Back spacing

[moparker]

Lookin at a set of 15×6 Cragar S/S for my 75 Scamp. Will 3 3/4" back space work for the rear?

 

[cudajames]

here is a nice tool Wheel Offset Calculator

The bs conversion is a positive 6

from there you can compare your existing setup

 

[dICKj]

What is the back spacing on a standard 15" rally wheel? Is that different than a stock steelie?

 

[duster2]

15 x 7 Ralley - 4.25 BS
15 x 7 Steel. - 4.25 BS
That is a Factory wheel. Aftermarket backspace can be what ever the manufacturer can make or chose to make.

Frank