Bike Inner Tube Sizes Explained

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. Tubes because they can stretch will list a range of widths.

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Bike inner tube sizes explained.

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. The diameter needs to be the same e g. Mountain bike tyre sizes are usually stated in inches. 27 5 x 1 9 2 3 for example.

This is the reason why you see inner tubes listed with one number for the diameter and a range for the width e g. The width of your tire 1 95 inches falls within the range of the widths displayed on the tube. 26 x 1 95 2 125 indicating that the tube is intended to fit a 26 inch tyre with a width of between 1 95 inches and 2 125 inches. 700 or 26 but the tube s width will vary depending on the amount you inflate them like a kid s balloon.

Then within these categories there are further sub divisions such as 26 inch 27 5 inch and the 29ers commonly. Inner tubes vary in size depending on the circumference of the wheel and the width of the tyre. Inner tubes typically state a wheel diameter and width range for which they will work e g. Because inner tubes stretch they typically come in a range of widths.

A narrower inner tube will balloon. So a 29 inch mtb tube will have the same diameter as a 700c road wheel while a 27 5 inch tube will be the same diameter as a 650b road wheel. Bike tube sizing essentially mirrors bike tire sizing with one exception. For example one of our most popular tubes is the 26 x 1 75 2 125 which means it fits a 26 inch diameter tire with a width in the range of 1 75 to 2 125 inches.

In the previous example a tube labeled 26 x 1 9 2 125 has the correct diameter of 26 inches. 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.