I don't remember what the fronts are, I think 4 3/4" back spacing.
If I get a chance I will measure them.

6" is the back spacing. thats different then the offset.

5 1/2" backspacing on an 11" rim would have a 0 mm offset.
That means the mounting surface is dead center on the wheel.
6" pushes the rim 1/2" to the inside - or 12.5mm offset


The front and back fender lips had to be rolled, on big bumps the tire will rub the lip and can cut the tire.
The fronts are 275 40's the backs are 315 35's

 

thanks,but can i not get these in 16'' and if so,would that not keep me from having to roll the lip?---plus i have air shocks in back that i can pump and stiffen the rear--thanks