Tire dates ?

[Charley Lillard]

Can someone explain these dates ?

[Charley Lillard]

……

[AnthonyS]

Hi. 37th & 45th week of 1992, 1982, or even 1972 maybe.

I believe four digit dates (last two of last two of year) started in 2000.

They’re at least nearly thirty years old.

Cheers.

[Charley Lillard]

They are Goodyear Wide Tread GT. Did Goodyear continue making them after they went to Polyglas ? Repo ?

[AnthonyS]

Last photo above is 48th week of course, exact year ending in “2” still unknown.

[AnthonyS]

Made in USA or Argentina?

[Charley Lillard]

Usa

[Lee Stewart]

Goodyear Polyglas Tire Date Coding:

http://anghelrestorations.com/uploads/3/5/1/2/35122002/goodyear_polyglas_tires_v1.3.pdf

[Charley Lillard]

No tread wear indicator and no safety warning.

[Lee Stewart]

Those tires were made in or after 1971 which is when the United States Department of Transportation mandated all tire manufactures use a standardized 10 digit DOT Tire Identification Number.

Goodyear Wide Tread GT RWL tires which came on 1968 and 1969 Z/28s will not have that DOT + 10 digit number sequence

[jeffschevelle]

According to the table in the Anghel Restorations paper, the DY means 6th week of 1972

Scratch that -- that table is for an 8 digit code. Since this one is 10 digits that would not apply! Duh ...

[firstgenaddict]

That is a pre 70 Goodyear dating system. EVERY license plate on post 70 tires has all numbers on a single cavity insert. - variable data - the ones Charlie has shown have a 3 digit variability, which I believe follows the older Good Year system. How are the dates on anyone's original 69 Z tires configured?

[AnthonyS]

Here’s something from Coker:

https://www.cokertire.com/blog/tire-age

[CamaroNOS]

Correct.

Prior to 2000, three numbers were used for the DOT.

Starting with the year 2000, four numbers are used for the Date of Manufacture. The first two numbers identify the week and the last two numbers identify the year of manufacture. The other numbers and letters in the sequence identify manufacturing plant/shift/tire construction specs/etc.

Example......4201 would equate to 42 week of 2001.

Nice find Charly.

Paul

[Charley Lillard]

That is a pre 70 Goodyear dating system. EVERY license plate on post 70 tires has all numbers on a single cavity insert. - variable data - the ones Charlie has shown have a 3 digit variability, which I believe follows the older Good Year system. How are the dates on anyone's original 69 Z tires configured?
Are you saying they could be 1969 tires ?

[Lee Stewart]

Are you saying they could be 1969 tires ?

No. Because they use the DOT plus 10 digit numbering code which wasn't implemented until 1971.

What they probably are are tires manufactured by Goodyear in the 1971 - 1972 time frame.

They are not original equipment tires for a 69 Z/28. They are replacement tires that you bought at a Goodyear Tire Store when yours wore out.

[Steve Shauger]

First I'm not familiar with this type of raised letter/# and 3 digit stamping. If we were to conclude this is a 10 digit code DYLCJ6A372 then this was manufactured the 37 week of 1972. This configuration used on this tire doesn't represent the mid to late 60's dating system. The odd thing is the spare tire is correctly dated March of 69