I know the ideal backspacing is 3.75 or less for a 15 wheel, but will I have to put spacers on a 16" wheel with 4" backspacing??? I found a deal on a set of rat holes but they are 4" backspacing 16x8's with 4 1/8 center boars. I really don't care to run spacers at all, hence the 10.50 boggers. not 12.50 wide. I also love skinny wheels, guess I am old school

 

i fail nevermind , didnt see it was in the pre 84 section.

 

1982 sr5 short box all original. just a cruiser. it has some 15 year old p78 buckshot mudders on it now that measure about 34"

 

this is a test

 

Ok, I thought about how to answer this best, and I think I have it.
It depends more on the profile of the center section of the wheel than the rim. My 4.5" bs 15x8 Pro Comp wheels wouldn't fit with the big brake upgrade cause the center hit the caliper.
Only thing I could suggest is buy em to find out if it'll fit, then if it doesn't, you can sell them. Maybe even for profit.

 

Ok what about 12.50 wide boggers? Well they rub bad? Found a set of used ones for a good price.

 

Im running 33x10.50 BFGs on a 15x7 w/3.75 BS and they are perfect when I had 3.5" BS wheels they rubbed...so I dont see why 4" BS wouldnt work...