What are the different inner tube valves?

There are three primary types of inner tube valves: Schrader, Presta, and Dunlop. Schrader valves are commonly found on car tires and have a wider diameter with a spring-loaded mechanism. Presta valves are narrower, typically used on high-performance bicycles, and require a threaded nut to secure them. Dunlop valves, less common, are similar to Presta but have a larger diameter and are often found on some European bicycles.