Identical problem with mine, except it's the outside edge. cut the outside up front due to bad idler arm, rotated, and both rear tires are now gone (2K mi later). I even thought that my rear springs are sagging, because the alignment checked out OK.

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1985 190D 2.2l Sold-to Brother-in-law
1996 Mustang 3.8l -"thinks it's a sports car"
1988 Grand Wagoneer - Sold (good home)
1995 Grand Cherokee Ltd -"What was I thinking??!!"