The rims are forte f-51. They are 20 x 9. I don't know about the offset yet. I am planning on getting the leveling kit but i want to know how big of tires can you run on these with the stock suspension.

MY TRUCK IS LOWER 3/2 ON 24's NO PROBLES:thedevil:

 

what size tires do you have on the 24's?

 

Typically, the max 20" tire size without rubbing is a 305/50/20. I'm running a 305/55/20 with a PRG lvl kit and have no rub. Offset will make a difference, but you should still be fine with the 305/50/20's

 

Do you have a pic of your setup? nevermind. i just saw you had some on your website. Looks good.

 

ive got the f-51s on 305-50-R20 no rubbing here. need to lower the rear for a level look though.

 

I actually want to raise the front and go with a little bigger tire if i can. Got any pics of yours lowered?

 

I have 275/55/20's and they fit fine....

 

interesting. i have 305/55-20 Nitto Terra Grapplers and a PRG mini lift. Tires are mounted on Centerline Stingray III. I have minor rubbing on the inner front splash guards and fenders. i don't really want to do the pinch weld. It rubs, very slightly, on the fender liner too and max lock on the turn

 

interesting. i have 305/55-20 Nitto Terra Grapplers and a PRG mini lift. Tires are mounted on Centerline Stingray III. I have minor rubbing on the inner front splash guards and fenders. i don't really want to do the pinch weld. It rubs, very slightly, on the fender liner too and max lock on the turn

Looks like they have an 8" width and 8.5" width, and both are available in 5" b.s. So if you are running the 8.5" your rims are out an inch over the stock ones, but only half an inch with the 8" wide IIIs. The pinch weld mod looks easy though, and you might need to take off just a bit.
Btw, those tires are only 33 x 12.2 on the 8.5" rim, so it shows how critical the backspacing/offset and/or rim width can be.