Too bad you found out the hard way what happens when things freeze quick. You should either store the tractor on a hard surface like concrete, gravel or with a sheet of plywood under each wheel. Not all the time, just in the fall when it turns from mud to tire gripping frozen stuff. It can freeze hard enough overnight that the tire will be ripped off the bead when you move in the morning. We have that type of thing going on right now. It was rainy and 50's from Sunday thru Wednesday and that thawed the ground and made the top 8" into soup, then hit 6 degrees last night! I'm sure that if I had left anything parked in mud, it would be in there solid.
Oh, you or someone thought that a partially frozen fill would cause this. Nope. At least not that I have ever seen. The solution will get sort of thick like a slurpy, but won't freeze solid like a rock in one area and be liquid in another. Lot's of folks used to fill in the spring with tap water and drain in the fall. Many were stuck with tires that went lump lump lump after they froze up solid when they forgot to drain in time. Imagine a 3/4 filled tire froze talk about "unbalanced"! If the tire wasn't weather checked too bad, it was fine after it thawed out.
jb
Oh, you or someone thought that a partially frozen fill would cause this. Nope. At least not that I have ever seen. The solution will get sort of thick like a slurpy, but won't freeze solid like a rock in one area and be liquid in another. Lot's of folks used to fill in the spring with tap water and drain in the fall. Many were stuck with tires that went lump lump lump after they froze up solid when they forgot to drain in time. Imagine a 3/4 filled tire froze talk about "unbalanced"! If the tire wasn't weather checked too bad, it was fine after it thawed out.
jb