Airing down can be done using many different tools. We’ve aired down thousands of times, often using a key or a small rock to let air out of the tire when nothing else is available. We’ve also used valve core tools to remove the valve core to let air out. All of these work, with the latter being much faster, but it also includes the danger of letting too much air out or losing the valve core. We also like deflators like this one from ARB. Once you’ve figured out how to use them, they are a great tool, release air fast, and capture the valve core so it can’t launch like a tiny missile. There are also automatic deflators, balance hoses, and special valves that require special holes in your wheels, depending on how fancy you’d like to get.