A CO2 inflator is a compact device used primarily for inflating tires on bicycles and other vehicles. It works by releasing compressed carbon dioxide gas from a small cartridge into the tire, quickly filling it with air. This is especially useful for cyclists who need a fast and efficient way to fix flat tires while on the go. These inflators are lightweight and portable, making them easy to carry in a backpack or attached to a bike frame. They typically come with a nozzle that connects to the tire valve, allowing for a straightforward inflation process. Many cyclists prefer CO2 inflators over traditional hand pumps for their speed and convenience.