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Welcome, I'm Chris (aka Moose) I prefer to work when others don't, I am here around lunch and after dinner till after midnight.
what overall wheel dimensions do I need to be looking for I am not quite sure what your asking for. You already mentioned the offset, width and diameter you want. Your current tire is a 265- 50- 20 on a 8 inch wide wheel.
Your diameter is 30.44 inch,
Without a lift you are only going to be able to increase the tire radius by one inch.
My opinion would be the 255-70-18 or 275-65-18 KO tire
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I will need you to measure your stock wheel for me to see what the replacement wheel is going to do (set in or out). You have to lay something flat on the back side of the wheel touching only the surface where the wheel weights clip on. Then measure the distance to the surface that contacts your hub. I can not tell you which wheel will work without a comparison to the original ones of which there are no specs published.
I prefer an actual measurement to catch the backspacing and offset measurement at the same time like this link.
You mentioned it has a adjustable lift. Are you ever going to drive it with the suspension at stock height with the new tires? If not then I need to know the clearance from your current tire when turned full left and right from the fender and bumper in the front at the height you plan to leave it at?
If your current offset is 56.4 mm on an 8 inch rim. If you used the exact same offset on 9 inch wheel the tire would stick out 1/2 inch more but also 1/2 inch in. To make it stick out a full 1 inch you would need to decrease your offset by 12.7 mm.
Hello again Chris here,
Sending in your refund request now.