Dino, when you are referring to a 60 series tire, you should know just what each of the numbers mean on the tire to accurately identify the size. Lets say you have a 245/60/R/14 tire. The 245 is the width of the tire in millimeters, or 245 mm wide, the 60 is the percentage of the sidewall height in relation to the width, in this case 60% of 245mm. The R is of course radial, and the 14 is the rim size. So, the higher the number of the tread width, the higher the side wall dimension will be. Your real question should be how wide of a tire can safely be put on a 5.5" rim. My tire man says 225 or you're pushing your luck. Hope this helps, Geof