Bicycle Inner Tube Stem Types

The humble inner tube may be one of the simplest parts on your bike but with a wide range of sizes different valve types and a choice of materials choosing the right tube isn t necessarily as. Learn the difference between presta and schrader valve stems on bicycle tubes and how to use different pumps to inflate them. Bicycle tires and inner tubes are sold in a variety of diameters.

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Bicycle inner tube stem types. Presta valve inner tube. What is a bicycle inner tube. The inner tube is inflated beneath the tire as acts as air cushion providing you with a safe comfortable ride. There are limits though.

The valve stem opens by unscrewing a knurled textured nut at the top. Let s start with the basics what are inner tubes. An inner tube with too large a diameter will fold over inside the tire. An inner tube is a balloon like structure that is inflated and deflated through a valve.

For example the same inner tubes are used with tires in the e t r t o. These valves are quite narrow and have a screw at their valve tip. 630mm english 27 inch and 622mm french 700c sizes. Unlike a schrader the system doesn t use a check valve it seals entirely based on pressure in the tube or tire.

Inner tube valve types. Because inner tubes stretch the fit can be inexact. Most bikes come with wheels that use presta valved tubes.