to take them off, i take the valve stem out, use a sledge hammer and my body weight, (i am 210 so it helps) and a flat screwdriver. dont use a screwdriver if you dont want to scratch your rim. i ride my quad, not park it to look pretty so i dont care, but they sell things like at walmart to take bike tires off. not sure if they would be strong enough for that but try it. and to put it back on, i spray it with soapy water, and use my body weight again to get the tire back on. then air it up until i hear it pop then check the tire pressure and set it to what you feel comfortable riding with. or just break the bead and turn the tire 180* while its still on the rim and then air it back up. that might work