I live in Pittsburgh, Pa. I Purchases a used Jeep Compass Latitude in Jan. Jeep had 16,000 miles. I'm very happy with it , I put 6,000 miles on it already with no mechanical problems. I have 17 inch wheels, would like to put 18 inch wheels on. Can anyone tell me if 18 x 1-1/7 or 18 x 8 size will fit and what would be the largest size I can put on either of these 18 inch wheels?