I know this can/will depend on the overall diameter and thickness of the tire/wheel combo. I'm looking at buying/mounting an 8.5 or 9" tire/wheel combo. I'm trying to determine how much of it I can shove back into the wheel wells.

Specifically, the wheels I'm looking at have positive offsets in the 10mm to 30mm range. The larger 30mm offsets have 6" or more backspacing with the wheel width in question. Since it looks (to me) like the stock backspacing is 4.75-5", I'm trying to figure out where backside contact occurs.

My tires will be between 30-31.5" in diameter.

Thanks
gp

BTW,,,Yes, I'm a new owner!