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What was the correct size 15 X 6 rallys?? Can you get a 15 X 7 rally underneath the fender lip?? And one last question where would you go for a info on the codes for rally rims?? Thanks.
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Re: Rim width for a 1967
I would think you can use 15x7 nut sure. but 15x6 were stock, and they all had DC stamped by the vavle stem. -
Thanks Keith !!!!! *NM*
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Re: Rim width for a 1967
Larry,
A 15x7 wheel on a '67 is a very chancy proposition at best. While some have made it work, I have seen more that have not. There is a lot of variation from car to car. Best bet is to stay with a 6" rim and 215 section tire. If you have a driver that would gladly suffer t******* down the inner lip, your odds are better. If the thought of a cracked fender makes your heart skip a beat, stick with the stock wheel.Comment
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Re: Rim width for a 1967
Here are the numbers. The '67 wheel has +.06" offset and the '67 Corvette wheel has -0.28" offset, so the entire wheel is pushed out .34" from the offset and another 0.5" from the added width, so the outside face of the '67 wheel is about 0.84" further outboard than the '67 wheel.
Guess what the answer is?
Of course, you COULD run a 225/30R-15 tire, if such was available.
Now wouldn't that look cool!
DukeComment
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Re: Rim width for a 1967
Larry,
--------If you put a 68 Corvette 7 inch wheel on you will have problems. However, 1970/71/72 Monte Carlos had a 15/7 rim that had the extra inch on the inside. I have used these for years on the back of mid-years and there are no clearance problems either on the inside or the outside. There is an added bonus as well; The standard 67 Corvette trim ring will have no gap along the inside edge and therefore will appear absolutely correct. Hope this helps!!!.........Bill SComment
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Re: Rim width for a 1967
Bill, I have seen the Monte Carlo FW 15x7 rims on a '63 that hit the spring when off the ground and cleared by a gnat's whisker when rolling. It eventually got 1/8" spacers to get clearance.Comment
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Re: Rim width for a 1967
I assume that second '67 wheel is a '68 wheel. And the third one, too?
AG 15x7 3.5 - .28 = 3.22 backspacing Vette
AZ 15x8 4.0 - .50 = 3.50 backspacing Vette
YH/FW 15x7 3.5 + .30 = 3.80 backspacing MC, Z28
DC/FI 15x6 3.0 + .06 = 3.06 backspacing Vette
This means the stock '67 DC wheel sticks out from the plane of the rotor hub 2.94", the '68 AG wheel sticks out 3.78", the '69-up AZ wheel sticks out 4.50", and the FW wheel sticks out 3.20".
The Monte Carlo/Z28 YH/FW rim is only 1/4 inch further out than the stock '67.
I guess the answer is to put an extra donut under the spring on the spring bolts to lift the rear?
Or add the vintage racing fenders that many are using, those "stock" fenders that magically "Harry Potter-style" insert an extra 2 inches of room instead what looks stock outside?Comment
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Re: Rim width for a 1967
The plane of the wheel mounting flange is about 0.3" further outboard on disk brake models than drum brake models (This is evident from the track dimension specification for '64 and '65 models, which use that same +0.44" offset base wheels.) , so maybe the Monte Carlo wheels would be okay on a disk brake car (at least on the inside, but now it's pushed back outboard because of the greater mounting flange plane distance from centerline, so it comes down to tire design), but I would imagine the reason why Corvette 7" Rallys have the unique offset is to BE SURE that there is enough spring clearance, considering the worst case body/chassis tolerance stackup, plus about another quarter inch to be sure.
The lower offset will also cause tire/frame interference at about a quarter turn less than full steering lock, but this shouldn't be a major problem since this amount of steering lock is only used at parking lot speed.
DukeComment
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Re: Rim width for a 1967
--------Thanks, Mark!!! I dont fool with too many drum brake cars and hadnt thought about a difference between disc and drum............Bill SComment
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Re: Rim width for a 1967
One interesting item of the drum brake cars is to run a 14 inch rim. You don't run across that sort of thing much anymore, as most go to 16", 17", and up on cars today.
But in the '60s and '70s, it was not uncommon to find 14 inch mags on '63 and '64 Corvettes. The shorter wheel/tire allows a wider tire that sits below the lip instead of in it.Comment
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Thanks, Duke, I had forgotten about
the difference in the plane of the drums versus the disc brakes. You had posted that about a year or so ago.
I have seen the Monte Carlo FW Rally wheels on disc brake midyears and on '68 and '69s with no problems. However, the couple I have seen on '63s or '64s had a spacer on the rear ones.
Considering the Sting Ray body was based on a race car, it is a shame they didn't design the wheelwell for larger tires. They knew they were coming, and since Corvette was as much of a performance car as it is, owners would no doubt retrofit wider tires for enhanced performance.Comment
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Re: Thanks, Duke, I had forgotten about
Tire width, including racing tires, didn't start to grow until about 1965. The original Stingray was designed circa 1958.
DukeComment
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Re: Thanks, Duke, I had forgotten about
Growth of tire sizes on the street didn't begin until close to then, but in racing, they began much earlier.
In this picture of the Stingray, you see the fenders allowed for a lot of tire room. I'm not sure, but it looks like a 5" Halibrand on front and a 6" on rear.
If you make a trip to Darlington to their museum, you will find very large and fat tires on some very old cars.
While building the Grand Sports in 1962, they changed the fender to include much large tires. However, by 1964, even that wasn't enough and they had to install flares as shown in these 1964 Sebring pictures.
Many sports car racers clung to the idea that a skinny tire gave better performance, but then, sports car drivers clung to a lot of strange ideas that NASCAR and engineers were disproving and going in the opposite way to speed.
More Stingray pictures at VIR - 1960
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