The sidewall height or "aspect ratio" of a 285/75/R16 tire is 75% of 285mm. The sidewall height is a percentage of the width of the tire. The second number on a metric tire is to calculate the side wall measurement. The sidewall or aspect ratio are used in metric tire sizes to determine the overall height of a tire. The third number generally preceded by an "R" is the wheel diameter. Divide this number by 25.4 to get the inch equivalent as there is 25.4 mm in 1 inch. The first number on a metric tire is the width in millimeters. Inch measurement tires are fairly easy to understand however metric tires use a more difficult system to read. Just type in a metric or standard size tire and click calculate. Again, if this is confusing, and it often is to anybody who isn’t immersed in tires, a Tread Connection representative can help you with that.Use our tire size calculator to calculate the diameter, width, sidewall, circumference, and revolutions per mile of any tire. If you go further, you could have trouble with your brakes. Not to worry.Īnother helpful hint - you’ll want to stay within 3 percent of the diameter and height of the original tire. We can help you quickly calculate your tire size. So that was a lot of information, and maybe your eyes are glazed over, and your brain feels as if it’s fogging up.īut if that still seems too overwhelming, just contact the TIA-certified tire experts at Tread Connection. An “S,” in this case, means that your car could go 112mph before your tires would possibly, well, explode. The last letter – “S” is our example – you use with another chart, and it’ll tell you how fast your car can go before your tires start to have a problem, like a blowout. Next in the example is “82,” which is a number that you use in a chart, which will tell you how much weight your car can carry. The next number in our example is “15.” That’s the diameter of the wheel rim, which is usually measured in inches. Radial ply construction is an industry standard, for what it’s worth. If you see a “B,” that means belted bias. You’ll get better steering and better overall handling. Confusing, yes, but the main thing to remember here is that, if safety is your primary concern, you want the aspect ratio to be 70 or a lower number. So, in this case, the tire’s section height is 60 percent of the tire’s section width. The aspect ratio is the percentage that compares the tire’s section height with the tire’s section width. In our example, the width is 205 millimeters. If there’s no letter, you have a metric tire, which is known as a European size. “ST” stands for “Special Trailer.” Those are tires for trailers. It stands for “light truck tire,” the type of truck that can tow a trailer or has a 1-ton load capacity. If you see an “LT,” you have a larger vehicle. That stands for “passenger vehicle tire.” That would include vehicles like SUVs, minivans, and even small pickup trucks. Chances are, you probably will have a “P” on the tire. Consider this your tire size code, and we’ll help you crack it. You’re going to see an alphabet soup’s worth of letters and numbers, like (just as an example), P205/60R15 82S. If it’s too faint to read, or you just don’t feel like stooping down to look at your tires, you’ll possibly also find the numbers on the driver’s side door jamb, the glove box door, or on the gas tank hatch, and failing that, it’ll be in your vehicle’s owner’s manual. The numbers, as you might expect, are on the sides of your tires. You’ll need to find some important numbers in order to calculate your tire size - but that isn’t difficult. Of course, if you are not interested in learning how to calculate tire size, and you just want somebody from Tread Connection to tell you what tire size you need and then install the tires, well, hey, we can do that, too.īut if you are interested in calculating tire sizes, here we go. So if you’re looking to have a ready answer, we’ll walk you through how to determine your tire size. Invariably, the question is: “What tire size would you like?”Īnd that’s when many of us will come up with a clever retort like, “Uh…” Or maybe: “Er…” Why would you? And yet, whenever in the past you shop tires and tire services, it’s probably the first question asked. If you don’t think about tires often, you probably don’t know your tire’s size.
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