Just saw Mike beat me to it, here’s how I had it typed up. Same story, same results.
My front tire blew at the clowder, which would be the back tire on your machine. One of the middle wheels would be easier. It took a group effort (I still owe a round) involving high-lift, bottle, maybe even screw jacks, some chunks of wood, down pressure on the blade and lots of hands. We let the air out of the spare to shrink it down and put the bearing and seal on the shaft first to gain a little more space to slip the wheel in. It might have been -10 that morning, probably easier in a shop or on a warmer day. Solo it would probably worth taking the bolts out and opening up the tracks. There are photos out there....