Buying Tires Guide: What Do the Tire Numbers Mean?
Rim Diameter. The following tire numbers represent rim/wheel diameter (measured from one side to another). The two-digit number is in inches and the most regular sizes are the following: 8Ф, 10Ф, 12Ф, 13Ф, 14Ф, 15Ф, 17Ф, 18Ф, 19Ф, 20Ф, 22Ф, 23Ф, 24Ф, 26Ф, 28Ф. You can see such tires on most passenger vehicles. These tires have plies that are laid out in a diagonal, or crosshatch, pattern. Tire Diameter or Size: /65 R The very last number in the sequence, У15,Ф is the diameter of the tire. This is an important numberЧthis is the number youТll refer to when you need to know your tire size! The У15Ф indicates that this particular tire would fit a rim with a inch diameter.
Tires are some of meah most misunderstood parts of a vehicle. There is confusion surrounding when they are worn out, correct pressure, rotation schedules and formats, and more.
But nothing is as confusing to the average driver than all those numbers on the sidewall of your tires. See all those numbers on the side of your tire? Confusing, right? When you look on the sidewall of a tire, you will notice two prominent things: the brand name and size. The latter will have a few formats but is simple to find.
So, in this example, the tire is millimeters Ч 9. This is the height of the sidewall from wheel to tread relative to the width. In our example size, the no will fit a inch wheel. This is a debatable topic, but with modern vehicles having such tight tolerances, it is always best mechanically to only install the recommended tire size.
Changing the size on a modern vehicle can cause a dip in fuel economy, abnormal handling, rubbing, alignment issues, and unnecessary stress on the powertrain. Generally, the worst issue you will cause by changing the size is an inaccurate speedometer. That said, the only dimensions you can change are the width and aspect ratio Ч never the wheel size, unless you buy replacement wheels Ч and you should always strive to keep the total height of the tire the same as the OEM. So, if you widen the tire, you may need to decrease the aspect ratio, and vice versa.
Did you know tires what do you mix with bacardi rum have a load limit?
What numbers mean on tires next to the tire size, you will see two numbers followed by a letter. On most cars, tires will range from the highs to the numbbers, while light-truck tires will fall somewhere from the mids to This load index is per tire, so if you have four tires with a 93 load index, they can hold 5, pounds.
If your vehicle weighs 4, pounds and the tires have a 93 load index, you can add up to nukbers, pounds of people and stuff without risking a blowout. While this load index is rarely of any concern to the average car owner, it plays a huge role when towing and hauling with a truck or SUV.
This indicates the maximum speed the manufacturer designed the tire to handle. Like the load index, you need a chart to figure out what speed each letter translates to. Well, look at that Ч we have one below. This digit identifier shows what factory the manufacturer built the tire, and the week and year it built the tire in.
This date code will be the last four digits in the code. The first two digits represent the manufacture week and the second two represent the manufacture year. In the example above, the DOT Number has a date code ofwhich means the manufacturer built it on the 45th week of Typically, the only number you want to pay attention to is the two-digit year code at the end as this tells you roughly how old the tire is.
You may think you only need to worry about this when buying a used tire or considering replacing your old shoes, but you also need to look at this when buying new tires. Yes, this is generally true, but if your vehicle has a rare tire size, they may have sat on the shelves for years before you came by to rescue them. Unfortunately, rubber ages while sitting on numbrs shelf, and this could cause issues down the road.
Even when buying new tires, always ask to see the exact tires the shop will mount on your vehicle and check that date code. Whaf the tires are over 2 william sutcliffe whatever makes you happy old, ask for a set with a newer date code. Remember, there is no need to be a stickler here and ask the tire shop to go tearing through the entire tire room to find younger rubber Ч only resort to this if they are too old.
Just like some foods and restaurants, tires get a government grade. Treadwear is the easiest to decipher as it is a three-digit number that indicates how long tread on the tire will last relative to other tires. In theory and in similar conditions, a tire with a treadwear rating will last three times as long as one with a rating, and so on.
This one is sneaky because the government does not require manufacturers to accurately state the treadwear, so long as they do not exceed the official rating. So, a manufacturer can underrate one of its cheaper tires if it outperforms a premium tire to create perceived value for the pricier tire.
The traction rating represents how well the tire performs on wet asphalt and concrete. For the average consumer, all that matters is what numbers mean on tires ratings from best traction to worst are AA, A, B, C. Finally, the temperature rating. Man come in one of three temperature ratings, men they are as follows:.
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More info included in the tire size
Next you will find a slash and then another set of numbers: the aspect ratio, sometimes called the tireТs УprofileФ. This number is a percentage that indicates the tireТs height vs. its width. In the example above, the aspect ratio of our tire is 65, meaning that this tireТs height is 65% of its width. The two-digit number that usually follows the tire's section width tells us the aspect ratio, or tire profile measurement. In this example, the 45 indicates that the sidewall distance, from the wheel rim to the outside of the tread, is 45% of the section width. Oct 08, †Ј The Department of Transportation number, which some also call the tire identification number, is the longest string of numbers and letters youТll see on the tire. This digit identifier shows what factory the manufacturer built the tire, and the week and year it built the tire in. This date code will be the last four digits in the code.
We pre-selected this store based on your location to give you more accurate pricing, inventory and service offerings. Goodyear Auto Service - Summit Mall. Fairlawn, OH This store is based on your location. Change Store. Enter your location for the closest stores in your area. 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 and 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.
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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.
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