Road Bike Tire Tube Sizes

Road bike tube sizes road bikes and some flat bar commuters are shown as having a size of 700c this comes from an old french system referring to the tire diameter of 700mm or about 27. These would usually be measured in inches 26 27 etc or millimeters 650 700 etc. To confuse matters further all tyres use the european tyre and rim technical organisation etrto system so for a road it would display 622 x nn with the nn value indicating the tyre width which is the same as 700 x nn.

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For example if an inner tube says it s best for 26 x 1 95 2 125 that means the tube should be used for a 26 inch tire with a width between 1 95 and 2 125 inches.

Road bike tire tube sizes. Some road bikes use 700c tires which use millimeter sized inner tubes. Mtb wheels in particular can be further categorised by 26 inches 27 5 inches and 29 inches. Generally bike tire sizes are indicated with two numbers that correspond roughly to the outside diameter of the tire and the width of the tire. Some older road bikes still have the 27 inch size.

There are a myriad of wheel sizes for road mtb touring and children s bikes. Mountain bike tyre sizes are usually stated in inches. Common road bike widths in millimeters come in sizes ranging from 18 to 23 with a typical road bike tire at 700 x 23. Because of the high pressure and desired low rolling resistance road tires come in narrow widths.

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.