Wheel Help!

[danny4runner]

I'm currently running 17" Sport wheels on my 2007 with 285/70 BFG Rugged TA's 1.25" spidertrax with a great stance and no rubbing.

I'm looking at getting some 20x9 XD's (Keeping the 17's as well). I'm not sure what offset I should be looking at? Stock 17's are -12 I believe... Some XD's I'm looking at are -12 offset and others are 18. Looking to wrap them in 285/55or60/20 BFG AT2. I don't want them to stick out much or if any at all or rub the UCA of course...I'm lost! Any help would be greatly appreciated.
I'll be getting my Toytech ultimate here soon as well.

 

[gtb129]

I think 4.5 backspacing is considered the closest you can get to the UCAs with 285s. Without occational rubbing anyway. So go to a calculator, instert 20x9, 4.5 BS and have the calculator convert your offset.

 

[t-man]

stock offset is +30, they are 17x7.5 +30. It's stamped on the inside of the rim too. Here's a link to a visual calculator that I find very useful, put in the stock specs then the specs of the rim you are looking at and it will give you an overlay to see what happens and give you the exact numbers in mm too.
Online Wheel and Tyre Fitment Calculator. Offset, Tyre Stretch and Speedo Error | Will They Fit