What's up guys, so I'm planning to buy some rims for my 2010 fx4 screw. I'm wanting to get some 20x9s but my question is on the backspacing. They come in either +12mm, -18mm or -30mm. What will give me a deeper lip?

 

Those figures appear to be offset values versus backspacing. I believe factory backspacing for these trucks is around 4.5 inches, larger negative offset will be deeper.

 

Thanx!!!! I think I figured it out

 

The backspacing for 2010 fx4 with the 20's is 6.25 with a + 44 offset. The aftermarket wheels with the +18 and +12 offset will have about 5.5 backspacing.