Wheel backspacing & offset info
 

Does someone happen to know what the back spacing and offset is for a 17 x 8.5 and a factory 17x8 wheels, Dodge can't tell me this info for some reason :argh:. I've see post say the backspacing is either 6 or 6.25 and 40-43 mm offset for a 17x8 wheel. I would also like to know the correct numbers for a 17 x 8.5 wheel so as to not put more wear/stress on the ball joint and wheel bearings.