So can anyone tell me what offset and wheel width I need to be able to fit 37x12.5 inch tires? I've seen a few guys with 22x12 rockstars (-44mm offset with 4.77 of backspacing) on 37x13.50 kuhmos with only a torsion lift.. I can't mess with anything more than that because of my air ride in the rear. No one really makes a decent lift for the luxury package. I'd really like the 22x11 thugs (0mm offset) which means that they would sit "in" further" than the rockstars so they'd probably rub on the torsion bars. The rockstars and diesels both have negative offsets so they'd stick out more. Where does the tire typically rub on most set ups with 37's? I remember reading that the outside rear tread hits the backside of the front wheel well? I don't mind trimming my wheel well a little so that is the most important question that I need to know. Due to the limited garage height I'd rather cut than lift
Also note the stock wheel size/offset are as follows
Hummer H2 Wheels:
Size: 17" x 8.5"
Bolt Pattern: 8x6.5
Off-set: 18 MM
Backspacing: 5.5"
Weight Rating: 3,195 lbs per rim
It seems that the backspacing of the thugs will be closer to the stock wheel..
Here are the specs for the thug.
Offset: 00mm Backspacing: 5.47" Bolt Pattern: 8-165
Here are the rockstar specs
22x12 -44mm offset with 4.77:backspacing
Essentially if I go with the ATX THUG I'll have to deal with greater diameter of the tire but that's it. The rockstars would stick out about 2 inches further than the thugs. It would be nice if I could 'try" a set but I don't live close to anyone that has a similar setup. Worst case I could add spacers like roush suggested