How to Interpret Tire Sidewall?
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By | 20 June 2020 | 1 Comments

How to Interpret Tire Sidewall?

How to Interpret Tire Sidewall?
Want to know when your tires were made or how big? You need to know how to read tire sidewall information, which is an alphanumeric code printed on the side of the tire. However, if you have ever seen the sidewall of a tire and think that the blizzard of numbers, letters and words is as confusing as pictographs, then we will understand. The alphabet on the tire sidewall can be annoying, but once you know what you want to view, it's easy.

In addition to the brand (Michelin, Continental, Hankook, etc.) and model name of the tire, the large amount of data printed on the sidewall can also meet the requirements of government regulations, which require a variety of information, including the time and place of manufacture of the tire. strong and sturdy. do not worry. Let us be your guider to interpret the language of the tire sidewall. This is all you need to read the tire sidewall information. The numbers highlighted in pink on the example tire below correspond to the following description.

1-4) These are the most important numbers on any tire because they tell you how big the tire is. In this case, the widest part of the tire is 245 mm (when mounted on a wheel of specified width). The number after the slash indicates its aspect ratio or outline. The sidewall height of this tire is 40% of its width. "R" stands for radial structure (rare bias ply and belt tires are denoted by D and B, respectively). The number 18 indicates that this tire is suitable for 18-inch wheels. Sometimes, the letter is before the first digit. "P" stands for p-metric, which is mainly used for passenger car tires. "LT" stands for light type truck tires. "T" indicates that it is a backup tire. Some tires have a meridian indicator with "Z" or "F",

The alphanumeric code is the service description, which provides two key insights about tire performance: how much weight the tire can carry and how fast it can run safely-the the latter can be a good indicator of whether it is used in a family car or hot Sporty machine. In our example, "93" represents the maximum rated load of 1433 pounds. The letter W represents the maximum speed rating, which is equivalent to 168 miles per hour (hours), which is not the speed of the mom's minivan. See the list of speed ratings below, ranging from a low "L" (some off-road tires are only 75 mph) to a high Y (186 mph). There is also a special super-high-speed rating: If the service description for a Y-rated tire is surrounded by brackets, such as "(93Y)", it means that the speed rating of the tire is "over 186 mph". There are also Z-class tires, but when this name comes out, no one thinks that a speed of more than 149 mph is needed. By definition, all W and Y tires are also Z, although not all tires have the word "Z" printed on the sidewall.
L - 75 mph
M - 81 mph
N - 87 mph
P - 93 mph
Q - 99 mph
R - 106 mph
S - 112 mph
T - 118 mph
U - 124 mph
H - 130 mph
V - 149 mph
W - 168 mph
Y - 186 mph
(Y) - more than 186 mph

6) Many but not all tiremakers note the heaviest spot of the tire with a red dot. It ultimately has no bearing on tire-and-wheel balance, so it's of little importance.

7) The numbers after the word "treadwear" indicate (surprise!) the treadwear of the tire, or how long it's likely to last. The higher the number, the more likely it is that you'll get more miles out of it. But the tests that determine tread life are not exact. The experts at tire-seller Tire Rack report that treadwear ratings can vary. They cite the example of two different tires they sell—one from Goodyear and the other from Continental—both of which offer an 80,000-mile tread-life warranty. You'd expect them to have similar, if not identical, treadwear ratings, but the Goodyear's is 740, while the Continental's is 600. So take this number as an indicator, but not an exact predictor, of how long a tire will last.

8-9) The letter after the word "traction" is a rating that results from a test of how much grip a tire generates when dragged across wet pavement without the tire rotating. It's not of great relevance to today's cars, which have anti-lock brakes that keep the tires rolling even during emergency braking. The letter following the word "temperature" is an indicator of how well a tire dissipates heat, which increases severely at high speed. Again, it is of less importance than the tire's speed rating, which takes this into account.

10-11) Some tires carry an "M+S" marking, which stands for "mud and snow." It means that the tire has some added capability in those circumstances because it has a little extra space between its tread blocks. But such tires are absolutely not winter (snow) tires and might not even be conventional all-season tires. That's where the three-peak mountain snowflake icon next to the M+S mark comes in. If a tire has that molded into its sidewall, it has significant snow capability and should be considered a viable winter tire.

12) This area of the tire may display what's called the original-equipment (OE) marking. Automakers sometimes take a standard, off-the-rack commodity tire and modify its construction or rubber compound to work better on one of their models. So, a Ford Escort and a Chevy Cruze might both be equipped with Firestone Firehawk AS tires that look virtually identical, but each car's tires might differ significantly in ways that affect the ride and handling. If your vehicle's tires carry an OE code, it's best to replace them with the same brand and model of the tire wearing the same code—if you can. Tire stores and online retailers can help you with finding tires with the correct OE code for your vehicle.

13) This is a list of the tire's construction materials, of interest primarily to tire engineers and tire geeks.

14) Every tire sold in the U.S. must have the U.S. Department of Transportation (DOT) labeling. The first two characters indicate the factory of manufacture, and the next five or six are manufacturer-specific jargon (for tracking purposes, as in the case of a recall). The last four numbers give the date of production which let you know how old your tires are with the first two digits indicating the week and the latter two the year (for example, "2318" means that tire was produced in the 23rd week of 2018). The European equivalent of the DOT code may also be present (it starts with an "e"), although fewer manufacturers are printing both on a tire's sidewall. If this string of numbers ends with "-S," it means the tire complies with European noise regulations.

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