130 = tire width (mm) 90 = aspect ratio (height/width, %) – = tire construction (“–“ suggests bias-ply, "B" suggests bias-belted and "R" stands for radial construction. Sometimes, this piece of code will be omitted and “Radial” will be written elsewhere on the sidewall) 16 = rim diameter (in.)

Example: 130/90–16 (just the basics, there are several other things that may show in a tire size) 130 is the actual width of the tires in millimeters. 90 is the aspect ratio, width to height of the tire from the rim. So 90 percent of 130 millimeters is 117 mm. The -16 is the size of the rim in inches.

The numbers (77) represent the load carrying capacity of the tire. In this case, 77 means 908 pounds. A typical load rating chart shows 47 or 386 lbs all the way up to 87 or 1,202 lbs. The letters (H) represent the speed rating of the tire. In this case, H means a top speed of 130 miles per hour.