8 Mistakes When Installing Tubeless Tires and How to Avoid Them

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If you’re a cycling enthusiast like me, you know that tubeless tires can be a game-changer. They provide a smoother ride, fewer flats, and other benefits. 

However, improper installation can lead to frustrating issues down the road. In this article, I’ll share some essential tips to ensure a hassle-free tubeless tire installation.

Based on my experience, I’ll share tips to help you avoid my mistakes.

8 Common Mistakes When Installing Tubeless Tires

When it comes to tubeless tire installation, getting it right from the start is crucial. Here are some common mistakes to avoid:

1. Use of a Poor-Quality Rim Tape

One of the most overlooked aspects of tubeless tire installation is rim tape. Using too narrow or low-quality rim tape can lead to air leakage, requiring tire removal and cleaning the sealant before retaping.

Invest in high-quality tubeless rim tape up to 5mm wider than your rims’ internal rim width. I learned this the hard way—I wanted to save money on tape because I frequently test a large number of wheels.

Unfortunately, cheap tapes failed me during installation. They bubbled and allowed air to seep through.

NOTE: Some rims don’t have nipple holes, so you can use them without tubeless rim tape.

2. Making an Oversized Valve Hole in the Rim Tape

Making the valve hole too large in the rim tape can lead to air leaks. Although it happened to me only once, it took me a while to diagnose.

So I had to retape the valve hole and make it smaller. I may have also contributed to the problem by not seating the valve properly. 

To cut the hole for the valve, use kitchen scissors, a razor blade, or another sharp object. Just be careful not to cut too big hole.

3. Over-Tightening the Valve Secure Nut

While it’s important to secure the tubeless valve, over-tightening the nut (with calipers, for example) can damage the valve and make it impossible to untighten it while you’re on the road.

Although you probably won’t change the valve itself, if it is the one that fails and you are unable to release it, your ride will be over.

This mistake is more problematic when you need to replace a punctured tube where the valve is integrated into the tube. The nut must be finger-tightened just enough to keep it from loosening.

4. Installing the Tire Against the Direction of Travel

Installing the tire against the direction of rotation reduces traction and handling.

Always check the tire’s directional arrows and mount it correctly to maximize performance. 

Did you know that some tires are directionless?

5. Premature Use of Tire Levers

Using tire levers too aggressively or too early during installation can damage the wheel decals or rim tape. A little patience here can save you from potential damage.

Describing the correct tire-mounting technique deserves its own article. However, in short, I recommend the following technique:

1. Fit one side of the tire first (starting opposite the valve). 
2. Ensure the tire bead is in the rim’s center so the tire will be looser.
3. Fit the other side of the tire (starting opposite the valve again). As the fitting becomes more difficult, start pushing both tire beads into the rim’s center from where you started.

However, some tire and rim combinations are too tight to fit without tire levers. So don’t be shy about using them. Just be careful.

6. Pouring Sealant at 12 or 6 o’clock Positions

When pouring tire sealant into your tubeless tire, avoid the 12 or 6 o’clock positions. Instead, aim for the 3 or 9 o’clock positions (especially if you try to install road tubeless tires).

This prevents the sealant from flowing out of the tire at the top positions. 

In the 3 and 9 o’clock positions, it will run down to the bottom of the tire, making its application cleaner.

7. Inflating with Valve Core Installed

Remove the valve core before inflating with an air compressor or pump. Inflating with the core installed makes it difficult to achieve the desired pressure and can damage the valve. 

Once the tire is seated on the rim, reinstall the valve core and inflate to the desired pressure. Fast airflow from your compressor helps seat the tire quickly. 

8. Use of Seals on Rims Without Second Chamber Safety Hole

Many tubeless valves come with secure bolt nuts and seals. However, I recently learned that the seals are unnecessary and can do more harm than good.

First, because they won’t prevent air leaks anyway, and second, when they do work, they prevent air from escaping the second chamber of the rim. 

This can be a problem, especially with carbon rims. The air pressure in the second chamber can lead to damage or even a tear in the rim. Unlike the first chamber, the second chamber is not built for high pressures.

For these reasons, many manufacturers drill a small hole in the second chamber to prevent it from becoming overpressurized.

9. Not Removing the Dried Tire Sealant from the Old Tire

Always remove the dried tire sealant from the old tires, especially the tire beads. Otherwise, you risk tire leaks and improper tire seating.

You can use either a sealant remover or sandpaper (trust me, it works, but it requires some elbow grease).

Conclusion

Mastering tubeless tire installation will save you tons of time and money in the long run. First, you won’t have to go to the bike shop for every tire change. Second, you’ll know what to look out for and save time on the installation itself. 

However, my biggest hack (besides the above tips) was getting an air compressor. It will compensate for minor mistakes while making tubeless tire seating simple. For the best results, you need to pressurize the compressor to at least 4 bars and use a nozzle that allows a lot of airflow.

If you have any tips, please share them in the comments. You can learn more about tubeless tires in this article.