if i got this right im pretty sure my wheels wont work. im wanting to put a 6in lift on my 2wd 08 but the wheels i have now have a +25mm backspaceing which i think is 1in. According to procomp I need at least 4in.

So am i correct my wheels wont work?

 

The +25mm is the offset, not the backspacing. And the offset cannot be converted to BS without knowing the width of your wheels.

 

20by8.5