205 50r17意思

"205 50R17" is a tire size designation, indicating the tire's width, aspect ratio, construction method, and wheel diameter. Here's what each part of the designation means:

  1. 205 - This is the tire's width in millimeters. It means the tire is 205 millimeters wide from one sidewall to the other when it's mounted and under normal atmospheric pressure.

  2. 50 - This is the aspect ratio, which is the ratio of the tire's sidewall height to its width. In this case, the sidewall height is 50% of the tire's width. So, the sidewall height is 205/2 = 102.5 millimeters.

  3. R - The "R" stands for "radial," which means the tire is constructed with radial ply, a standard method for tire construction where the tire's ply cords extend radially across the tire from bead to bead.

  4. 17 - This is the wheel diameter, indicating that the tire is designed to fit on a wheel with a diameter of 17 inches.

So, a tire size of 205/50R17 means the tire is 205 millimeters wide, has a sidewall height of 102.5 millimeters (50% of the width), is a radial tire, and is meant to be used with a wheel that has a diameter of 17 inches.