modified X or full X. This is because the tire can be mounted on the wheel and rotated in any direction without affecting performance. Another tread type found on passenger tires is the asymmetric pattern. In these types of patterns, the inner and outer halves of the tread are designed with different channels and tread blocks.
This design is intended to enhance performance such as water dispersal or dry grip and snow traction. In the example above, the Bridgestone Turanza Serenity Plus all-season touring tire, you can see how the left outer side of the tire tread features chunkier tread blocks that provide a larger contact area for increased stability and handling on dry roads. The right inner side of the tread pattern features more channels and smaller tread blocks to aid in channeling water away for improved rain traction.
Multiple rotation patterns may be used for this type of tire. Some tire tread patterns are designed for rolling in a unidirectional way, meaning in only one direction. These are called directional tread patterns and are often found in high-performance tires and winter tires.
This V-shaped tread pattern helps move water more efficiently from under the contact patch to help boost hydroplaning resistance at higher speeds. Directional tires will feature an arrow on the sidewall indicating which direction they need to roll when mounted on the car. Learn about everything from proper tire care to the advantages of Bridgestone's breakthrough tire technology and everything in between.
Knowing the ins and outs of buying tires can be overwhelming, so we've put together a practical tire buying guide to give you the information you need to make an educated and confident decision.
There are two main types of winter tires: studded and studless. Studded tires were the must-have snow tires for a long time, but advances in rubber compounds and other winter tire technologies have changed the minds of many drivers. Your car's tires are a vital part of any journey, and making sure they're in top shape before you hit the road is even more important than making sure the right playlist is ready to blast out of the car's speakers.
Cancel Send. Tire Width The first set of numbers in the numerical sequence indicates the width of your tire as measured in millimeters from sidewall to sidewall. Rim Diameter The next number in the set indicates the rim diameter—sometimes also noted as the wheel diameter.
Other Information Found on the Tire Sidewall 1. Load Index The next number, which is paired with a letter, indicates the load index for that tire.
Speed Rating In Europe, some highways have speed limits higher than those in North America — and a few have no limits at all. Find Your Tire Bridgestone - Tire Tread Patterns You probably know what tire tread is: the part of the tire that makes contact with the road surface.
Find Your Tire Symmetric Tread Pattern The most common tread pattern in use on passenger tires is the symmetric tread pattern. Asymmetric Tread Pattern Another tread type found on passenger tires is the asymmetric pattern.
Directional Tread Patterns Some tire tread patterns are designed for rolling in a unidirectional way, meaning in only one direction. How to Buy Tires. How to Buy Tires Knowing the ins and outs of buying tires can be overwhelming, so we've put together a practical tire buying guide to give you the information you need to make an educated and confident decision. Learn More. Studded Snow Tires vs. Studless Snow Tires. Studless Snow Tires There are two main types of winter tires: studded and studless.