I have 16in rims but what is the max tire size i can put on
my 1994 F-250 without a liftkit??[:-]

It depends on a lot of things. 285/75/16s might rub a little but it depends on how your truck sits. Those are the same as 33x12.50s but a little skinnier. My friend has 33s on his stock F250...they only rub when it is really flexing and the wheels are turned.

I have an O3 F350 and it's stock...I'm running 35" Nitto Terra Grapplers. 315/75R16. Found a guy in NC selling them on ebay for a good price. They rub if I cut it real sharp...but that's only in tight situations...other than that...it's really not a problem. I bought it with 35" on there already....really liked the look with the wheel well and figured, if it'll fit...I'll run it.