Proper backspacing for front wheels, info needed

[Notplayn]

I am ordering Weld wheels, 15/8 rear and 15/7 front. I am going with 4.5 backspacing on rear. What should the front be?

Thanks

 

[grocerygetter]

my 17x8s are 4 bs out front

 

[2QUIK6]

Stock GN backspacing was 4", Ttypes got 3.75 BS
I have 15x7 up front with 3.75 and 15x8.5 in the rear with 3.75. They do stick out just a bit but still clear the outside fender well with no rubbing and no rolled lip with 275/50 tires and MT ET streets 28x11.5

4.5 BS on the rear may be close to rubbing the inside frame with a 275 tire.

 

[T Spool]

15x7 3.5 backspace

I ran weld draglites 15x7 up front with 3.5 backspace and M/T sportsman 26x8.5. On my car lowered 2-3 inches it was a perfect fit, no rubbing. I wouldn't recommend those tires though for the street.

 

[RUQWKNF27]

I wonder how a 8" wide wheels would look with a 3.5" BS???