275 -40 -17 with a 4.5 back space wheel is on there now. I put the rear tire on the front its 295 - 45- 18 a SUV tire with a 5.5 inch back space rim,, I believe. Side wall is to tall for front I feel. and it hits sway bar , a Hotchkiss inch and a 1/8 th I think. its all over 10 years ago that's code for 15 probably. lol I am Thinking 285 40 18 or 19. with a 5 inch back space. any one have a 285 on the front ?? what back space ?