I have a 2008 F150 FX4 Flareside with 18" OEM 5 spoke wheels. I wish to replace the wheels and have extensively searched this and numerous other sites to confirm the OEM wheel specifications; such efforts have yielded only limited success. Can someone please confirm the following?
I need to know exactly what I have in order to move forward with an aftermarket set and deal effectively with related fitment issues. Offset is my primary concern. If my data and assumptions are correct, the OEM wheel offset is 44mm and the wheel I'm interested in is -12, such offset would move the centerline of the wheel outward by 56mm or 2.2". This would be far too dramatic for me.

All responses greatly appreciated.

 

Your lug pattern is 6x135mm and the backspacing is 5.5 inches. BS is just much easier to understand and visualize since it doesn't change with wheel width.