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I ran 255/60/15 tires on one of my 1970 Cutlass' on all 4 corners and it never rubbed. I even had bad suspension on the car at the time. The springs were very weak and the car would bottom the front crossmember out going through some intersections if I had even one passenger in the car. But the tires were good to go.
In my opinion a really nice looking stagger for 15" tires is a 235/60/15 in the front and a 255/60/15 in the rear.