185 55 r16意思

"185/55 R16" is a tire size designation, where:

• 185 refers to the tire's width in millimeters. This is the width of the tire from one sidewall to the other when mounted on a rim.
• 55 is the aspect ratio, which is the percentage of the tire's width that the tire's sidewall height is. In this case, the sidewall height is 55% of 185mm.
• R stands for "Radial," which indicates the construction method of the tire. Most tires produced today are radial, meaning the layers run perpendicular to the direction of travel.
• 16 refers to the diameter of the wheel in inches that the tire is designed to fit.

So, a tire size of 185/55 R16 means that the tire has a width of 185 millimeters, a sidewall height that is 55% of the width, a radial construction, and is designed to fit a 16-inch wheel.