XLAB's Speed Chuck Inflator is the ultimate CO2 bicycle tire inflator and pump. It's tiny, super light and inflates tires fast to get you back on the road. Simply thread on a CO2 cartridge (sold separately), place the Speed Chuck on your valve and push it down to inflate. When you let go, it stops inflating, and you've got a full tire in seconds. This easy-to-use design lets you control how much pressure you put in your tire every time. Plus, it's constructed of light and durable aluminum and boasts a low-profile head that fits regular and disc wheels and all valve types, too.