For what it's worth...
Firestone's USA web site still lists some 900R20, 1000R20 and 1100R20 tires in varying degrees of on-off road tread pattern. On the other hand, their partner companies Dayton and Bridgestone don't list these sizes as available. Goodyear USA also lists similar size tires as being available. I have no idea of costs for these tires.
Neither Coker Tire, Universal Tire nor Specialty Tires of America (all are sellers to the "vintage" market, STA makes the much discussed directional 1050-16 inch tires) list 900-20, 1000-20 or 1100-20 tires so I wonder if this means that they think that the market is still adequately served by the "normal" tire makers.
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