Backspacing for 28 X 11.5 Hoosiers

[TURBO 6]

What backspacing should I get for these tires?

 

[azgn]

that would depend on what size rim you are using....on a 8" rim, 4" backspace will work......3.5 is better to clear the frame

 

[TURBO 6]

8" rim. I figure I could get by with a 4" BS. I didn't want to roll the fender lip if I don't have to. I already have the rims but I wanted to see what you guys have to say before I mount the tires on them. Thanks!