a backspacing ? for our 4x4s

[a2tripp]

72 gmc k2500: I currently have 35s on a 16 inch rim, want to go to some mt classic wheels.





as you can see, too much bling, for me at least. I think I have a 10 wide wheel now, on 12.5 tire. Tires are good and want to keep them but down the road I might be going to some wider swampers, maybe not. So I dont want my tires to stick out too far nor do I want them to rub on the springs or steering. Never bought NEW rims, what backspacing would be good?

are 12.50 ok with a 10in rim? off the road I mean

thanks