When, how, and why should you know how much sealant is left in your tubeless tire?

Tubeless is the freedom of riding without an inner tube, but also the responsibility of keeping the system sealed. And one of the key elements of this seal is the sealant. But how do you know if there’s enough left? When should you add more? And why is it so important?

By Jeff Tatard – Photos: DR

Why is sealant essential?

Sealant ensures the tire’s seal on the rim when mounted without an inner tube, and seals small punctures, thus maintaining pressure and preventing flats. Over time, this liquid can dry out, lose its effectiveness, and no longer fulfill its role. It is therefore crucial to regularly check its level and condition.

When to check and add sealant?

As a general rule, it is advisable to check the sealant level every 2 to 6 months, depending on your frequency of use and climatic conditions. In summer, with heat and a drier climate, the liquid dries faster, so it is recommended to replace it before the usual deadline.

How to know if it’s time to add sealant?

Here are some signs that it’s time to add sealant:

• Absence of sloshing sound: when you shake the wheel, if you no longer hear the characteristic sound of the liquid, it’s a sign that it’s probably dry.
• Frequent pressure loss: if you notice a faster-than-usual pressure loss, this may indicate that the liquid is no longer fulfilling its role.
• Presence of dry residue or uncovered areas: by slightly deflating the tire and visually inspecting it, if you notice dry areas or residue, it means the liquid is insufficient.

How to add sealant?

• 1.Slightly deflate the tire: this releases pressure and facilitates access to the valve.
• 2.Remove the valve core: use an appropriate tool for this.
• 3.Insert a graduated syringe: this will allow you to measure the exact amount of liquid to add.
• 4.Inject the sealant: generally, for a 29-inch MTB tire, it is recommended to add between 80 and 100 ml of liquid. For a road bike, it’s around 40 ml.
• 5.Reinstall the valve core: make sure it is securely in place.
• 6.Inflate the tire to the desired pressure: this allows the liquid to be evenly distributed inside the tire.

In summary

Maintaining an adequate level of sealant in your tubeless tires is essential to ensure a safe and hassle-free ride. By regularly checking and adding liquid when necessary, you extend the lifespan of your tires and improve your cycling experience, while reducing the risk of trouble on the road.

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