Yes, it's difficult to get any availability information at all from anyone. Part of that I think, many just don't know what the tire is?
The Porsche Vredstein's on ebay are dated 3-76.
In my view there is not point to using a tire that old though?
Those are 26.1" inflated and that works for the rears.
The combination battery charger/air compressor that you carry in the trunk does away with the need for the propane tank.
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