What does 37x12.50R17 mean?

Tire sizes are easy to understand once you learn how to read them.  On this page you'll find a color-coded explanation of the 37x12.50R17 tire code.

37

This mark reveals that your tire has a diameter of 37 inches.

12.50

This number indicates that your tire has a width of 12.50 inches.

R

This letter denotes how your tire was constructed.  Radial is the standard construction method for about 99% of all tires sold today.

RRadial
BBias Belt
DDiagonal
17

The tire size was designed to fit rims or wheels that are 17 inches in diameter.