On the sidewall of each tire you will see the very small letters DOT followed by a series of numbers. The date of manufacture is given by the last 3 or 4 numbers in the series. Before 1999 the last 3 numbers were "week, week, year", and after that the last 4 are "week, week, year, year",. For example, 2004 is the 20th week in 2004. On a tire made before 2000, then 458 would indicate the 45th week of 1998. If it's not clear which you have, just PM me the full DOT codes for each tire, and I'll translate the full codes for you. Nick.
Nick Crowhurst, Excella 25 1988, Dodge Ram 2500 Cummins Diesel. England in summer, USA in winter.
"The price of freedom is eternal maintenance."