The first two of these four numbers identify the week of manufacture (which range from "01" to "53").
The last two numbers identify the year of manufacture (e.g., a tire with the information "DOT XXXXXXX2714” was manufactured in the 27th week of 2014).
The chronological age of any tire can be found on the tire sidewall by examining the characters following the symbol "DOT".
The last four numbers identify the date of manufacture of the tire to the nearest week.
So, when I purchased this used truck, it already had five-year-old tires.
They also had very tiny sidewall cracks in a few areas.
For tires manufactured prior to the year 2000, three numbers instead of four indicate the date of manufacture.
Also, during the early 1990’s, Continental added a triangle (◄) to the end of the character string to distinguish a tire built in the 1990’s from previous decades (e.g., a tire with the information "DOT XXXXXXX274◄” was manufactured in the 27th week of 1994).When we purchased our used tow vehicle, a 2005 Freightliner Sportchassis in early 2009, it had been kept garaged by the owner, and looked like new!The DOT code on the Michelin RV tires showed a manufacture date in early 2004.I did wind up replacing them in 2010 because it was not worth the damage that could have been caused by an aged related issue from a Michelin RV tire failure.During an early summer trip in 2009, with tire pressure monitors installed on the 5th wheel, we headed for South Florida and ultimately to the Keys.If the RV sits out most of the time it might be better to replace them every five years.