The Klic CO2 Inflator Head from Crank Brother is compact, simple and easy to use, which makes it a popular option for many road and mountain cyclists. It is packaged here with two threaded 16g CO2 cartridges for solid value.

With a composite outer design that insulates your hand from the instant severe cold effected by CO2 release, this Presta valve only inflator head has push-on, spring based actuation, meaning you can thread your cartridge into the Klic, then push the whole assembly down onto the open Presta valve. When you compress the spring, it releases the air into your tube/tire. One 16g cartridge is generally appropriate for one road tire inflation.