Maintenance-Free Tires ?

D > I have a number of old things sitting around that need tires but are D > not worth the expense/trouble/work involved. Has anyone here any D > experience with filling tires? I was wondering how portland cement D > might work as a tire fill or if there were other ideas for this?
The cement would certainly keep the device from being top-heavy! Main thought is hwo do you intend to keep the cement-filled tire round? Against the ground will develop a flat spot; suspended I would think a teardrop-shape would take effect, against because of the weight of the wet cement.
Since cement doesn't seem to be the way to go (or at least for the way I'm thinking -- you didn't gives us any details as to the size of the tires, weight to be beared), as the tires are hollow (else couldn't be filled) what about an air-filled bladder like the old (automotive) tire tubes?
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