In the previous example a tube labeled 26 x 1 9 2 125 has the correct diameter of 26 inches.
Bike inner tube sizes explained.
How to get the right bike tube and valve size.
Bike tube sizing essentially mirrors bike tire sizing with one exception.
The diameter needs to be the same e g.
27 5 x 1 9 2 3 for example.
700 or 26 but the tube s width will vary depending on the amount you inflate them like a kid s balloon.
Inner tubes typically state a wheel diameter and width range for which they will work e g.
Mountain bike tyre sizes are usually stated in inches.
A narrower inner tube will balloon.
Because inner tubes stretch they typically come in a range of widths.
Common inner tube ranges for 26 inch 27 5 inch and 29 inch tire diameters 1 0 to 1 15 inches 1 25 to 2 0 inches 2 0 to 2 35 inches 2 4 to 3 0 inches.
Depending on whether your bike is a road bike touring bike mountain bike or child s bike the diameter and circumference of the wheel can vary.
All inner tubes will come with a recommended range for tyre width for example 700 20 25 for traditional road tyres 700 25 32 for wider road tyres.
Inner tubes vary in size depending on the circumference of the wheel and the width of the tyre.
This is the reason why you see inner tubes listed with one number for the diameter and a range for the width e g.
Then within these categories there are further sub divisions such as 26 inch 27 5 inch and the 29ers commonly.
The width of your tire 1 95 inches falls within the range of the widths displayed on the tube.
Thus you need to be sure any new bike tube has sizing that has a width range that aligns with the sizing on your bike tires.
Tubes because they can stretch will list a range of widths.