> I've got a 650 tubular disc wheel downstairs > waiting for just such a non-existent tire...
No one is denying that 650 tubulars exist. They do and they are currently available wherever quality bicycles are sold. But they might go by the appellation of 26".
No one is denying that my friend Lynn was sold a pair of 650/26" in a package marked 28" (or 27", I forget.) But I strongly suspect that the tires had been mislabeled.
Once again, take a look at the table whose URL is found below. Another interesting fact is that the "bead seat diameter" (admittedly, a tubular doesn't really have one) for a tubular is about 9mm greater than that of a comparably sized clincher tire. That must be why Continental places this table in the "Fun Facts" section of their Web site:
http://www.conti-online.com/
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