15X7 w/4in BS Tire Size Question

I just did it .... ONLY thing different from your wheels and mine... i have sbp 15X7 .... and my off set if 4 1/2.... I have NO issues with 255-60-15... I think you MIGHT/MAYBE have issues with ONLY a 4 inch back space.... MINIMUM 4.25 backspace to make these tires work ... I don't think 275-60-15 will work unless you alter spring location ... hope this helps