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How to change your bike's inner tube: a complete guide.
A tire flat can turn a pleasant bike ride into a real nuisance. Good news? Changing the inner tube is a simple operation that anyone can learn in a few minutes.
In this guide, you will discover how to choose the right inner tube, which tools to use, how to replace it even on bikes with disc brakes or e-bikes, and all the tips to carry out the work correctly.
How to choose the correct inner tube for your bike?
First of all, the inner tube must be compatible with the tire, and to understand this, you need to consider three elements:
- the wheel diameter
- the tire width
- the valve type.
Each inner tube indicates a compatible size range. For example, a tube indicated as 700x25-32C is suitable for 700C tires with a width between 25 and 32 mm.
If you are using an MTB, you might find sizes like 29x2.10-2.40 or 27.5x2.20-2.50.
It is important not to choose a tube that is too small or too large: an overly stretched tube will be more prone to punctures, while one that is too wide will tend to create folds inside the tire.
How to read and measure the dimensions of an inner tube?
Dimensions, found on the side of the tire, can be indicated by different standards. The most common are:
- ETRTO system (e.g., 37-622);
- inch measurement (26x1.95);
- French measurement (700x28C).
What are the different types of valves and inner tubes available?
There are three most common types of valves.
1. Presta Valve (French)
Thin, used on road bikes and gravel bikes, and works with high pressures.
2. Schrader Valve (American)
More robust and very common on MTB, city bikes, and e-bikes.
3. Dunlop Valve
Found mainly on traditional or city bikes.
Additionally, there are inner tubes made of different materials:
- butyl -> the most common and economical
- latex -> lighter and more performant, but require frequent inflation
- TPU -> extremely light and compact, increasingly popular among sport cyclists.
When is it necessary to replace the inner tube and how long does it last?
An inner tube can last several years if it does not suffer damage; however, it is advisable to replace it when: it has multiple punctures, the rubber becomes dry or cracked, the valve is damaged, and/or repairs are becoming numerous.
If the puncture is single and the tube is in good condition, a quality patch can easily extend its life.
How to tell if the inner tube is punctured or if the valve is faulty?
If the wheel slowly loses pressure, the cause can be of two types. To understand this, it is advisable to: inflate the tube, immerse it in water, and observe the presence of bubbles:
1. If bubbles come from the tire rubber, the tube is punctured.
2. If instead they come from the base or inside the valve, the valve itself might be faulty.
❗Also check that the tire and rim tape are intact.
What is needed to change the inner tube?
The indispensable tools for changing an inner tube are:
✅ new inner tube
✅ repair kit (useful as an emergency)
For e-bikes, it can also be useful to have the appropriate wrenches to remove the wheel axle.
How to change the bicycle inner tube step by step?
In the case of the front wheel:
1. Remove the wheel
If the bike has a quick release, open it; if it uses nuts or thru-axles, unscrew them with the correct tool.
2. Deflate the tire completely
Even if the tube is punctured, ensure it is completely devoid of air.
3. Use the tire levers
Insert the first tire lever under the tire bead and hook it to a spoke. With the second, slide the edge until one side of the tire is freed.
4. Remove the inner tube
First remove the valve and then pull the tube out completely.
5. Check the tire
Before mounting the new tube, run your fingers slowly inside the tire and check that there are no: thorns, glass, metal wires, or shards.⚠️If any foreign object remains, the new tube will puncture immediately.
6. Insert the new tube
Slightly inflate it before mounting so that it keeps its shape and avoids folding.Insert the valve first, then distribute the entire tube evenly.
7. Remount the tire
Seal the tire, working preferably only with your hands.⚠️Use tire levers only if strictly necessary.
8. Inflate to the correct pressure
Check the pressure marked on the tire and inflate it without exceeding the indicated value.
In case of a rear wheel, before removing it you must:
1. shift the gear to the smallest sprocket
2. detach the wheel
3. gently guide the derailleur outwards.
4. follow the steps for the front wheel
How to use tire levers correctly without causing damage?
The tire lever is a simple tool, but it is often used incorrectly because, sometimes being metal, it damages the rim and the tube.
To avoid damage: use plastic tire levers, insert them only under the tire bead, avoid pushing deep where the tube is located, and do not leverage with excessive force.
Consequently, to avoid pinching the inner tube, we recommend:
- slightly inflate the tube before installation;
- insert it completely inside the tire;
- seal the tire mainly with your hands;
- check the entire rim before final inflation;
- inflate gradually, verifying that the tire rises uniformly on the rim.
How to change the inner tube on bikes with disc brakes or e-bikes?
The procedure is practically identical to that of traditional bicycles, but there are some precautions.
For bikes with disc brakes: avoid pressing the brake lever when the wheel is removed and be careful not to bend the disc.
For e-bikes: always turn off the bike, remove the battery when possible, disconnect any motor cables following the manual, and pay attention to the greater weight of the wheel.
Is it possible to change the inner tube without tools or without removing the wheel?
In some cases, it is possible to remove the tire using only hands, especially if it is very soft; however, having at least a pair of tire levers makes the operation much simpler.
Without removing the wheel, it is only possible to intervene on some specific models or using open inner tubes designed specifically, but on most bicycles, it is necessary to remove at least one wheel.
How to carry a spare inner tube during bike rides or MTB outings?
A spare tube takes up very little space and can save any ride; you can carry it: in a seat bag, in a small frame bag, in a backpack, in a pocket of a cycling jersey.
The ideal is to always combine it with:
- two tire levers;
- a mini pump or CO₂ cartridge;
- a repair kit;
- a multitool.
In this way, you will be ready to face practically any puncture.
Remember that prevention is important: regularly checking the condition of tires, maintaining the correct pressure, and always carrying a spare inner tube significantly reduces the risk of being stranded during a ride. Maintenance can make a huge difference, whether for short daily rides or long adventures on the road or trails.
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Messaggio pubblicitario con finalità promozionale. Offerta di credito finalizzato. IEBCC nel percorso online. Salvo approvazione di Findomestic Banca S.p.A. per cui “Ciclimattio S.R.L.” opera quale intermediario del credito, non in esclusiva.
Messaggio pubblicitario con finalità promozionale. Offerta di credito finalizzato. IEBCC nel percorso online. Salvo approvazione di Findomestic Banca S.p.A. per cui “Ciclimattio S.R.L.” opera quale intermediario del credito, non in esclusiva.