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.
Directional Tires will have an arrow on the sidewall. If it doesn't have an arrow, it's non-directional! and it doesn't matter which way it rotates. If you mount a directional tire backwards - so that it is rotating the wrong direction - the only problem caused is wet (or snow) traction.