A Toyo doesn't actually measure out to a true 37" either. The over all diameter of a tire will also grossly depend on the width of rim on which it is mounted. The big difference between a Toyo and a BFG will be the width as the 37" BFG is only 12.5" and the Toyo is 13.5" wide...the BFG also and has a much smaller tread width. As previously mentioned rim width and backspacing is the most critical with low lift heights and large tires on a Dodge truck...
