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  #11  
Old 08-30-2020, 06:43 PM
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DOT tire marking started in 68 according to John Z @ CRG,

See reply 17 by John

http://www.camaros.org/forum/index.p...1589#msg101589
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  #12  
Old 08-30-2020, 08:02 PM
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Interesting Mike - That opens the door for these tires being 1969 vintage. Since the universal code of 4 characters followed by 6 characters went in effect in 1973, my tires don't conform to that system - they are 4 characters followed by 7 characters. So, maybe Goodyear only coding prior to 1973?
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Old 08-31-2020, 12:37 PM
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I believe the Goodyear codes are known. Check with Kelsey Tire 573) 346-2506
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  #14  
Old 08-31-2020, 01:11 PM
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Looks like May 1971

https://ecfr.federalregister.gov/cur...ter-V/part-574
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Old 08-31-2020, 02:56 PM
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Quote:
Originally Posted by bergy View Post
Interesting Mike - That opens the door for these tires being 1969 vintage. Since the universal code of 4 characters followed by 6 characters went in effect in 1973, my tires don't conform to that system - they are 4 characters followed by 7 characters. So, maybe Goodyear only coding prior to 1973?



After May, 1971, DOT coding format was the same for all tires. 10 digit which included (3-digit date code WWY) I believe sometime after 1978 it may have changed to 11 digit). I need to do some research to confirm...



In 2000, and (12) digits (4-digit date code -WWYY)
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  #16  
Old 08-31-2020, 03:16 PM
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Good info - when suppliers of big 3 OE tires had to indicate DOT (in the '68 model year per John Z) - they were not mandated to coincidentally add DOT to service replacement tires. So, there was a transition period between '68 and '71 (or '73 in practice) when each supplier of OE tires was mandated to add DOT, but could use their own codes for mfg/date. The universal mfg/date codes were mandated in '71 (or '73). What we're trying to establish is - whether Goodyear abandoned their old (pre '70) date code system and began a new system of their own on the OE tires between '68 and '71 (or '73).

In a nutshell - trying to figure out why the subject tires in this thread have an 8th week of year "9" manufacture date, but the mfg/date code doesn't conform to the federally mandated system post '71 (or '73). Does that imply that the tires were manufactured in 1969 (before the federal mandate went in effect)? Or, did Goodyear fail to comply with the federal system (if the date that these tires were manufactured was 1979)?

If anyone has pics of NOS G70x14 red line tires from '69 or '79 - please post them.

This may seem like a dancing on the head of a pin, but interesting (at least to me) to understand the nuances of manufacturing back then.
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  #17  
Old 08-31-2020, 03:35 PM
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Steve - If you look at the pictures of tire codes in the articles referenced in this thread - the coding format post '71 is 10 digits. Or am I incorrect?
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Old 08-31-2020, 04:14 PM
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Quote:
Originally Posted by bergy View Post
Steve - If you look at the pictures of tire codes in the articles referenced in this thread - the coding format post '71 is 10 digits. Or am I incorrect?

You are correct. May 71 To ? are 10 digit (I believe sometime after 1978, it changed to 11). Then in 2000 it changed to 12 digits.


Thanks Bergy, I will edit my previous post. I will dig for the transition date to 11 digits.
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Old 08-31-2020, 04:32 PM
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Old 08-31-2020, 04:59 PM
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Quote:
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Thanks ! I have a note with that date but finding it ... is another story.
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