Bike Inner Tube Sizes Explained

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. 27 5 x 1 9 2 3 for example. 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. The diameter needs to be the same e g. 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. 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. 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.

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. This is the reason why you see inner tubes listed with one number for the diameter and a range for the width e g. 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. The width of your tire 1 95 inches falls within the range of the widths displayed on the tube.

Inner tubes vary in size depending on the circumference of the wheel and the width of the tyre. 700 or 26 but the tube s width will vary depending on the amount you inflate them like a kid s balloon. Tubes because they can stretch will list a range of widths. A narrower inner tube will balloon.

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. Then within these categories there are further sub divisions such as 26 inch 27 5 inch and the 29ers commonly.