What does 225/50R17 mean for tires?

[DeDaniela]

Here is the meaning of 225/50R17 for tires: 1. 225 indicates the tire section width, measured in millimeters. Generally, tire widths range from 145 to 285mm, in increments of 10mm. 2. 50 is the aspect ratio, which is the ratio of the tire sidewall height to the tire section width. 50 represents 50%, and tire aspect ratios typically range between 30% and 80%. 3. R indicates that the tire has a radial construction. 4. 17 is the outer diameter of the wheel rim, measured in inches. Normally, regular passenger cars should not use tires with an aspect ratio greater than 75%, while luxury cars and high-performance sports cars are recommended to use tires with an aspect ratio less than 60%.