Backspace for 315/70r17 tires?
I have an '04 LJ with an AEV Highline, 33x12.50r15s on stock Ravine wheels with 1.5" spacers that net 4.0" backspace and allow the flares to cover all but the sidewall bulge. It is still on the stock suspension. The wheel/tire/spacer combination provides ample steering ability at full lock with room to spare and flexes about the same as it did with factory 30x9.5r15 tires and fenders.
Near future plans are: 2" OME Heavy lift kit, belly up skid plate, rocker gaurds, 315/70r17 (34.4x12.70r17) tires and appropriate wheels. Genright 32 Gal. Safari fuel tank.
Is it possible to keep the backspace between 4.25" - 4.0" with 315/70r17 tires? What is the LEAST amount of backspace I can get away with zero-minimal rubbing? The spacers were only meant as a temporary fix until I could get wheels that were properly fitted.