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Old 08-12-18, 02:53 AM
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Inch sizes are tricky. There is often several non-interchangeable ones lurking under the same - or very similar - designations.
Its safer if you can find the ISO/ETRTO millimeter size.
You HAVE to match the Bead Seat Diameter - where rim and tire overlap.
20x1 3/8 comes up as a BSD of 451 mm, while a 20x1.75 is likely to be a
406 mm BSD.
There may be others.
Read here for more:
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