Dunlop Valves are a type of bicycle valve that was first introduced by John Boyd Dunlop in 1892. They are also known as Woods Valves or English Valves. The valve consists of a rubber stem with a threaded valve body that can be screwed onto the rim of a bicycle wheel. The valve is opened by unscrewing the top cap and closed by screwing it back down.
Dunlop valves are commonly found on European bicycles and are similar in design to a Schrader valve (the same type of valve used on car tires), but with a narrower stem diameter. They are also smaller and lighter than Schrader valves.
One advantage of a Dunlop valve is that they are less prone to leaking or breaking compared to other valve types. They are also easier to pump up due to their larger diameter and can be inflated using both Presta and Schrader pump heads with an adapter.
However, one downside is that they are not as commonly found in the United States, making it more difficult to find replacement tubes or tires.
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