What’s the Middle Number on a Tire? Aspect Ratio Guide
The middle number on a tire is the aspect ratio, which expresses the tire’s sidewall height as a percentage of its section width. In a size such as 205/55R16, the number 55 means the nominal sidewall height is 55% of 205 millimeters, or 112.75 millimeters. Key Facts at a Glance The middle number in 205/55R16 […]