Which are the two common inner tube valve types?

• A. Presta and Schrader
• B. Dunlop and Woods
• C. Tubeless and Run-flat
• D. Slime and Sealant

Answer: (A)

Valves on inner tubes mainly come in two designs that you’ll see most often: Presta and Schrader. Presta valves are tall and slender with a small lock-nut on top, used frequently on road bikes and lighter tubes because they handle higher pressures and save weight. Schrader valves are wider and shorter, resemble car tire valves, and have a removable core, making them easy to inflate with standard pumps. The other terms don’t describe inner-tube valve types: Dunlop (also known as Woods) valves exist in some regions but are much less common; tubeless and run-flat refer to tire systems rather than inner tubes; slime and sealant are products used to seal leaks, not valve designs.