For the guys with 20's what tire size are you runing, I am looking to go very aggressive with the fitment (20x9.5 10mm or below and 20x11 10mm or below),I want the rims to stick out just past the fenders,right now i have the racing hart j5's 19x9 or 9.5 in the front and 19x10.5 in the rear and i think a
25mm offset all around i don't now exactly got the rims used and no sticker on the back of the rims.I know for sure i will have to roll or even cut the fenders and have a streched tire setup just wanted to know what size tires to strech on the rims.

 

with those offsets, I would go 235/35/19 and 265/35/19. Keep in mind these sizes aren't recommended by any manufucture, and not even by me, its just the size i would run to get enough stretch to clear those low offset wheels. You will also likey need camber kits front and rear, to increase your camber into the -3 range for more clearance. Its likely going to take alot of work to get those to look right unless you plan on running at stock height which would just look goofy overall.