Backspace Mismatch Question - Pontiac GTO Forum
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post #1 of 5 (permalink) Old 12-10-2013, 01:40 PM Thread Starter
 
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Backspace Mismatch Question

I am interested in replacing the spare (or 5th, if you will) wheel for my vehicle as the current one has a leak (its not the tire). The backspace on the original 14 x 6 steel wheels appears to be 4 3/8". Most after market wheels seem to indicate a backspace of either 4", 4 1/4", or 4 1/2". I am interested in comments/opinions as to how critical it is to have the wheel backspace identically match on a particular axle (ie, front or rear) as regards to handling, etc.

To be noted, one of the wheels on the vehicle was replaced a number of years back, and I recently noted that it appears to only have 4" backspace. I haven't noticed any huge problems, so I suppose I've somewhat answered my own question, but I would like to know what others think. If you have a mismatch front, would you expect some degree of pulling or other issue?

TIA
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post #2 of 5 (permalink) Old 12-10-2013, 10:40 PM
 
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As long as the tire fits and doesn't rub, backspace isn't an issue, especially if it's just the temp spare. It doesn't change alignment at all.

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post #3 of 5 (permalink) Old 12-11-2013, 09:45 AM Thread Starter
 
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I can see that it won't affect caster, camber or toe-in specs.

I guess what I was wondering is the affect of the vehicle stance seemingly being off center at the axle having the mismatch. But maybe the effect may be so subtle that it is no more impactful than having one person in the front seat?
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post #4 of 5 (permalink) Old 12-11-2013, 12:16 PM
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Are you sure you're measuring right? Check this page.
https://www.rsracing.com/tech-wheel.html#backspace
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post #5 of 5 (permalink) Old 12-11-2013, 12:31 PM Thread Starter
 
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Originally Posted by Rukee View Post
Are you sure you're measuring right? Check this page.
https://www.rsracing.com/tech-wheel.html#backspace
Yes, I measured the old (original) wheels and the replacement wheel in exactly the same fashion and just as indicated in your reference ... very useful reference BTW.
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO Wheels & Tires

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