[header] How to let air out of a tire [title] Locate the valve on your tires. [step] The valve is usually found in between the spokes near the middle of your tire. The valve stem should look like a short 1-2 inches (2.5-5.1 cm) tube protruding from your tires. 
It will usually have a black or metal cap on the end of the stem. [substeps] The cap on the stem keeps dirt and dust off your valve.