What Size CO2 Cartridge for a Mountain Bike?

Are you an avid mountain biker who is searching for the perfect size CO2 cartridge to take on your next adventure? Look no further! Choosing the right size CO2 cartridge can make all the difference in a pinch, and we’re here to help. In this blog post, we’ll break down everything you need to know about choosing the best size CO2 cartridge for your mountain bike adventures. So grab your helmet and let’s dive in!

What is a CO2 cartridge for mountain biking?

A CO2 cartridge is a small canister of compressed carbon dioxide gas. They are commonly used to inflate tires on mountain bikes. CO2 cartridges are much smaller and lighter than traditional air pumps, making them ideal for carrying on long rides or when space is limited.

When choosing a CO2 cartridge for mountain biking, it is important to consider the size of your tires. Most cartridges will list their compatible tire sizes on the packaging. It is also important to think about how many tires you need to inflate. If you only need to inflate one tire, a small 16g cartridge should be sufficient. However, if you need to inflate multiple tires or have larger tires, you may need a larger cartridge such as a 25g or 33g.

Once you have selected the right size cartridge, simply screw it into your Tire Inflator and follow the instructions that came with your inflator. When using a CO2 cartridge, it is important to be careful not to overinflate your tires as this could cause them to burst.

What Size CO2 Cartridge for a Mountain Bike?

What Size CO2 Cartridge for a Mountain Bike?

CO2 cartridges are a convenient and efficient way to inflate a flat tire on a mountain bike quickly. However, it’s important to choose the right size cartridge for your tire to ensure that you have enough gas to fully inflate the tire.

In general, a 16-gram CO2 cartridge is sufficient for most mountain bike tires. This size is suitable for tires with widths of up to 2.5 inches. However, if you have larger tires, such as those with widths of 2.5 inches or more, you may need a 25-gram cartridge or even larger.

It’s always a good idea to check the size of your tire before choosing a CO2 cartridge size. You can do this by looking at the sidewall of the tire, which will provide information on the tire size and width. Additionally, some manufacturers will provide information on which cartridge sizes are recommended for their tires.

It’s also a good idea to carry more than one CO2 cartridge with you on a mountain bike ride. This is because if you need to inflate more than one tire or if the first cartridge doesn’t work properly, you’ll have a backup option. It’s also important to note that you should not reuse partially used CO2 cartridges, as the gas will escape once the cartridge has been punctured. It’s best to use a new cartridge each time you need to inflate a tire.

Using a CO2 cartridge to inflate your tire is a simple process. First, you’ll need a CO2 inflator head, which attaches to the valve stem on your tire. Screw the inflator head onto the cartridge, then onto the valve stem, and release the gas into the tire. Be sure to follow the instructions on your specific inflator head and cartridge.

It’s important to handle CO2 cartridges carefully as they can become very cold when the gas is released. Wear gloves or wrap the cartridge in a cloth before using it, and be sure to dispose of used cartridges properly.

Top 3 CO2 Cartridge Sizes

When it comes to CO2 cartridges, size definitely matters. The larger the cartridge, the more air it can inflate your tires. But, of course, that also means that it’s going to be heavier and take up more space. So, what’s the best size for you? Here are the top 3 sizes of CO2 cartridges:

-16g: This is a great all-around size. It’s not too big or too small, so it’s perfect for carrying in your bag without taking up too much space. Plus, it can inflate 2 mountain bike tires with no problem.

-25g: This size is perfect if you want to be able to inflate your tires quickly. It can do 2 mountain bike tires in about 60 seconds flat. However, it is a bit larger and heavier than the 16g size, so keep that in mind when deciding which one to choose.

-50g: This is the largest size of CO2 cartridge and is meant for race day only. It can fill up 2 mountain bike tires extremely quickly, but it is very bulky and heavy.

How to choose the right CO2 cartridge size?

When it comes to choosing the right size CO2 cartridge for your mountain bike, there are a few things to take into consideration. First, you’ll need to know what size tire you have. Mountain bike tires typically range from 26″ – 29″. Once you know your tire size, you can then determine how much air you need to fill them.

For example, if you have a 26″ tire, you’ll need about 60psi of air. So, if you’re using a 16g CO2 cartridge, it will fill your tire up to about 60 psi. If you’re using a 25g cartridge, it will fill your tire up to about 100psi. As for what size is best for your purposes, that’s entirely up to you and what feels comfortable for you.

If you’re just getting started with mountain biking, it’s probably best to start with smaller cartridges so that you can get a feel for how they work and how much air they put into your tires. Once you have a good understanding of that, then you can move up to larger cartridges if you feel like you need more air or if you want to save time when filling up your tires.

Are there any safety precautions I should take when using a CO2 cartridge for mountain biking?

Yes, there are some important safety precautions you should take when using a CO2 cartridge for mountain biking. Here are a few:

  1. Wear gloves: CO2 cartridges can become very cold when the gas is released, which can cause frostbite or skin damage if they come into contact with your skin. Wear gloves or wrap the cartridge in a cloth before using it.
  2. Use in a well-ventilated area: CO2 is a colorless, odorless gas that can be dangerous in high concentrations. Use your CO2 cartridge in a well-ventilated area, and avoid inhaling the gas directly.
  3. Dispose of used cartridges properly: CO2 cartridges are single-use only and cannot be refilled. Dispose of used cartridges in a proper recycling or waste container.
  4. Check the expiration date: CO2 cartridges have a limited shelf life and can lose pressure over time. Check the expiration date on your cartridge before using it, and replace it if it is expired or damaged.
  5. Carry a backup option: While CO2 cartridges are a convenient option for inflating your tires quickly, it’s always a good idea to carry a backup option, such as a mini-pump or a patch kit, in case you run out of cartridges or experience other issues.

By taking these safety precautions, you can safely and effectively use a CO2 cartridge for mountain biking.


In conclusion, the size of the CO2 cartridge for a mountain bike is dependent on the type and volume of tire you are inflating. If you choose correctly, it should be just enough to inflate your tire back up to its ideal pressure level. Remember that different tires have vastly different suggested pressures, so always check with your manufacturer or refer to any online resources before purchasing a cartridge. With these tips in mind, you can pick the right one and get back out on the trails quickly!