Why wont the wheel move after replacing brakes?

The reason will more than likely be because when you changed the pads you had to compress the caliper piston in order to put new pads on. you did'NT compress it far enough. did you have a hard time putting thr caliper and pads back over the rotor. If so this is your problem. When you say that the tire doesn't spin, do you mean it feels like someone has their foot on the brake or that it doesn't spin as freely as it did befor you changed the brakes. write back and let me know.