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Discussion Starter #1
I have a friend with a 1968 Mustang, he's wanting 18 x 9-1/2" wheels in the rear.

What backspacing should be used?

Thanks
 

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Yes. With the 5.5, I get a little tire rub inside the wheel well on big bumps - passenger side only due to the design of the cars, but not on the fender lip. My car is also lowered a bit. The 6 should fit without any issues. Hope this helps.
 

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I have 6.75" backspace on 18 x9.5 on my 67. It has a rear disc brake kit which required and 1/2" of backspace so if your running drums in back 6" would probably be just right.
 
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