When you use a wheel with more back spacing and don’t change the tire or rim size it move the centerline of the wheel in. The scrub radius is the difference in the centerline of the wheel and tire compared to the plane of the ball joint and where they both meet the ground. By moving the wheels in or out you will change the static difference. Less scrub radius= less steering effort since the wheel is actual turning closer to its true centerline. More scrub= more turning effort. That is what I know of scrub radius for now I am no suspension expert but I will begin studding vehicle dynamics this fall In a few more years I can get you a much better answer with the theory and hopefully experience to back it up.
Brian
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