2000 Honda Civic Changing the front tire

I've never had this problem before. I loosened the lugs and jacked up the car - the tire has about a half inch clearance off the ground (out of gear it will easily rotate)[img:0c16a556ea]http://www.2carpros.com/forum/automotive_pictures/149330_Civic_front_tire_1.jpg[/img:0c16a556ea]. I removed the four tire lugs, but the tire won't budge. It should just fall off, what's holding it on? I tried a rubber mallet, but it still won't budge.