Pulled off the rear wheels because one tire was starting to squirt calcium chloride through the cracks in the sidewall (The tires were rotted when I bought the tractor 2+ years ago, but I figured I would get what life I could out of them as there was lots of tread). Brought the wheels and tires to the local tire shop - they pulled off the tires and cleaned up the wheels, which now look like lace - there are pin holes all over the wheels that had been kept closed by rust and paint. I can't put new tires on them, so I ordered new wheels, which hopefully will be here by the end of the week. In the meantime, the tractor sits on jack stands. I considered welding up the old wheels, which I may do yet, and I'll have a set of old spares maybe...we will see.