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.
Excessive wear on the tires occurs when the tires are unbalanced. Unbalanced tires cause increased stress on a specific area of the tire. These stresses combine with the uneven motion to cause vibration, which leads to excessive wear and a greater risk of deflation.