1968 Chevelle Rear Wheel Backspacing Question? - Chevelle Tech
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post #1 of 11 (permalink) Old Oct 30th, 17, 4:18 AM Thread Starter
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Gabe
 
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1968 Chevelle Rear Wheel Backspacing Question?

Hey guys, anyone know how much backspacing can be put into the rear rim on 1968 Chevelle with a stock 12 bolt. I'm having a set of wheels custom made and I know the norm is 5.5" but from what I see I think it would be better to put a bit more into it say 5.75" or 6.0" but the lower shock is going to be getting very close to the lip of the rim, any info appreciated.
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post #2 of 11 (permalink) Old Oct 30th, 17, 4:40 PM
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Re: 1968 Chevelle Rear Wheel Backspacing Question?

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Originally Posted by OURSS396 View Post
Hey guys, anyone know how much backspacing can be put into the rear rim on 1968 Chevelle with a stock 12 bolt. I'm having a set of wheels custom made and I know the norm is 5.5" but from what I see I think it would be better to put a bit more into it say 5.75" or 6.0" but the lower shock is going to be getting very close to the lip of the rim, any info appreciated.
What width and diameter wheel?

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post #3 of 11 (permalink) Old Oct 30th, 17, 7:55 PM Thread Starter
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Re: 1968 Chevelle Rear Wheel Backspacing Question?

15" rim 10" wide.
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post #4 of 11 (permalink) Old Oct 30th, 17, 8:24 PM
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Re: 1968 Chevelle Rear Wheel Backspacing Question?

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Originally Posted by OURSS396 View Post
15" rim 10" wide.
There's a good reason 5.5" backspace on a 15x10 wheel is considered the gold standard, Gabe. In this particular case, more probably isn't better.

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post #5 of 11 (permalink) Old Oct 31st, 17, 1:48 PM
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Re: 1968 Chevelle Rear Wheel Backspacing Question?

Drum Brakes or the Wider Disc Brakes ?

There are ways to Adjust/move the Rear Lower Shock Mount Bolt
so it does not interfere with the Rim of a 15" x 10" Wheel with a 5.75" /6.00" BackSpace

One way is to use a Round Headed Bolt to attach the Lower part of the Shock to the Bracket

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post #6 of 11 (permalink) Old Nov 17th, 17, 10:28 AM
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Re: 1968 Chevelle Rear Wheel Backspacing Question?

Quote:
Originally Posted by Clint44 View Post
There's a good reason 5.5" backspace on a 15x10 wheel is considered the gold standard, Gabe. In this particular case, more probably isn't better.
I have 5" backspace on my 15" x 10" wheels 295\50\15 tires and it rubs the outer wheel well if I hit a bump.

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post #7 of 11 (permalink) Old Nov 17th, 17, 10:34 AM
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Re: 1968 Chevelle Rear Wheel Backspacing Question?

I have 9.5"X17" with 255/50/17 on the back of my 68 without rubbing if that helps you any


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post #8 of 11 (permalink) Old Nov 17th, 17, 12:22 PM
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Re: 1968 Chevelle Rear Wheel Backspacing Question?

The shock mounting isn't the only problem. You can run into the inner wheel tub on bumps if you're car is lowered because the clearance isn't exactly vertical and there is less clearance in the upper portion. I have 5.5" backspacing and occasionally rub on the inner tub with 275/60s. My wheels are 9" wide and also very close to the outer lip. I can just about fit one of my sausage fingers in there. I don't rub on the outer lip, though, just the inner. My car is lowered 2" in the rear. I have new and stiff poly bushings in UMI lower control arms and Edelbrock adjustable uppers that won't deflect like stock arms with rubber bushings. I think if I had stock bits it would rub every which direction on off-camber bumps.

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post #9 of 11 (permalink) Old Nov 17th, 17, 4:26 PM
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Re: 1968 Chevelle Rear Wheel Backspacing Question?

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I have 9.5"X17" with 255/50/17 on the back of my 68 without rubbing if that helps you any
Rick, what's the backspace on those 17x9.5's? If it's anywhere close to a 0 offset (5.25"bs), those wheels will easily fit, especially with a narrow 255 tire.

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post #10 of 11 (permalink) Old Nov 17th, 17, 4:45 PM
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Re: 1968 Chevelle Rear Wheel Backspacing Question?

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Originally Posted by Tommy the Cat View Post
The shock mounting isn't the only problem. You can run into the inner wheel tub on bumps if you're car is lowered because the clearance isn't exactly vertical and there is less clearance in the upper portion. I have 5.5" backspacing and occasionally rub on the inner tub with 275/60s. My wheels are 9" wide and also very close to the outer lip. I can just about fit one of my sausage fingers in there. I don't rub on the outer lip, though, just the inner. My car is lowered 2" in the rear. I have new and stiff poly bushings in UMI lower control arms and Edelbrock adjustable uppers that won't deflect like stock arms with rubber bushings. I think if I had stock bits it would rub every which direction on off-camber bumps.
Tom, 15" tires tend to have their own fit problems because of their taller, more flexible sidewalls. They need to have more side clearance, to allow for the extra sidewall flex. My 70 is lowered 2" in the rear, has 20x10's w/5.75"bs (+6 offset), 305/30/20's, yet no clearance issues inside or outside. Rear suspension is all stock, for now. It does have rear disc brakes but if they widened the rear track, it is very minimal.

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post #11 of 11 (permalink) Old Nov 17th, 17, 7:44 PM
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Re: 1968 Chevelle Rear Wheel Backspacing Question?

Sorry I forgot to add my BS, it's 5.5", frnts are 8"X17" 4.5" BS with 245/45r17


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