Bike inner tube size

rockape

rockape

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I have to replace a tube on the wife's bike, rim of the wheel is stamped 20x559. But most I have looked at on eBay show what appears to be metric ,e.g. 20 X 1.75 .
Do any of you lot know what the equivalent size is???
 
The tyre (If present) should have its size marked on it. The tube should match.
Tube size 20 x 1.75 isn't metric, it's imperial, ie 20"diameter tube x 1.75"tube width.
To me that looks like a folding bike type tube size.
Within limits a rim can take tyres of differing widths but obviously only one diameter size.
 
rockape said:
Werner Von Braun would have trouble find a tube for his bike using this guide.
Click to expand...

He sure would it's well beyond Rocket Science!

It's a bit like car wheels/tyres diameters in inches widths in mm
but not without exception, aspect ratios in....ratios. Imperial Metric
feckup goes back 140 years.
 
as long as the diameter is correct for the wheel rim the the width of the tube isnt critical, within reason, a thinner tube will stretch a bit and a wider one wont be as stretched the tyre will limit it and hold it together.
 
Did you get your 2.0" X 559mm (26") tube ok?

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Tube size

Look on the side of the tire. 20 x 1.75 or 20 x 2.00 show a diameter of 20 " and widths of 1.75 or 2.00 cms. The same tube would fit either. If it reads 20 x 11/8 - an older type of folding bike perhaps you need a tube that is imperial in dimensions!
 
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