Narrative:

The tire was on the shelf too long. Air must have leaked out.

Google
 

Original NASA ASRS Text

Title: A B757-200 INCURRED A DELAY WHEN A PREVIOUSLY INSTALLED MAIN TIRE WAS FOUND OUT OF LIMITS AND REQUIRED REPLACEMENT.

Narrative: THE TIRE WAS ON THE SHELF TOO LONG. AIR MUST HAVE LEAKED OUT.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.