Giant Tires?

Where can you get those giant tires that you would use to flip over or hit
with sledehammers?

Matt Hughes' farm

Some places that sell farm, or heavy, equipment usually has some junk ones laying around.

I got a big farm tractor tire given to me. If you know any farmers..see if they got a old one laying around.

same as these others said, only I'll add that the guy told me it was free to take, but make sure I REALLY want it because it's 25 bucks to get rid of. :)

just dont hit it too hard, hammer could come back and hit you in the face and then youll hear someone yell "You'll shoot your eye out!"