CrCrzy

I have been looking through the search feature to see if anyone has done this. So far no clear answers. I have seen posts where people say the 1968 Corvette Rally wheel is 3.5 inch and others say it is 4 inch backspacing. I am assuming this descrepany is in how different people measure the wheel. Mounting flange to inside wheel flange at tire mounting bead. Versus Mounting flange to outside most point of rim.

I am trying to figure out if this wheel will fit on a 1960 Corvette with stock rear suspension. The front has an ECI disc brake set-up. I have seen postings with torque thrust or crager wheels installed on C1's. These posting state their backspacing but I am not sure how they are measuring.

Can anyone with a 15x7 wheel tell me what backspacing they have and how they measured it? And what tires they are running? It would be perfect if someone had 15x7 Corvette Rally's on C1 with pictures.

Thank you in advance.

mashinter

Here are '68 15X7 with F60-15 in 1977. No broken fiberglass.



I prefer to use offset, but on a bare rim, I get 3-3/4 from a straight-edge across the back of the wheel to the mounting surface.

Bill

CrCrzy

Awesome picture. Can anyone tell me what an F60-15 would be in today's tires? Thank you for the picture and the information.

mashinter

I still have an F60-15 on the front of the '59. (Long term storage..)
It measures 9-1/8 section width (not tread width) and 26-3/4 diameter.

The Tire and Rim Association Handbook has the following:
225/60-15 is 8.98 by 25.63
235/60-15 is 9.45 by 26.10

I'd go with the 225/60-15

Bill

CrCrzy

Thank you Bill. Do you happen to have a side picture of your car? I would like to see how that tire fills the wheel wells. Does your hand book tell you how tall a 225/65-15 would be? Thank you again.

DZAUTO

I have never made a side by side comparrison, but I would guess that the 68 15x7 Corvette Ralley wheels and the 15x7 Ralley wheels used in later years, for example the mid-70s Monte Carlos, etc, are the same wheel.
This said, one of my very good friends has put 15x7 Ralleys (from a mid-70s Chevy) on his 62 Vette with ZERO issues whatsoever!
I loaned him one of my original 56 wheels (with nubs for retention of the full wheel covers) and he took that and his 4 Ralleys to a welder and had beads welded to the Ralleys in the same location as on original wheels so that he could install his original 62 wheel covers. The welded beads turned out to be a fraction larger, thus, the 62 wheel covers fit REAL good. The tires are 225/75R15 white wall and the combo looks MUCH better than "correct" skinny wheels/tires.

Tom Parsons

misfit1

Here is what I have on mine.





I went with the Monte Carlo wheels. They are 15x7, with a 4” offset (pretty sure). The fronts are 225/60/15 and the rears are 235/70/15. The backs are a little snug, mainly because I have rear disks and it pushes my rims out slightly farther then the drum would have. Plus the fact that the car sits over the wheels and there is little room for movement, but they don’t rub. The fronts have plenty of room, because I have the Jim Meyer narrow front end. I don’t know if they still give you that option.

Dave

CrCrzy

Thank you Tom and Dave.

Tom,
I read through some previous posts and saw that you have 225/75 tires on your car as well. Do you have a side photo you could show or a picture similar to what Dave took to show how your wheel and tire combo fill the wheel well? I have heard that a 61 has more tire room, if that is true your 56 would be a closer match to my 1960 Corvette. Just for standardization purposes, Bill measured his 1968 Corvette Rally from the mounting surface to a flat edge stretched across the outside most point of the rim and came up with 3-3/4". Do you know what your friend's wheel backspacking would be if measured accordingly?

Dave,
I love how the 235/70's look in the rear. Do you know what your wheel backspacing would be if you measured them as described above? Mounting surface to outside most point of the wheel? Was there any particular reason you chose to install 225/60's up front? I believe the Meyer front end is 1" narrower than the originals.

Thank you,

john5801

jupitor 60
i had 15x 7's- 235-60's R15's with 4 1/2 " backspacing all around on my '58.the clearance in the rear was 1/4 ' tire to the spring. on the front i had the same wheels/tires and disc brakes ,, and no problems ..

i now run 15 x 6's -(67 ralleys) with 3 1/2 " backspacing. 215-65-R 15's on the fromt-with disc brakes, and 235-60-r 15's on the rear and no problems- and more clearance between the tire and rear spring.. (and i feel better about that).
tires are bfg-blackwall radial's. (white letters blackened and inside.)

i also put my original full hub cap's on the car..

measurement is from the inside-a stick -ruler- on the rim -"inner shelf" and down to the center of the rim.. you can't go wrong.
hope this help's.

Kerrmudgeon

68 7" ralleys behind 66 caps on my 62,front and rear no sweat, 205-75r tires. Should be the same for a 60. Hope this helps.
_________________________

CrCrzy

Thank you for all the replies.

I think I will definitly be safe with the 225/75's all around.

I really do love the look of the 235/70's on Dave's car. Does anyone with a 1956 to 1960 Corvette have those tires on their car with 15x7 wheels with 3-3/4" bs to outside wheel lip?

Thanks again for all the help. I have ordered a set of the 1968 Corvette Rally's from Ecklers. Now just need tires.

misfit1

I have an extra rally rim in the garage, so I went out and measured 3 ¾. The reason I went with the different size tires was cost. I didn’t plan of keeping these too long and I got a great deal on the tires.

mashinter

This picture is the best I've got for that. Keep in mind that this car is on the competition springs; it is "in the weeds."

The book has a 215/65-15 at 26.02 and a 235/65-15 at 27.05.

The Monte Carlo wheels (15X7) have more backspace (4-1/4) than the '68 Vette wheels (3-3/4). I use the Monte Carlos on the front of my '65. With the '68 wheels, the tires would rub on the fender. I like the looks of the '68 better, but hate the look of a busted fender. I had no such problem with the '68 wheels on the front of the '59.

CrCrzy

Dave,
Thank you for measuring your wheel for me. Which method did you use to come up with 3-3/4"? From what Bill (Mashinter) says 3-3/4" from mounting to flat edge stretched across rim would indicate 1968 Corvette Rally.

Bill,
Are 1968 Corvette Rally's on all 4 corners of your Corvette? I do not think there will be a problem with the front wheels. It starts to get tight at the back wheels. We used to run 1969 up 15x8 Corvette Rally's and the rears were more of an issue than the fronts.

I was at a friend's house last night helping him with a 1969 Camaro we are rebuilding for his son. They have 15x7 Rally's with 235/60's. Looking at it makes me think they will not be tall enough to fill the wheel wells on my 1960 Corvette. Width looks fine but I think height will be an issue. The front of the car has new springs and the rear's have been re-arched. Right now I am thinking 225/70 or 225/75. Still would love to see someone with a 1956-1960 Corvette with 3-3/4" backspacing measure Mashinter's way with a 235/70?

Thanks again for all the help.

misfit1

I know the wheels on my car right now are the Monte Carlo wheels. I’ll have to take the beauty ring off to measure the offset. But, I remembered the extra rim, I gave you the measurement from, is from a 1960’s or 70’s Camaro. So if the numbers are different, I’m sorry for making things more confusing.

Dave

mashinter

Yes. The '59 above is all '68 Corvette 15X7. You can see from my picture that 15X8 wheels, which stick out about 3/4 inch more, would require me to adopt a ghetto stance for the '59. I do have a pair of air shocks...

blubu

68s are one year only with the shallow backspace I assume to allow the fat rings.
The later style big trim rings as the offset is 4 inches
A seven on a carlo or others has a BS of 4 with three offset
All other later than 68 were 4x4 even space on both sides

Old Blazer

Hope this link works. It should take you to an older wheel thread. http://forums.corvetteforum.com/c1-a...estions-2.html
My car has the 15x7 Monte Carlo Rallye wheels, 4-3/8" or 4-1/2" backspacing depending on how you measure them. No problems with rubbing anywhere.

JohnZ

Nope. '69-'82 "AZ" 15x8 Corvette rally wheels had -0.5" offset.