It depend on how much you want them to stick out. Recentered hummer rims are only about 8.75'' wide so you might want a little more backspacing. I'am running 3.5'' and think its perfect but if you dont want it sticking out past the body 4.5'' of backspacing might be better. Also depends on your tire size because my 38.5-15.5-16.5 swampers balloon out causing them to stick out more. there are some pics down below( look at the end of my pics).