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assuming you've removed the lug nuts what you're running into is corrosion on the hubs. Since the wheels are hub-centric, this can be a problem. you have to really whack them a bunch to brake them loose. To prevent it in the future, you have to clean off the corrosion on the hub and the wheel, then use a bit of anti-sieze on the centering hub. But for now, it's brute force...
If it is giving you that hard of a time, try grabbing the tire and wiggling it fore and aft as hard as you can, then kick/hammer the back of it. Keep trying that sequence, as it will free it up. Might take a bit though, if it is really bad.
Loosen the lugbolts and slowly drive the car back and forth a few times (only a few feet). That should help to break them loose. You still might have to kick and hammer, but it will help. Worked on my BMW when that happen.
Remove 3 lug bolts and leave the last one loose then sitting on the ground kick the tire several times around the outside edge staying away from any body parts (car). After you get them off clean the hub and wheel with a "greenie" and a little lube.
Loosen the lugbolts and slowly drive the car back and forth a few times (only a few feet). That should help to break them loose. You still might have to kick and hammer, but it will help. Worked on my BMW when that happen.
This is your answer. I couldn't get any of my wheels off using the wiggle/kick/hammer(with 2x4) methods. Loosened the lugs then drove forward and back as described and they came right off.