Bicycle tire valves allow riders to inflate their tires with air. According to bicycle expert Sheldon Brown, the three types of bicycle tire valves are Schrader, Presta and Woods. Cycling writer Jobst Brandt says most current bicycle manufacturers produce Schrader and Presta valve tubes. Most bicycle valves attach permanently to inner tubes, but some newer tubeless bicycle tires use a special Presta valve temporarily attached to the bicycle wheel rim.
Cyclists call Schrader valves "American valves." Automotive tire and plumbing applications in the U.S. commonly use Schrader valves. Sheldon Brown's Bicycle Glossary recommends the use of a 21/64-inch drill bit to convert Presta-drilled rims to accept Schrader valves. In the U.S., you can fill Schrader valve tubes at gas stations and with many styles of air pumps. Most children’s bicycles and other less expensive bicycles use Schrader valve tubes.