On Tuesday, July 8, 2014 7:49:17 PM UTC-4, Eric Greenwell wrote:
doesn't carry the "ST" trailer

Since all ST tires are rated to only 65 mph,
I conclude that ST stands for S--tty Tire.

Slightly more humourous, I was looking for a DOT number to determine the age of my spare tire. No DOT number found, but it did say MADE IN POLAND (in English). So based on 1999 date of import, the spare is 15 years old! It is flat of course.