edit- George and I were typing at the same time!
you still need to keep air pressure in the liquid filled tire. it keeps the beads seated (even if you use a tube you need some air pressure if the bead starts moving you will pinch the tube and cause a messy leak) my Farmall had calcium in the rears for over 60 years before they rusted out (at the stem). I welded them up and tubed them. I have been told that if the fluid completely covers the rim it won't rust out because the air is needed for the rust.
I went with foam filled tires on my SGT - downside they will have to be cut off the rims when they are worn out - that won't be in my lifetime so I really don't care. I have summer tire/rims for the SGT that are air only but I stopped mowing with it about ten years ago when I picked up my first ZTR.
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