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.
A faulty valve stem can cause your tires to release air and leave you with a flat tire. Having it repaired by professionals can cost upwards of thirty dollars, but in some instances, you may be able to replace a faulty stem yourself.