What is the backspacing on these rims, size 16x8, 5 by 135mm bolt circle. AR's website says 4.5"

Eagle says 4"

and MT says 3 5/8 "

are these correct measurements ?

If so then the MT's would help push the wheels a little further outside the fender ?

thanks.

 

Correct, the less backspacing the farther the rim will "stick out".

 

rims can pretty much be made with whatever backspacing you want so the number are probably right. The problem you run into is the problem caused my the change in backspacing. If you get a greater backspacing than stock you will wear out your suspension and steering components faster. The increase in backspacing puts more preasure on theses components. How much exactly I couldn't tell you.