Back spacing

What is a good back spacing on a 10" wide wheel with 12.5" 33" tires?

 

In order to avoid conflict with the suspension backspacing needs to be about the same as the stock wheel, of course depending on the lift you may have rubbing problems elsewhere.

 

3.5-3.75'' BS. youll need to be lifted at least 2.5'' to clear all plastic to btw.

 

Yeah I am doing a 3" lift with 12.5 33" tires

 

I have 33x12.5" on 15x10" rims with a 3" lift and 3.76" BS and I had to cut quite a bit off and I still rub on the firewall off road. I would try for a 4" or a 4.5" BS if you don't want to cut a lot. Take a look at my build you will see everything I had to cut to make these tires fit.