I am looking to buy a set of aftermarket wheels for my '01 superduty and have a question about wheel backspacing. I am currently running 315/75/16 on factory 16" wheels which have a backspacing of 4.5", correct me if I'm wrong. At full turn the tires barely clear the leaf springs. If I go with an aftermarket wheel with a backspacing of 5" and the same size tire, there is a very good chance that the tires will rub the leaf springs. Am I correct on this or am I missing something? Does wheel width come into play anywhere?