Why does my bike tire tend to deflate?

After leaving your bike in the garage for a while, you decide to pull it out. You make sure everything is okay. Only at the level of the tires, you notice a slight loss of pressure. You wonder if this is normal? … Know that the answer is yes! Today, we explain why a bike tire deflates on its own.

Why does my bike tire tend to deflate
Why does my bike tire tend to deflate

Loss of pressure is inevitable. You have already seen it if you have stayed long enough without using your bike or if your tires have not been regularly inflated. If you are wondering what this is due, here are some answers to help you understand.

Light tire pressure loss

The answer is simple. Everything is just a matter of physics. The pressure of a bicycle tire decreases because of the composition of the air that contains nitrogen and oxygen. Oxygen molecules that can escape from your tire. You should know that a flat tire is not always a puncture. If you have not re-inflated it for a long time, your tire will tend to deflate. This happens just because the oxygen molecules will have gradually escaped from it.

This phenomenon is stronger during the summer because of the heat. The air in the air chambers expands and accentuates the pressure losses. Moreover, this is valid for any tire. For now, there is no way to prevent this oxygen leak if your tire remains stored for some time.

What does this loss of pressure entail?

It should also know that he advised to always roll with properly inflated tires. Sure enough, driving with under-inflated tires will significantly impact on your performance. This will push you, for example, to provide more effort on your bike. The risks of a puncture are also higher.

Similarly, the risks of detangling or falling increase. Too low pressure is more detrimental to the life of your tires. Under-inflated, these will indeed wear out faster. Their flanks may also become brittle and crack faster, causing you to have to replace them prematurely.

What to do to optimize your tire inflation?

In general, the pressure loss of a tire is estimated to be one bar per month. To avoid all risks, it is always advisable to check before going out. For this test, use the gauge on your bike pump. If necessary, re-inflate your tires to maintain proper pressure.

  • Do not forget to unblock the valve of your inner tube before inflation. This is a step not to jump for a proper inflation of your tires.
  • For an inner tube with a Presta valve, release this valve by unscrewing the nut largely. Then press the valve to chase some air from the chamber before reinflating it.
  • If you are equipped with a Shrader valve, push the small point in the center of the lid with your finger or a small object. Also, allow some air to escape before inflating.

The right pressure for a bike tire

Remember that for optimum use of your bike, you must inflate your tires at the correct pressure. However, it remains to this day quite difficult to define a rule determining the ideal pressure of a tire. Indeed, to guarantee this maximum pressure, many parameters have to be taken into account. For example, you should consider your weight, your practice or the section of the tire.

However, to help you, you can first check the data provided by the manufacturer of your tire. This will allow you to learn more about the recommendations. Observe the maximum, and minimum limits indicated. In general, the larger your tire is, the less it will be necessary to inflate it.

As for your weight, the higher your weight, the higher the pressure you will need. In all cases, always refer to the information given on your tire. Try as much as possible to give them pressure between the minimum and maximum values ​​provided.

To conclude, a slight loss of pressure of your tires is therefore quite reasonable. If this happens, do not immediately think of a puncture. Carry out a small check and above all remember to always re-inflate to minimize the risks during your exits.


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