Yes, it will just be a little hard to get the air in it to start to seat the bead since there will be a descent gap between the tire bead and the wheel but it will definitely work. But like you said I would only use it as a spare. You might want to check clearance on the front though. I can't put a rear rim on the front of my XP4 even with 1.5" spacers. The tire hits the bottom of the shock when at full turn.
thanks for the response. my rzr came with spare rim & tire but its a rear. would like it to be a front. wondered about using front tire on rear rim since i already have the rim it would save me the cost of a new rim. will check clearance before i commit