What Is a Social Security Number (SSN)? A SSN is a nine-digit identifying number is in the format xxx-xx-xxxx. Any individual who is a U.S. Citizen, a permanent resident, or a temporary alien resident who is authorized to work in the United States, must have a SSN.
The most common cause of a flat tire is puncturing of the tire by a sharp object, such as a nail, letting air escape. Depending on the size of the puncture, the tire may deflate slowly or rapidly.
Flat Tire Source #2: Valve Stem Leaks. Sometimes the valve stem may get a leak in it from dirt inside the valve or because itâs old. A lot of times, the valve stem may get cracks in it because of wear and tear. This causes a leak, leading to a flat tire. Often times, this can be fixed by replacing the valve stem.