If your tire valve is on the bottom of the wheel or your wheels are small, you're good to go. However, if your tire valve is on a larger tire, e.g. an 18" tire, the extension is too short to reach, even when attached to a portable compressor hose. Buy the 23-inch version instead. It costs $3 more, but it's worth it as long as you don't mind holding the compressor in your hand for as long as it takes to fill a tire.