Can't you just do a search on the manufacturer of the tire and look up the recommend pressure rating on their website?
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74 GTO clone 
DONE 11.738 @ 114 mph
See my thread in Best Pontiac Stories 
http://forums.performanceyears.com/f...d.php?t=598985
Mrs. Rob B as of 9/25/2010
THE BEAR KILLER 
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