1968 Spare Tire Rim Size Same?
My PO put a 14" tire and rim in the spare tire holder which of course does not fit my 1968 car. Fortunately I found out before I needed it. I researched and believe the stock 1968 rim size was a 15 x 7, 5 x 4.75 (120.65mm) bolt pattern with -.28" (-7mm) offset with a 3.22" backspacing. My question is before I buy a new rim....is the spare rim size the same as the other rims on the car?
YEAR, MODEL, WHEEL LOCATION, WHEEL SIZE, OFFSET, BACKSPACING, TIRE SIZE 1968, Corvette, Rally Front/Rear, 15”x 7”, ( - ) 7mm, 3.22”, F70 x 15 Redvette2 |
My 6t8s previous owner had put 15x8s on, but the spare still was a 15x7. T
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Yes, the spare is the same size and specs as the other 4 wheels.
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Redvette2, the stock '68 rally wheel is typically described as; AG 15" X 7" wide with backspacing of 3 & 3/4"
Good luck... GUSTO |
Yes I confused backspacing with offset. Found a site with more information also.
Thanks, Redvette2 |
Originally Posted by Redvette2
(Post 1599321877)
Yes I confused backspacing with offset. Found a site with more information also.
Thanks, Redvette2 I have a '73 and mounted two different, brand new, 225/70-R15 radials on a Corvette rally wheel (15" X 8") and could not get either of them to fit into the spare tire carrier and close it. The 225/70-15 is supposed to be the equivalent of the standard GR70-15's that came on the '73. I had to drop down a size to get a tire to fit in there. Good luck... GUSTO |
After much thought and digesting all the information, I decided to go with a 205/65 R15 tire on a 15 x 7 rim with 6mm offset as the spare. The tire is the same diameter as the 225/60 R15 BFG's tires I just put on the rolling wheels. I will update the post as to how well it fit soon as I put the spare on.
Redvette2 |
Originally Posted by Redvette2
(Post 1599324808)
After much thought and digesting all the information, I decided to go with a 205/65 R15 tire on a 15 x 7 rim with 6mm offset as the spare. The tire is the same diameter as the 225/60 R15 BFG's tires I just put on the rolling wheels. I will update the post as to how well it fit soon as I put the spare on.
Redvette2 The original tires on the '68 were F70-15's which are nominally 27" in diameter. The 225/60-15 is 25.6" while the 225/70-15 is 27.4", closer to the original size tire. Just curious... Again, good luck... GUSTO |
Originally Posted by GUSTO14
(Post 1599325383)
John, did you mean to say 225/70-15, or 225/60-15?
The original tires on the '68 were F70-15's which are nominally 27" in diameter. The 225/60-15 is 25.6" while the 225/70-15 is 27.4", closer to the original size tire. Just curious... Again, good luck... GUSTO Redvette 2 https://cimg5.ibsrv.net/gimg/www.cor...576b9926c7.png 1968 Corvette Tire Size Chart |
Originally Posted by Redvette2
(Post 1599325654)
No....I did put on 225/60 R15's. The 70 series was too big in diameter (27.40" vs. stock 26.30") and 225 was not available in a 65 profile. I wanted a smaller diameter tire anyway as my car is geared really tall. Fortunately this size was still good on the freeway. Here is my chart with the sizes.
Redvette 2 Based on your numbers however, I see why you chose the tire you did. :thumbs: GUSTO |
I'm curious to hear how it fits in the spare tire holder. I just purchased a tire for my spare tire holder and it didn't fit. I'm using a factory rally wheel and would like a tire around 26" in diameter. Very much like your going to test out.
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Originally Posted by GUSTO14
(Post 1599327746)
John, I was just wondering where you got the diameter for an F70/15 as 26.30 inches. Everything I've found shows the F70/15 as just over 27" (27.09-27.10) back in the day.
Based on your numbers however, I see why you chose the tire you did. :thumbs: GUSTO Redvette2 |
Originally Posted by gunrunr
(Post 1599327844)
I'm curious to hear how it fits in the spare tire holder. I just purchased a tire for my spare tire holder and it didn't fit. I'm using a factory rally wheel and would like a tire around 26" in diameter. Very much like your going to test out.
Redvette2 |
The spare tub is adjustable for tire width. I believe that i's the same hardware as came on later C3's. You may have to extend the hangers, but I doubt it.
If you intent to actually use the spare if you experience a flat or damaged tire, I would recommend putting the same size wheel and tire as you have on the car. If you just want to have a 'correct looking' spare tire, get a '68 rim (7" width) and an F70-15 tire. There are lots of them folks already have in their spare tubs (originals that never hit the ground). I have one in mine. It's a Goodyear tire |
Originally Posted by 7T1vette
(Post 1599330847)
The spare tub is adjustable for tire width. I believe that i's the same hardware as came on later C3's. You may have to extend the hangers, but I doubt it.
If you intent to actually use the spare if you experience a flat or damaged tire, I would recommend putting the same size wheel and tire as you have on the car. If you just want to have a 'correct looking' spare tire, get a '68 rim (7" width) and an F70-15 tire. There are lots of them folks already have in their spare tubs (originals that never hit the ground). I have one in mine. It's a Goodyear tire Redvette2 |
Well the plot thickens...on another forum post here today an original Goodyear Wide Tread F70-15 spare tire was measured to be 25 3/4 inches in diameter! Doesn't really match any of the suggested metric sizes. I think I am overthinking all this. ;)
Redvette2 |
Well I put a 205/70R15 in the spare tire carrier and it closed nicely. With that headache down, its off to the next one.
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15 x7.0 x2!
Originally Posted by GUSTO14
(Post 1599320752)
Redvette2, the stock '68 rally wheel is typically described as; AG 15" X 7" wide with backspacing of 3 & 3/4"
Good luck... GUSTO |
Originally Posted by gunrunr
(Post 1599338429)
Well I put a 205/70R15 in the spare tire carrier and it closed nicely. With that headache down, its off to the next one.
Redvette2 |
This worked for me....
Originally Posted by gunrunr
(Post 1599327844)
I'm curious to hear how it fits in the spare tire holder. I just purchased a tire for my spare tire holder and it didn't fit. I'm using a factory rally wheel and would like a tire around 26" in diameter. Very much like your going to test out.
Tire = Sentury Radial Touring, 205/65 R15 XL BSW $38.00 Steel Rim = Unique 144, P/N = 15X7 5-114.30/120.65 6 CSCHXX $64.00 Discount Tire out the door with taxes, mount and balance but no extended warranty = $133.89 Lesson learned...the formulas and website numbers do not match well with the actuals for the tires. Same sizes vary between models and manufacturers. Redvette2 https://cimg1.ibsrv.net/gimg/www.cor...307236f852.jpg https://cimg9.ibsrv.net/gimg/www.cor...f8ca967df3.jpg |
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