The second set of numbers, “70” in our example, is the aspect ratio of the tire, or 70% of the total width of 285mm. The next set of numbers, “285” denotes the width of the tire’s tread, in millimeters. If the numbers were preceded by the letter “P,” it would mean the tire was made for a passenger car. In the size LT285/70/R18 on this Nitto Ridge Grappler (below), LT denotes the tire is made for a light truck. Metric sizing on off-road tires is typically preceded by letters.
You may have heard that a 285 is “pretty much” a 33” tire, but how are these numbers related? Let’s breakdown the difference between the two types of sizing. Tire sizes come in two forms, much like tool sizes: floatation sizing, and metric sizing. This is sometimes the largest printed set of numbers on your sidewall, but sometimes can be printed just as small as everything else, depending on the tire manufacturer. The first set of numbers we’ll be looking at denotes the sizing of the tire. In this article, we’ll explore some of codes and markings on off-road tires, and explain how they can be useful when choosing the right tire for your vehicle.
Having this knowledge will not only impress your friends, but it can help you make the most informed decision on your next tire purchase. But how do you know you’re getting the right tire for your needs? Beyond the aesthetic tread patterns and sidewall lugs, there is a wealth of information printed on the tire itself that can tell you pretty much everything you need to know about it. Off-Road tires can give your truck or SUV a distinct look, and greatly improve its performance.
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