Markuson
SILVER Star
Search for my "34s on stock suspension" thread to see the effort. 285/70R18 and 285/75R17 are effectively the same outer diameter, and I have the same tire. Only difference is I have +25 offset wheels vs the +60 stock wheels, but you can add a 1.25" spacer to get you to about +28 offset.
You can put "35's" on, but my "35" Nitto Ridge Grapplers are really just a touch over 34, and the width does mean rubbing on full lock even after significant adjustment in alignment (moving wheels forward) and the Slee relocation kit.
The 285/75/17s are almost exactly 34 also, but narrower, which would be just about perfect.
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