All our advice on choosing an inner tube for your bike or mountain bike, from the type and length of valve to the type of material used!

It's one thing to choose a bicycle or mountain bike inner tube, but it's another to choose the right one. In fact, choosing the right cyclocross inner tube for a road bike or mountain bike requires several technical criteria to be taken into account. These criteria ensure compatibility with other components, such as the bike wheel and tyre, but also guarantee performance and reliability.|>

The type of inner tube valve

Before looking at the more technical criteria relating to air chambers, we must first focus on the type of valve. Among standard bicycle valves, the Presta and Schrader types are the most common on the market.

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The Presta valve

The Presta valve is also known as a small valve, French valve or Sclaverand valve. These valves are very common on road bikes and are designed for wheels with a 6 mm valve stem.. However, they can be used on auto-type rims, although this installation exposes the base of the valve to the risk of tearing. The Presta valve is available in various lengths to suit different rim profiles. On very high-profile rims, it is also possible to use a valve extender.|>

The Schrader valve

The Schrader valve is also known as an Auto valve or large valve. This type of valve, with a diameter of 8 mm, is more common on mountain bikes and cannot be installed on a Presta-type rim. It is also available in different lengths depending on the rim profile.|>

Italian and German valves

The German valve or Dunlop valve is less common on the market. The same applies to the Italian or Regina valve.

Bicycle inner tube dimensions and tolerance

The size provided on the packaging of an inner tube corresponds exactly to that of the bicycle tyre for which it is intended. These dimensions correspond in most cases to the measurements of the section and internal diameter of the tyre in millimetres, as well as their ETRTO (European Tyre and Rim Technical Organisation) equivalent.. The tolerance of the inner tube defines its compatibility with cyclo-cross, road bike or mountain bike tyres. For example, you may find a mountain bike inner tube that is 26x1.75/2.125 (ETRTO: 47/57-559). These values indicate that the inner tube is compatible with 26-inch mountain bike tyres with a section width of 1.75 to 2.125 inches or 47 to 57 mm.|>

Composition: butyl or latex

The composition of the inner tube is one of the main factors affecting both performance and reliability. As such, inner tubes are made from either latex or butyl rubber.

Butyl rubber air chamber

The use of butyl rubber strips allows manufacturers to produce thicker air chambers, which are therefore more resistant to punctures and pinches. They are also more airtight and less susceptible to pressure loss. However, the thickness of the rubber affects the total weight of the wheel once mounted. The difference in weight between a latex inner tube and a rubber inner tube can be as much as 100 g.weight difference between a latex inner tube and a rubber inner tube can be as much as 30 grams, depending on the model. This extra weight inevitably affects performance and increases rolling resistance.|>

Latex inner tube

For its part, the latex chamber boasts the advantages of lightness and flexibility. Its lightness is an undeniable advantage in terms of wheel performance. The flexibility of latex also allows it to fit perfectly against the tyre wall, the rim and the rim base. This factor eliminates any irregularities and gaps between the inner tube and the tyre, significantly reducing rolling resistance. However, fitting a latex inner tube requires a certain amount of expertise. Due to its flexibility, some of the latex can slip under the rim, causing the inner tube to come into contact with the rim.latex inner tube still requires a certain amount of expertise. Due to its flexibility, some of the latex can slip under a poorly positioned rim or be pinched by the tyre beads. To fit the latex inner tube correctly, it is advisable to inflate it slightly.

Latex inner tubes are also not the most effective in terms of airtightness, especially when inflated with CO2. It is therefore essential to check the tyre pressure regularly, especially before each ride. Latex inner tubes also require special care when handling. Contact with bike cleaning products, lubricants and degreasers can affect the latex and cause it to lose elasticity and weaken the membrane., loss of elasticity and weakening of the membrane.

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Technology and additional options

In addition to the basic features, additional technologies and options allow you to refine your choice of bicycle inner tube. For example, high-end Michelin air chambers for mountain bikes are equipped with a self-repairing feature in the event of a puncture. Other manufacturers rely on pre-injecting a preventive liquid into the tube to improve its reliability or use an exclusive composite material to create the membrane. Taking into account the advantages, disadvantages and characteristics of each type of air chamber, some models are clearly indicated for off-road use, while others are more suitable for road use.off-road use, while others are more suitable for road use.For high-level or advanced road cyclists or cyclo-cross riders, latex inner tubes are the ideal solution as they significantly improve performance. However, the robustness and ease of installation and maintenance make rubber inner tubes the ideal product for training and cycle touring. On a mountain bike, where resistance to wear and tear, rubber remains the ideal alternative. Rubber inner tubes are more resistant to the stresses of difficult terrain, as well as requiring less maintenance and pressure checks.