What does the number 205 indicate in the tire designation "P205/70R15"?

The number 205 in the tire designation "P205/70R15" represents the cross-sectional width of the tire in millimeters. This measurement is taken from sidewall to sidewall and indicates how wide the tire is when mounted on a standard rim. Knowing the tire's width is crucial for ensuring proper fitment on the vehicle, as well as for contributing to handling characteristics and overall performance.

The other options relate to different aspects of tire specifications: the aspect ratio, found in the second part of the designation, measures the height of the tire's sidewall as a percentage of the width. The diameter mentioned refers to the size of the wheel that fits the tire, and this is provided at the end of the designation. Maximum load capacity is not indicated directly by the number 205 but is instead specified in a different part of the tire's specifications or markings. Understanding these distinctions enhances one's knowledge of tire designations and how they relate to vehicle performance and safety.