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Sometimes your ride doesn’t end because of your legs — it ends because of a flat. And nothing ruins a weekend ride faster than realizing you don’t have enough CO2 to get back on the trail.
A mountain biker typically needs 1–2 CO2 cartridges for a single ride, depending on tire size, pressure, and terrain. Carrying a spare is essential for emergencies.
A flat is never planned, but being underprepared is a choice. The right number of CO2 cartridges can mean the difference between finishing your ride and a long walk home.
How Do I Know How Many CO2 Cartridges to Carry?
If you’re riding with just one 16g CO2 cartridge, you’re gambling. Trails can be rough, and one puncture repair often isn’t the end of your problems.
Most riders carry at least two CO2 cartridges — one for the first repair and one as a backup. Here’s why that’s the smart move:
Factors That Affect Cartridge Needs
| Factor | Impact on Cartridge Use |
|---|---|
| Tire Volume | Fat and plus-size tires need more gas per inflation |
| Riding Conditions | Rocky trails increase puncture risks |
| Rider Preparedness | Extra cartridges = more confidence |
| Cartridge Size | 20g cartridges inflate more volume than 16g |
| Repair Skill | Poor plug or patch work can waste gas |
Choosing the Right Cartridge Size
16g vs. 20g — Which Is Better?
- 16g: Common, lightweight, enough for most 27.5” or 29” tires to get to ~25–30 PSI.
- 20g: Heavier but ideal for high-volume tires or riders who prefer 35+ PSI.
My Riding & Supplying Rule of Thumb
When I first started mountain biking, I thought one cartridge was enough. Then I double-flatted on a long trail in summer heat — lesson learned. Now, as both a rider and a supplier of bicycle CO2 cartridges, I always pack:
- Two 20g cartridges for big rides
- One inflator head that works with both threaded and non-threaded
- A mini pump as a last resort
This setup covers my needs as a rider and reflects the feedback I hear from customers in the cycling industry.
How to Store CO2 Cartridges for Trail Use
Keep them in a small saddle bag or tool roll. Avoid leaving them in direct sun or in your car for long periods — heat can increase internal pressure and risk failure.
Pro Tip for B2B Buyers
If you supply CO2 cartridges for outdoor sports, stock both 16g and 20g threaded versions. Mountain bikers value compatibility with their inflators and appreciate bundle packs that include 2–3 cartridges plus an inflator head.
Conclusion
Two cartridges per ride is the safe bet — one to fix, one as backup. If you’re riding far or on rough trails, bring more. You’ll never regret having too many, but you will regret having too few.
