Hi Guys, what is the optimal backspacing for 18x8.5 fronts and 18x10 rears on our GN's?

[JCPerformance]

I know there are experts in here that have or have had these same rim dimensions.
What are your BS numbers?

Thanks

 

[dsapper]

I have 18x9 and 18x10 and 4.5" bs was perfect

 

[Bescurred]

I have 18x9 and 18x10 and 4.5" bs was perfect

Did you have to roll the lip?

 

[dsapper]

No, I did roll it though because I went with a fairly aggressive suspension setup and lowered it quite a bit.

 

[JCPerformance]

Ok, 4.5 rear bs...I've seen more 4.75 bs on 10 inch rears, but I'd love to see pics if you have any?

Anyone have a bs measurement on a 8.5 inch front?

Thanks

 

[dsapper]

the thread is here http://www.turbobuick.com/forums/threads/1987-pro-touring-grand-national-from-the-ground-up.351277/