Inner Tube Valves: A Comprehensive Guide to Schrader, Presta & Dunlop

There are three main types of inner tube valves: Schrader (also known as American), Presta (also known as French), and Dunlop (also known as Woods or Regina).

* Schrader valve: This is the most common type of valve and is found on most bicycles and cars. It has a metal stem with a hole in the center that allows air to flow in and out. The valve is opened by depressing the center pin with a Schrader valve tool.

* Presta valve: This type of valve is less common than Schrader valves and is typically found on high-performance bicycles. It has a thinner stem than a Schrader valve and a smaller hole, which makes it more difficult to open. Presta valves are opened by turning the knurled nut at the top of the stem.

* Dunlop valve: This type of valve is the least common and is found on some older bicycles and children's bikes. It has a similar stem to a Schrader valve, but the hole is located on the side of the stem instead of the center. Dunlop valves are opened by depressing the center pin with a Dunlop valve tool.

In addition to these three main types of valves, there are also a number of other less common types of valves, such as the Woods valve, the Regina valve, and the Sclaverand valve. These valves are typically found on older or more specialized bicycles.