18's on a Cougar?

[OCcougarboy27]

Anyone know what backspacing I'd need to get 18's on a 67 Cougar? The rear axle is narrowed an inch from stock, too.

[Bryce]

It would be the same as 17s or 15s if the outside tire diameter is the same and the width is the same. So if you put on some old wheels and took some measurements you could determine what would work.

[OCcougarboy27]

Cool, thanks.

[rayy]

A friend of mine has 18s on his Cougar, 4.5 on the front and 5.5 on the rear. You could prob go with more on the rear like a 5.7 or so since the rear has ben narrowed.

[OCcougarboy27]

You mean the backspacing?