245's are about 25.5" tall I think. I was planning on trying to keep at least 1" clearance between tire and springs but that may be too conservative? The 205/60's on the rear of mine stick out past the lip on the outer part of the fender about 3/8". If the fender ever got below the tire edge it would definitely cut on the tire. I was thinking of going with a 4" backset as that should give about 1/4" gap between the tire and fender lip and 1 1/4" from tire to spring on that 205, if my measuring was correct of course.