I live on the coast and we have allot of rust on most surfaces, i just finished trying for over an hour trying to get a 16" tire off a 4x4 ford van, the tire was rusted on the rim, in the end I used a hand drilling hammer and a cold chisel and a slotted screw driver drove the screwdriver under the bead and the cold chisel to cut the steel bead wires and then could get the tire off, used a wire wheel to knock the clods off and smooth it up some.
same goes for ATV tires
We are in a remote area that has some paved streets we are allowd to drive snowmobiles and atv's on the city streets, the pavement cuts down on dust but eats off tire tread somthing fearce, I avoid them when I can which contributes to airbourne dust problem.