“85” means 85 percent, which tells us that the tire’s sidewall height is equal to 85 percent of the tire’s width. Usually, when we write out a ratio, we use a colon to express it like “16:9” which is a common size ratio for computer screens, or “4.10:1” which is a common axle gear ratio, but that’s not how it’s done on tractor tires.
The “85” in the metric example is a ratio, represented as a percentage. That wasn’t too hard … but wait, there’s more! Aspect Ratio This example is actually the tire size I have on the rear of my 4×4 diesel tractor.Ī metric tractor tire sizes expression may look something like “520/85R42.” The “520” part means the tire is 520mm wide, “R” means it’s a radial tire, and “42” is the rim size expressed in inches, just like the standard method. The dash “-” indicates the tire construction is bias-ply, but this could be an “R” if the tire is radial. The “14.9” means the tire is 14.9 inches wide and the “42” tells us that this tire fits a 42-inch diameter wheel. The standard method of size expression is relatively simple, but not as descriptive as metric.Īn example of tractor tire sizes expressed in the standard format would be “14.9-42”. One method uses the “standard” format and the other is the “metric” format. Standard Size ExpressionĪs if the gibberish wasn’t cryptic enough, there are actually two ways that manufacturers can express their tractor tire sizes. The second step to picking replacements for your worn out tires is understanding your options and matching those options to your needs, since what your tractor came with from the factory may not be the best tire to do what you need it to do today. Understanding the gibberish printed on the sidewall of your tires is your first step to understanding what you need to buy to properly shod your mechanical workhorse. Different sized tractors call for different tractor tire sizes, and styles for that matter.
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