Old American Tire size


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PatrickZ

On Training Wheels
Apr 9, 2015
2
0
#2
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.
 

Eric Amlie

Finally riding a big boys bike
May 9, 2010
362
338
Madison, United States
#5
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)."
 

Roger Henning

Finally riding a big boys bike
Dec 2, 2018
200
122
70
Sharon Wisconsin
#6
Nor does it interchange with prewar Schwinn 26 x 1.375 which are 599 bead seat tires. Roger
 

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