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Old American Tire size

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I bet that's a mistake, and they are really 26 X 1 3/8 or 37-590s, which is the wheelchair standard. I have seen similar tires on ebay advertised that way that turned out to be 590s.
 
They should be giving you the I.S.O size which specifies the bead seat diameter. That clears up any confusion.
From Sheldon Brown:

"Designating the width with a fraction instead of a decimal usually signifies a straight-sided rim, not a hook-edge rim. The rim/tire diameter is also slightly different. Let the tire buyer beware! There are similar problems with other Schwinn tire sizes. The most common difficulty is that the Schwinn 26 x 1 3/8 (I. S.O. 597 mm) interchanges with the British 26 x 1 1/4, not the British 26 x 1 3/8 (I. S.O. 590 mm)."
 
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