![]() ![]() 103, with this tire, is a bit higher up than most tires. There’s a specific chart for this, and it tells you how much weight your tires can take. F (103) – Now, we get into the load index.Unlike the width, it’s measured in inches, so we have here a 20-inch diameter tire. E (20) – Following your tire construction, we get into the diameter of the wheel that the tires have to cover.In other words, this tells you what your tire is made of. D (R) – It should mean the type of tire you have, which in this example, is a Radial-type tire.To put it another way, the sidewall is 45% of the tire’s width. There’s a formula for this, and ours ended up as 45. This tells us the tire profile, or how tall the tire’s sidewall is. ![]() C (45) – This is the aspect ratio, and no, it’s not the same as the aspect ratio of your screen.Our tire right up there, therefore, should be 245 millimeters (mm) wide. B (245) – It’s the tire width, measured in millimeters.Unfortunately, our tire here doesn’t show it, but it appears often as the first letter. A – There should be a “P”, “LT” or “ST” right at the front of the tire size marker.Here’s how we break down what that aforementioned tire size (245/45 R20 103W) on the sidewall means… This includes dimensions, tire type, and so on. That’s because this entire string of letters or numbers tells you the entire specifications of your tire. To try and get a grip on this, it might prove useful to break them up into its constituent components. That said, there are easier ways to decipher what each of those letterings denotes. It’s in these situations that having a tire size chart could be rather handy. Here’s one example of the same tire you saw in the thumbnail up above, and what it says on the sidewall… Some figures are measuring in millimeters, while other measurements are in inches, for instance. Admittedly, it can be quite inconsistent. Reading what all that lettering on the side of your tires can feel like breaking the Enigma code when you’re seeing it for the first time. Conclusion What Do All Those Numbers And Letters On Your Tires Tell You, Anyway?.So, feel free to bookmark this anytime you head out to a tire shop… How do you know what tires are right, and which ones aren’t? To help you out, we have a detailed and comprehensive tire size chart to get you acquainted. It needs to pair up snugly, as far as you’re going to be concerned about its width, diameter, type, build, and so forth. Thus, you have to pick tires of the right dimensions for your wheels. Your tires have to hold out against immense pressure, load, and above all, last long enough that you won’t complain about needing a tire change every other mile. That’s what your tires have to go through. Only this time, take that analogy, but instead of walking speed, imagine it going at 100mph or more. One size too big, and you’ll be lucky it won’t fall out, unless you’re playing Cinderella. One size too small, and it’ll pinch your bones together. It’s just like getting an actual pair of shoes for your fleshy feet. The "R" means Radial tire and the last number, far right, is the rim diameter (in inches!).Are you happening to be shopping around for a new set of tires? It’s slowly turning cold out, so you’ll probably need to get some winter tires out soon, huh? Or, perhaps you just kneeled down and got a bit curious as you peeked at your car’s running shoes… What do all those numbers and letters mean on my tires, anyway? To help you along, what you need, ladies and gentlemen, is a tire size chart.Īfter all, getting the right tires for your car is crucial. The number to the right of the slash ("/") is the Aspect Ratio (percent of width). The bigger number (on the left) is the Section Width. "LT" means Light Truck and "P" means Passenger tire. Enter any three of the numbers into this form to solve for the fourth. For example a LT265/75R16 would be around 31.6 inches tall and 10 inches wide. This formula is a quick way to get the tire diameter of those metric tires that are common on just about everything stock. Most of the formulas dealing with gear ratios will want a tire diameter (measured in inches). Or you can just pull out the ole tape measure. Most of my calculators will ask for your tire diameter, if you have metric tires (most of us do) you'll need to get an estimate of how tall they are. This calc converts a metric tire to inches. METRIC TIRE TO DIAMETER (INCHES) CALCULATOR ![]()
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