I have the 245's on my trailer for several years with no issues. First of all, I am not a tire engineer but I am an engineer. The logic I used is that the diameter and sectional width of the 245 is the same as the original ST tire ( or very, very close ). I have a friend that used the 245 for years also with no issues. I did not want the increased diameter of the 235LT tire. The wider rim width spec is because of its use on light trucks.