[boxccc]

I have this very old and moderately rusty 1050 that i need to get the rear wheel off to replace the tire. 18x8.50-8
It has a singular bolt that holds the rim to the internally threaded shaft. It won't move even after penetrating oil and torch heating. I can't tell what part needs to slide off the shaft or what. I have beat from the inside out with good mallet but no give. Does the whole wheel slide off the shaft or has it been modified? The other side looks the same but not as rusted.
Pictures included.