Goodyear Wide Tread GT E70-15 question
 

First pic is of a known orig. 69 Z28 tire.It says "Nylon cord" https://www.yenko.net/attachments/136589-P1010037.JPG

Re: Goodyear Wide Tread GT E70-15 question
 

Second pic is of a repo tire. It says "Polyester cord" https://www.yenko.net/attachments/136591-P1010044.JPG

Re: Goodyear Wide Tread GT E70-15 question
 

Third pic is a tire that is supposed to be orig. It is on my Z28 and has been there for 18 years. It is supposedly a orig. tire and not a repo. It says "Vytacord Polyester cord".. Any info or opinions ? https://www.yenko.net/attachments/136593-P1010042.JPG

Re: Goodyear Wide Tread GT E70-15 question
 

Does it show "Made in the USA" anywhere on it?
I found this under GoodYear Tire History:

"1962 New chemical plant started in Le Havre, France....Vytacord polyester cord announced....Research scientists discovered sprayable polyurethane rubber....Goodyear Aircraft awarded new government contracts, including one for development of high resolution radar for world's fastest fighter plane....Super Single tire and rim announced as replacement for duals on trucks....Goodyear racing tires used on more winning stock and sports cars than any other brand."

Re: Goodyear Wide Tread GT E70-15 question
 

What are the build date codes on the tires? Those numbers are melted into the sidewall near the bead during the curing process.

General question: Do all the repo's tires have current dates to comply with DOT regs.?

Mike

Re: Goodyear Wide Tread GT E70-15 question
 

Yes they say made in USA

Re: Goodyear Wide Tread GT E70-15 question
 

Build date on the nylon cord tire. https://www.yenko.net/attachments/136675-P1010046.JPG

Re: Goodyear Wide Tread GT E70-15 question
 

Build date on Vytacord polyester cord. https://www.yenko.net/attachments/136676-P1010055.JPG

Re: Goodyear Wide Tread GT E70-15 question
 

NOS Nylon cord tire https://www.yenko.net/attachments/136677-P1010050.JPG

Re: Goodyear Wide Tread GT E70-15 question
 

4 30 https://www.yenko.net/attachments/136678-P1010049.JPG

Re: Goodyear Wide Tread GT E70-15 question
 

date https://www.yenko.net/attachments/136679-P1010047.JPG

Re: Goodyear Wide Tread GT E70-15 question
 

DOT Number
All tires sold in Canada must have the "DOT" ((Department of Transportation), or tire identification number, moulded into the sidewall. Our tire has a DOT number of GHYT 4501. The first two characters after DOT indicate the manufacturer; the second two characters indicate the plant where the tire was manufactured.

Next you may see an optional string of three to four characters. Our example does not include this code. Most manufacturers use these to record company specific information about the tire, and, if necessary, use them as a guide when issuing product recalls. Because they are company specific, these codes are not standardized and are meaningful only to the manufacturer.

The last three or four digits give the date the tire was made. For all tires built after 1999, this will be a four-digit number with the first two digits giving the week number, and the last two giving the year. For many tires built previous to 2000, the date indicator will consist of three digits, the first two giving the week number and the last giving the last digit of the year. In our example tire, the last four digits of the DOT code are 4501, so our tire was made during the 45th week of 2001.

Re: Goodyear Wide Tread GT E70-15 question
 

From a 69 Corvette "Stingray Guidebook" by Rick Bizzoco.
UY05D81 U=1969 (year of production, Y=May, O= Goodyear (Manufacturer), 5=Gadsden,AL (Location of Plant),D8 (these two positions are noted as "size of tire" but no chart was avaiable, 1 ("type of tire" again unknown).

TCO551D T=1968, C=Sept, O=Goodyear, 5=Gadsen, 51=unknown, D=unknown.

MDUY DJA162 M=Goodyear produced domestically D=Plant code(no chart), UY=tire size (no chart), DJ=tire type (no chart), A=Internal use code(optional), 16=week of production, 2=year of production (1972,1982??) Note: "a new DOT code initiated after May 22, 1971, this was a 10 character code".

Charlie, hope this helps....Alec

Re: Goodyear Wide Tread GT E70-15 question
 

Thanks..so it sounds like the Vytacord polyester cord tires were probably made in 1972. Did they still make Wide Tread Gt's in 1982 ?

Re: Goodyear Wide Tread GT E70-15 question
 

Not sure what the question is but.....

* E70 x 15 on a '69 Z doesn't sound right to me. Maybe I'm missing something with the title in your post. I usually associate this uncommon size to the Chrysler line for Dodge Demon / Plymouth Duster, back around this timeframe.

* Tire companies were going through lots of changes in late 60's into early 70's moving from nylon to polyester to fiberglass or a combo of each. Each material component stayed in most tire mfg.s lines for quite awhile. Nylon usually = affordable, polyester = comfortable ride, fiberglas belted = best mileage.

* Terms such as Vytacord, Polyglas, Supertread, Custom Cushion, were all brand names for each companies version of some of these compounds used in the tires. They all touted a different twist but it boiled down to nylon, rayon, polyester, fiberglass.

* Some of the RPO options in '69 show that you could get a 2 ply tire or the "new" fiberglass tires. The 2 ply might have been either all nylon or all polyester or 1 ply of each I don't know. All nylon tires were fast moving the way of the dinosaur at this point.

Don't know if this helps or not.

Re: Goodyear Wide Tread GT E70-15 question
 

E70-15 wide tread GT is probably the most common of 69 Z28 tires. E70-15 was the designated size for a 69 Z28.

Re: Goodyear Wide Tread GT E70-15 question
 

I thought all the 69 Z/28's came with E70-15, correct? Also all the 9737 COPO cars? I guess some had Firestones, but I have never seen them, only the Goodyears.

Back to dates. Now I am confused. I have an early Wide Tread GT 4 ply Nylon tire that I always thought was the original spare on my car. It has only been on the ground once or twice. Date code UFO5C23. I was told by someone on this board that the tire was a mid 70's date. Does the "U" indicate 1969 manufacture? What month would the F indicate? How did "C" come to be September?

I would post a pic, but one of my kids took my digital camera on vacation.

Lynn

Re: Goodyear Wide Tread GT E70-15 question
 

I have a Vytacord WTGT that is being used as a spare for a 68Z. I did research on it some time ago and concluded that it was not the original tire from 68. I seem to remember that the Vytacord was a very early replacement tire. I would be happy to dig out the date code if it helps.

Re: Goodyear Wide Tread GT E70-15 question
 

So what does Date code UFO5C23 translate to?

Lynn

Re: Goodyear Wide Tread GT E70-15 question
 

Who knew decoding the tires would so complicated?

I do some work in a Goodyear plant and the white numbers on the tread are their part numbers used when assembling the tires. You may be suprised by how many "parts" are used to make a tire. Back in the day all tires were hand assembled. After they were assembled they were cooked in the mold to valcanize the rubber together. Heat will take a tire back apart, that why you see treads of truck tires on the highway.

The date codes were screwed into the mold every day just like the casting numbers on engines.

Mike

Re: Goodyear Wide Tread GT E70-15 question
 

U=1969 F=march O=goodyear 5=gadsden,AL C2=unknown, 3=unknown
Hope that helps...alec

Re: Goodyear Wide Tread GT E70-15 question
 

Thanks Alec. I guess this really is my original spare. My car is 08A.

BTW, is there a site with the goodyear date codes?

Thanks again. Car guys really are the best.

Lynn

Re: Goodyear Wide Tread GT E70-15 question
 

i got this info from a 69 corvette reference book, "1969 Stingray Guidebook" by rick bizzoco....a guy here in town sells them, it was expensive but i felt not knowing this stuff is more costly https://www.yenko.net/ubbthreads/imag...ins/3gears.gif no sweat in the info, thats what were here for...each other

Re: Goodyear Wide Tread GT E70-15 question
 

Charley:
I'm almost certain that is 1972. They were not making the Wide Tread GT or the Polyglas in '82 (at least in the small white letters). I bought an NOS F70-14 Polyglas in about 1979 (still have the receipt) from a local Goodyear store by luck. They checked other Iowa stores to find inventory since it was discontinued and none was found.
Dave

Re: Goodyear Wide Tread GT E70-15 question
 

Charlie / Lynn,
Do those 69 tires have DOT on the firewall?

I have a Goodyear with Nylon and DOT, date is JS05B74.
Alec, can you decode this one too? https://www.yenko.net/ubbthreads/imag...lins/smile.gif

Thanks!

Re: Goodyear Wide Tread GT E70-15 question
 

Kurt,
Your tire date is:
J- 1969
S- April
05- Gadsen Plant
Source: Greg Kwiatkowski, Daimler/Chrysler

Mark

Re: Goodyear Wide Tread GT E70-15 question
 

[ QUOTE ]
Charlie / Lynn,
Do those 69 tires have DOT on the firewall?

I have a Goodyear with Nylon and DOT, date is JS05B74.
Alec, can you decode this one too? https://www.yenko.net/ubbthreads/imag...lins/smile.gif

Thanks!

[/ QUOTE ]

Hi Kurt:

I assume you mean "sidewall" instead of firewall. Guess you answer so many questions about trim tags on firewalls, that your fingers just went to the "firewall" keys.

Yes, mine has DOT on the sidewall. I know some guys have said that none of the original nylon cord tires have DOT on the sidewall, but I think that they started in 1969, possibly in preparation for the 70 model year. Jerry McNiesh might know as he said something about bonus points being awarded for original nylon cord tires.

Mark (camaromb) you stated:

Kurt,
Your tire date is:
J- 1969
S- April
05- Gadsen Plant
Source: Greg Kwiatkowski, Daimler/Chrysler

Mark

How can J = 1969 for Kurt, when Alec says U = 1969? See the post above. I am not arguing, only seeking clarification. https://www.yenko.net/ubbthreads/imag...lins/dunno.gif At first I thought maybe different plants used different date codes, but apparently both Kurt's and mine were from the Gadsen plant.

My tire was in the trunk when I bought the car in 1976. My brother bought the car in 1975, and he did not buy any tires for it. It had mismatched tires on the ground, and only 1 YH ralley wheel on the ground, so I have a hard time believing someone would have bought a correct replacement tire for the spare when the ones on the ground weren't wide tread GT's. Although my car only had about 25 or 26000 miles on it, it was "rode hard and put up wet" on a regular basis, with no thought for originality, i.e. aftermarket manifold and carb, accell ignition, wrong heads, headers, no smog etc.

Anyone who can point us to some definitive literature on the early nylon Wide Tread GT's would be a hero, https://www.yenko.net/ubbthreads/imag...ns/worship.gif, at least for 15 min.

Lynn

Re: Goodyear Wide Tread GT E70-15 question
 

UFO5C23

U= 1969, F= December, O=Goodyear, 5=Gadsen, C2unknown, 3=unknown

Re: Goodyear Wide Tread GT E70-15 question
 

[ QUOTE ]
UFO5C23

U= 1969, F= December, O=Goodyear, 5=Gadsen, C2unknown, 3=unknown

[/ QUOTE ]

Alec says F = May

Jonesy says F = December

Alec says U = 69

Mark says J = 69

I think the only thing everyone agrees on is that:

O = Gadsen plant.

Surely there is a definitive source on this stuff. Does the Goodyear website offer any help?

Anyone have the judging manual for Camaros? I would assume it they give bonus points for original Nylon cord tires, there is some way to determine originality other than the word "Nylon" on the sidewall. Do any of the reproductions have Nylon on the sidewall?

I am going to check out Goodyear. Will let you know if I find anything.

Lynn

Re: Goodyear Wide Tread GT E70-15 question
 

Nothing on the Goodyear website, but I just sent them a letter. Will let you know what I find out.

Lynn

Re: Goodyear Wide Tread GT E70-15 question
 

My original spare.

http://img.photobucket.com/albums/v3...9-3974_IMG.jpg

http://img.photobucket.com/albums/v3...-3974_IMG2.jpg

Re: Goodyear Wide Tread GT E70-15 question
 

Darren:

I notice yours has DOT on the sidewall. If you are absolutley certain that this is an original, it dispells the myth that no 69 tires had the DOT embossed on the side.

When was your car built?

Lynn

Re: Goodyear Wide Tread GT E70-15 question
 

My orig ones have DOT also

Re: Goodyear Wide Tread GT E70-15 question
 

Thanks Mark! Hmm, that tire was on a 2/28 YH wheel.

Thanks on the DOT part. I wasn't sure it was on original tires til now.

Maybe Alec can scan the decode page and post it. https://www.yenko.net/ubbthreads/imag...lins/smile.gif

Re: Goodyear Wide Tread GT E70-15 question
 

2nd week Feb 69 is the build date on my car. I'll pull the tire out of the trunk later tonight and photo the YH stamp and date.

Re: Goodyear Wide Tread GT E70-15 question
 

Quoting from a recent post on the NCRS Tech Board:

"After 1968, tires were required to have DOT source code info molded into the sidewall. For the first several years, the code/sequence was manufacturer-proprietary, but starting in 1971, the sequence was standardized into a 10-digit code with the last three digits representing the month/year of manufacture. When the century rolled over, the sequence was extended to eleven digits, with the last four indicating month/year".

Re: Goodyear Wide Tread GT E70-15 question
 

[ QUOTE ]
Quoting from a recent post on the NCRS Tech Board:

"After 1968, tires were required to have DOT source code info molded into the sidewall. For the first several years, the code/sequence was manufacturer-proprietary, but starting in 1971, the sequence was standardized into a 10-digit code with the last three digits representing the month/year of manufacture. When the century rolled over, the sequence was extended to eleven digits, with the last four indicating month/year".

[/ QUOTE ]

I have 2 NON-DOT original spares for my 1966 Vettes (Coupe and Convertible). The original Firestone Deluxe Champion Super Belted I have for the 1970 Camaro has a DOT Stamping. So it fits the trend.

Re: Goodyear Wide Tread GT E70-15 question
 

So then what is this date ? My thought was this was a 69 tire but the letter is not one of the two listed as 69's. https://www.yenko.net/attachments/199212-tn_P1010009.JPG