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The 406 mm (20" decimal) size fits most 20" bikes.
This does not fit fractional sized tires such as 20 x 1 1/8, only tires marked in a decimal width, such as 20 x 1.75.
The 1.5- 1.75 fits the 20 x 1.4 to 1.75 tire size.
The 1.9-2.125 width tube is the standard size for tires marked 20" x 1.9", 2.0", or 2.125".
Since tubes are stretchy, they do not need to exactly match the size of the tire.
Depending on stock, size shipped may not be exactly the same as listed in the pull-down menu.
Standard Schrader valves, the same as used on automobiles.
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