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Discussion Starter #1
Interesting article about determining tire age;

When it comes to determining the age of a tire, it is easy to identify when a tire was manufactured by reading its Tire Identification Code (serial number). Unlike vehicle identification numbers (VINs) and the serial numbers used on many other consumer goods (which identify one specific item), Tire Identification Codes are really batch codes that identify which week and year the tire was produced.

The U.S. Department of Transportation (DOT) National Highway Traffic Safety Administration (NHTSA) requires that Tire Identification Code be a combination of eleven or twelve letters and numbers that identify the manufacturing location, tire size, manufacturer's code, and week and year the tire was manufactured.

Today, the week and year the tire was manufactured is contained in the last four digits of the serial number, with the 2 digits used to identify the week a tire was manufactured immediately preceding the 2 digits used to identify the year.

Examples of tires manufactured since 2000 with this Tire Identification Code format:
XXXXXXXX 0600
XXXXXXXX 0600 06 - Manufactured during the 06th week of the year
XXXXXXXX 0600 00 - Manufactured during 2000

And
XXXXXXXX 0604
XXXXXXXX 0600 06 - Manufactured during the 06th week of the year
XXXXXXXX 0604 04 - Manufactured during 2004

The Tire Identification Code for tires produced prior to 2000 was based on the assumption that no tire would be in service for ten years. They were required to provided the same information, with the week and year the tire was built contained in the last three digits. The 2 digits used to identify the week a tire was manufactured immediately preceded a single digit used to identify the year.

For example, if the Tire Identification Code on a tire reads:
XXXXXXXX 0680
XXXXXXXX 0600 06 - Manufactured during the 06th week of the year
XXXXXXXX 0680 8 - Manufactured during the 8th year of the decade

While the previous serial number format identified that a tire was built in the 8th year of a decade, there was no universal identifier that confirmed which decade (tires produced in the 1990s may have a small triangle following the Tire Identification Code to identify the decade). The Tire Identification Code format used since 2000 accurately confirms the year.

And finally, hold on to your sales receipts. Most tire manufacturer's warranties cover their tires for four years from the date of purchase, or five years from the week the tires were manufactured. So if you purchase new tires that were manufactured exactly two years ago they will be covered for a total of six years (four years from the date of purchase) as long as you have your receipt. If you lose your receipt, your tires' warranty coverage will end five years from week the tire was produced (resulting in the tire manufacturer's warranty coverage ending only three years from the date of purchase in this example).

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wrenched said:
... The U.S. Department of Transportation (DOT) National Highway Traffic Safety Administration (NHTSA) requires that Tire Identification Code be a combination of eleven or twelve letters and numbers that identify the manufacturing location, tire size, manufacturer's code, and week and year the tire was manufactured.

Today, the week and year the tire was manufactured is contained in the last four digits of the serial number, with the 2 digits used to identify the week a tire was manufactured immediately preceding the 2 digits used to identify the year.

Examples of tires manufactured since 2000 with this Tire Identification Code format:
XXXXXXXX 0600
XXXXXXXX 0600 06 - Manufactured during the 06th week of the year
XXXXXXXX 0600 00 - Manufactured during 2000

And
XXXXXXXX 0604
XXXXXXXX 0600 06 - Manufactured during the 06th week of the year
XXXXXXXX 0604 04 - Manufactured during 2004

The Tire Identification Code for tires produced prior to 2000 was based on the assumption that no tire would be in service for ten years. They were required to provided the same information, with the week and year the tire was built contained in the last three digits. The 2 digits used to identify the week a tire was manufactured immediately preceded a single digit used to identify the year.

For example, if the Tire Identification Code on a tire reads:
XXXXXXXX 0680
XXXXXXXX 0600 06 - Manufactured during the 06th week of the year
XXXXXXXX 0680 8 - Manufactured during the 8th year of the decade
Wrenched-
Would you agree with the corrected information below?


Examples of tires manufactured since 2000 with this Tire Identification Code format:
(twelve letters and numbers)
XXXXXXXX 0600
XXXXXXXX 0600 --- Manufactured during the 06th week of the year
XXXXXXXX 0600 --- Manufactured during 2000

And
XXXXXXXX 0604
XXXXXXXX 0604 --- Manufactured during the 06th week of the year
XXXXXXXX 0604 --- Manufactured during 2004

------------------------------------------------------------------------------------

For example, if the Tire Identification Code on a tire reads:
(eleven letters and numbers)
XXXXXXXX 068
XXXXXXXX 068 --- Manufactured during the 06th week of the year
XXXXXXXX 068 --- Manufactured during the 8th year of the decade
Do you have a link to the original article? I'd like to see it.
 

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Discussion Starter #4
ABNS,

Let me further elaborate; The extra two digits after the vin in the article are for explanation purposes only and are not actually on the tire.

On the other hand there is a mysterious -0- that appeared @ the end of the vin in the section that explains how to read tires that were mfg pre-2000. It should not be there as you can see in the link to the original article. But, as mentioned above the extra digits that are shown after and separated from the vin are for explanation purposes only and are not actually on the tire.

OKAY?
 
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