back space not sure - Team Camaro Tech
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post #1 of 5 (permalink) Old Feb 26th, 11, 09:27 PM Thread Starter
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back space not sure

Do I put a straight edge accross the wheel or do I need to cut it to fit inside the outter mounting flang?
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post #2 of 5 (permalink) Old Feb 26th, 11, 11:10 PM
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Re: back space not sure

No cutting needed, just across outer edge.

From inboard flange to mounting pad. Here's a diagram....

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post #3 of 5 (permalink) Old Feb 27th, 11, 04:44 AM
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Re: back space not sure

68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53
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post #4 of 5 (permalink) Old Feb 27th, 11, 07:42 AM
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Re: back space not sure

I think this drawing from the same page Garth links to really helps show why there is so much backspacing confusion. Note where the wheel (rim) width measurment is taken from.

Then use this drawing to see where the backspacing (rear spacing) measurment is taken from.


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post #5 of 5 (permalink) Old Feb 27th, 11, 08:20 AM
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Re: back space not sure

The confusion seemed to stem from years ago when it was measured from the mounting bead. eg. It used to be a 8" wheel with 4" BS was zero offset.

With the advent of aluminum wheels & positive offsets there was a lot more problems with wheel interference to adjacent suspension components. Now wheels are based on offset with respect to the tire centerline vs. mounting face. The backspace is the rear dimension with a straight edge acoss the rear of the wheel. This is typically approx 1/2" more than the bead dimension. The same 8" wheel w/ zero offset would have roughly a 4.5" backspace.

Last edited by Lonnie P; Feb 27th, 11 at 08:35 AM.
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