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  #1  
Old 08-30-2012, 10:01 PM
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FETorino FETorino is offline
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Originally Posted by BBC71Nova View Post

THEY DON'T FIT! . I had thought and was led to believe that using a wheel with known size and backspace was best method of determining what size new wheels to get.

I have a set of 15" X 10" wheels with tires mounted. The wheel is listed as a 5" backspace wheel. That setup fits fine but could stand to be 1/8" further inboard.

With the new setup I went with an 18" X 11" wheel. Simple, right. Split the 1" difference in width yielding 5.5" backspace plus the extra 1/8" and voila new wheel needs to have 5 5/8th backspace to fit perfectly. NOPE. Apparently not.

I'm not sure I follow your logic here. If 5" bs is fine but it could be 1/8" more inboard then you want 5.125" bs. If you go from a 10 to an 11" width the BS doesn't change you still have only the 5.125" to work with inboard. The question is with the 10" wheel did you have the extra .875" outboard to allow for the wider width wheel? You didn't say but from your measurements I would guarantee that the wheel is hitting the tubs cuz you have .5" to much BS.
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Old 08-30-2012, 10:17 PM
BBC71Nova BBC71Nova is offline
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Originally Posted by FETorino View Post
I'm not sure I follow your logic here. If 5" bs is fine but it could be 1/8" more inboard then you want 5.125" bs. If you go from a 10 to an 11" width the BS doesn't change you still have only the 5.125" to work with inboard. The question is with the 10" wheel did you have the extra .875" outboard to allow for the wider width wheel? You didn't say but from your measurements I would guarantee that the wheel is hitting the tubs cuz you have .5" to much BS.
Sorry if it is confusing. I should have mentioned the tire differences. The current tires I have are 325/50-15 at 13.1" wide. Even with the wider 11" wheel the new wheel/tire combo will be narrower at ~12.5". To maintain the same relative tire/wheel positioning in the wheel tub you just take the extra inch and apply it evenly to both sides of the centerline. So that would be 5.5" BS. Then the extra .125" makes is 5.625.

As it stands now I have about 1.5-2" clearance between this wheel and the inner wheel tub. The problem is the wheel is too far outboard and thus the tire will be into the outer wheelhouse. The 1/2" extra BS would center it up. So I need ~6.125" backspace I guess.
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Old 08-30-2012, 10:44 PM
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so john why didnt you go by the the actual measurement on the weld wheel and not the stamped number?
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Old 08-31-2012, 01:41 AM
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no matter what you did or where you did it, its done. Hope they can take it back. Most rim makers are ok as long as you didn't mount a tire on it.
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Old 08-31-2012, 09:57 AM
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Originally Posted by Vince@MSperfab View Post
no matter what you did or where you did it, its done. Hope they can take it back. Most rim makers are ok as long as you didn't mount a tire on it.
That hasn't been my experience.

I've always been told, once your order a custom wheel, it's yours. Changes are made at buyers expense.
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Old 08-31-2012, 10:34 AM
BBC71Nova BBC71Nova is offline
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Here are some pics. As expected those 11" brakes are swallowed by those 18" wheels. Maybe one day the budget will allow me to upgrade to some big boy brakes .

This is ride height. I'm going back and forth about swapping out the G-link shock crossmember with a DSE like setup. That way I get another 1" lower and exhaust clearance.




Looking up showing outer wheelhouse to wheel lip.


Showing inner wheelhouse to wheel lip.
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Last edited by BBC71Nova; 08-31-2012 at 10:38 AM.
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Old 08-31-2012, 11:52 AM
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That does suck. On the brighter side your car is not painted. Bulge those quarters a tad. Normally on a 69 Camaro you want about 3/4 an inch from tire bulge to lip. Not sure on a Nova.

I am digging those wheels
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