A 20g threaded CO2 cartridge is a small, portable, and easy-to-use option for inflating bike tires on the go. These cartridges are filled with compressed carbon dioxide and can be used with a compatible inflator head to quickly inflate a tire to the desired pressure. A 20g cartridge typically provides enough air to inflate a standard road bike tire to around 100 psi or a mountain bike tire to around 40 psi. Threaded CO2 cartridges are a popular choice among cyclists because they are lightweight and take up very little space in a saddlebag or jersey pocket, making them a convenient option for emergency tire repairs or quick inflation during a ride.