Problem with replacing inner tube of old bicycle with tire code: 47-559 (26 x 1.75)

Question

I'm replacing the inner tube of old bicycle with tire code: 47-559 (26 x 1.75).
I bought a new tube that has spec: 26*1.75 - 2.125 (47/57- 559).
However, the diameter of the new inner tube is too large, such that it can't fit (folded inside the tire). It is also obvious that the new inner tube has larger (in diameter) than the rim.
I've read the previous post and also https://sheldonbrown.com/tire-sizing.html#iso.
I thought that using the same ISO code (47-559), I would get the correct diameter, but it isn't.
Then I realized, there's a code 26 x 1.50 on the old inner tube.
Can anyone help me with this matter? Is this mean that I can't use the ISO code (47-559) for finding a replacement?

Argenti Apparatus · Accepted Answer

A 26 * 1.75-2.125, 47/57-559 tube should be fine for a 26 x 1.75, 47-559 tire.
Tubes can appear to be a little floppy and oversized on a rim before inflation. Remember the tube expands radially inwards and well as outwards as its cross-section diameter increases as it is inflated. Try inflating the tube a little before inserting it between tire and rim - this helps prevents folds and twists.

Problem with replacing inner tube of old bicycle with tire code: 47-559 (26 x 1.75)

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