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.
Tire balance or bent rim, alignment can't cause a vibration directly. It can wear the tires to the point that they vibrate, but the actual alignment won't make it shake. Edit: Also a bad tire can cause this. e.g.: out of round tire, but not unbalanced. #3 May 6, 2004.