And the 15 is the size of the wheel it's designed for. So, in this case you've got a 31-inch tall tire for a 15-inch wheel. You know the wheel radius is 7.5-inches, and the tire radius is 15.5 inches.

Consumer Reports deciphers the cryptic sidewall codes on a typical tire, explaining how to decode tire size, load index, maximum pressure, speed rating, and more.

Selecting the proper tire size for you motorcycle is important for your safety. Here is everything you need to know about replacing motorcycle tires.

Yokohama Tire announced a major size expansion of its versatile all-terrain tire, the GEOLANDAR A/T4™ G018. The tire, ...