You can put 22" on the GS. My cousin has it.

22 x 8.5 all around with some minor mods in the front. This is a easiest 'bolt-on' solution to get 22's on the GS.

All staggered means is that your wheels are different sizes from the front to rear. Like on my car I have a staggered setup where the front wheels are 20" x 8.5" in the front where as my rear wheels are 20" x 10"

I beleive he had to grind down a bit of the control arms (maybe - not 100% sure) and alter the wheel well plastic liner for a 'no rub' fitment. He also upgraded the brakes, 22's are getting up there in weight, even with the new brakes he told me its much harder and takes alot more pedal force to stop the car.

THEY LOOK GOOD.
His GS on 22's beside my GS on 20's make me start to think I should of done 22's!

 

stick with your 20's man
but i think you've already decided to do so.

 

i just love that staggered look and since my man charmz said 8.5's is the widest I can go I might stick with the 20's and do a 20 x8.5 front and like a 10 10.5 in the back

 

im sure there are ways to do a 22x10 in the rear.......
money talks and makes it all happen.

im assuming you will need to just do more altercations to rear suspension and fenders to make it work tho

 

naw too much work charmz roll the fender and all that other b.s. i'll chill