i work at an auto center and this isn't that uncommon .. take all the lug nuts off except for one .. loosen that one up good but don't take it all the way off (so the tire won't go flying when it does loosen up) then just kick the shit out of it but make sure you hit the tire not the rim. At my work sometimes we actually have to hang from the lift and kick it . .or take a sledge hammer .. or then when its really bad a really long 2x4 and a point to leverage it from. Or if you still can't get it off and don't want to hit it too hard while its on jackstands take it somewhere and pay 12 bucks for a rotation. . that way if they break it they buy it and they can beat on it while its on the lift