Who's running the same size tires front and rear

I ran 225/60/15's on all 4 corners of my Duster for awhile with cop wheels, 15x7 with a 4.25" backspace. Now staggered with 275/35/18's on 18x9's in the front with 295/40/18's in the back on 18x10's.



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How much trimming of the finders did you do? And what back spacing? The prior owner put 16’s on my car, which the selection is nothing.