Thanks, Clubman, food for thought there. I might write to Schwalbe and Panaracer just to see what a minimum order would be and what cost. After all if they have the moulds etc, it is surely not a huge deal? If they said eg 1,000 minimum, surely it would be possible to "crowdfund" or "viral marketing" sort of process, where forums, facebook groups, VCC, shops, collectors, enthusiasts, cycle-jumblists worldwide etc etc etc are spammed and encouraged to spread the word, and to get a conditional commitment from say half of that number? A pair each for 250 people in the world, surely?