Rims and Tires
Race Director
Joined: Oct 2000
Posts: 12,596
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From: Shamong, NJ
siz
I don't recall if the size is stamped on Corvette rally wheels anywhere, but if it is it's on the inside of the rim and can only be seen with the tire off. As I said in my post above, to positively identify what rally wheels are on your Corvette, you need to remove a trim ring and check the code stamped in the rim at the valve stem hole. If they are 15x7 68 rally's they will be stamped "AG", and if they're stamped "AZ" they're 15x8 69-82 rallys. Aftermarket and replacement wheels not made by GM or Kelsey-Hayes will not have an "AG" or "AZ" identification code.
The stampings on a Chevrolet rally will decode as follows:
K - Kelsey-Hayes
1 - Romulus MI plant where the rally wheels were made.
x - A number for the year made, such as "9" for 69, 79, etc or "2" for 72, 82, 92.
xx - 1-12 for the month of manufacture.
The valve stem hole is usually in this position between the month and day.
xx - 1-31 for the day of manufacture.
"AZ" - The wheel code is here in the last position. Could also be "AG", "FW", "DC", "YH", etc.
Be aware that there are also 15x7's stamped "FW", which are very common and often mistaken for 68 Corvette rallys. The "FW"s were optional on 71-77 Chevelles, El Caminos and Monte Carlos, and have the wrong backspacing to properly fit on a Corvette. There were also 15x7 rallys coded "AD" for 68 Z/28's and "YH' for 69 Z/28's. And there are about 15 or 16 more codes used for the various 14x5, 14x6, 14x7, 15x5 and 15x6 Chevy rally wheels.
The stampings on a Chevrolet rally will decode as follows:
K - Kelsey-Hayes
1 - Romulus MI plant where the rally wheels were made.
x - A number for the year made, such as "9" for 69, 79, etc or "2" for 72, 82, 92.
xx - 1-12 for the month of manufacture.
The valve stem hole is usually in this position between the month and day.
xx - 1-31 for the day of manufacture.
"AZ" - The wheel code is here in the last position. Could also be "AG", "FW", "DC", "YH", etc.
Be aware that there are also 15x7's stamped "FW", which are very common and often mistaken for 68 Corvette rallys. The "FW"s were optional on 71-77 Chevelles, El Caminos and Monte Carlos, and have the wrong backspacing to properly fit on a Corvette. There were also 15x7 rallys coded "AD" for 68 Z/28's and "YH' for 69 Z/28's. And there are about 15 or 16 more codes used for the various 14x5, 14x6, 14x7, 15x5 and 15x6 Chevy rally wheels.
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Joined: May 2025
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From: Brooklyn, Ohio
Race Director
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From: Fremont Ca
2022 C4 of the Year Finalist - Modified
Personal preference for me is a 245/60 on my 81. The 255/60 is just too big,looks like a truck tire. The 245 is perfect,it's only a very small difference in size but I can see the difference.
Pro
Joined: May 2002
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The modern direct equivalent for the F70x15's that came on your 68 is the P215/70R15, and the modern wider 60 series equivalent is the 245/60R15. The 245/60 will fit fine both front and back on standard 69-82 Corvette 15x8 ralley wheels. P225/70R15 is the modern replacement for the base radial tire that came on 73-82 Corvettes and the P255/60R15 was the factory optional tire for 78-82's. In my opinion, the slightly taller 225/70 and 255/60 visually fill the wheel opening better than the shorter 215/70 and 245/60 do.
The 255/60's will fit on your 68 when using 15x8 wheels with stock offset, though under the right conditions there is the slight possibility of interference between the 60 series tire and the forward lip of the wheel opening. When GM installed 225/60's on 78 and 79's they trimmed the wheel opening's lip in front of the tire, from the front bottom edge up about 8". I've never heard of anyone who didn't trim the lip having a problem with 255/60's on the front, but it is something to be aware of if you decide to go that way. GM did it because they had to worry about warranty claims, so it paid for them to make the effort to trim the lip.
One final thing to consider when going to a larger tire on a 68 (or 69) is that unlike 70-82 fenders that have the flare behind each wheel opening, the 68 fenders don't have these flares. 68-69 lower fenders tend to see a lot of road rash from the tires throwing stuff at them, and a wider tire can increase this, if that's a concern to you.
The 255/60's will fit on your 68 when using 15x8 wheels with stock offset, though under the right conditions there is the slight possibility of interference between the 60 series tire and the forward lip of the wheel opening. When GM installed 225/60's on 78 and 79's they trimmed the wheel opening's lip in front of the tire, from the front bottom edge up about 8". I've never heard of anyone who didn't trim the lip having a problem with 255/60's on the front, but it is something to be aware of if you decide to go that way. GM did it because they had to worry about warranty claims, so it paid for them to make the effort to trim the lip.
One final thing to consider when going to a larger tire on a 68 (or 69) is that unlike 70-82 fenders that have the flare behind each wheel opening, the 68 fenders don't have these flares. 68-69 lower fenders tend to see a lot of road rash from the tires throwing stuff at them, and a wider tire can increase this, if that's a concern to you.
To be safe the 245/60/15 tires fit fine under all conditions, and of course if going modern you can go lower and wider tire/wheel-wise as well with after market Rally styles available.
I have a 71 F41 Coupe that has rubbed with 255/60/15, and been fine with 245/60/15 and now hard to find shorter 265/50/15 (mine has OD).
Last edited by doug_dayson; May 28, 2025 at 12:46 AM.
Intermediate
Joined: May 2025
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I have a dated-matched set of 1968 15x7 Rally wheels on my 1969
I am sure this has been asked a millions times so let me be the 1million and 1.
Right now My 68 has on it factory rally 15x7, 225 15 70.
I am looking to get different rims and tires yet still keep the rallies.
My question is:
Will 15x8's fit
What back spacing will work 4.00 or 4.50, don't want sterring rub.
What tires size 225's or 235's
Thanks
Denny
Right now My 68 has on it factory rally 15x7, 225 15 70.
I am looking to get different rims and tires yet still keep the rallies.
My question is:
Will 15x8's fit
What back spacing will work 4.00 or 4.50, don't want sterring rub.
What tires size 225's or 235's
Thanks
Denny
I just realized last night that I have a set of four date-matched mid-1968 7X15 AG Rally wheels with Cooper tires on my late 1969 Corvette.
I’m going to want to sell these or trade for a set of five correct (for my car) mid-to-late 1969 (June to October) 8x15 AZ Rally wheels.
The set of matching one-year-only wheels are a rarity, but wrong for my car, unfortunately. Perhaps they’ll work as a resolution to your question?
Balloon floated!
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Cruising
Joined: Sep 2024
Posts: 10
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From: Exit 7A, New Jersey
Rims & Tires
My comment has nothing to do with your question. I did not want to repeat what everyone else has said.
I am very impressed with the picture you posted of your car and the neighborhood you live in.
It looks like everyone in your neighborhood really takes pride in keeping up their properties.
Kudos to everyone! The Vette looks great too!
I am very impressed with the picture you posted of your car and the neighborhood you live in.
It looks like everyone in your neighborhood really takes pride in keeping up their properties.
Kudos to everyone! The Vette looks great too!
Le Mans Master
Joined: Nov 2001
Posts: 8,570
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From: LONG ISLAND
2025 C3 ('68-'73) of the Year Finalist - Unmodified
2024 C3 of the Year Finalist - Unmodified
2023 C3 of the Year Finalist - Unmodified
My comment has nothing to do with your question. I did not want to repeat what everyone else has said.
I am very impressed with the picture you posted of your car and the neighborhood you live in.
It looks like everyone in your neighborhood really takes pride in keeping up their properties.
Kudos to everyone! The Vette looks great too!
I am very impressed with the picture you posted of your car and the neighborhood you live in.
It looks like everyone in your neighborhood really takes pride in keeping up their properties.
Kudos to everyone! The Vette looks great too!
But, people that own Corvette's don't live in the hood
