Presta valves are skinny (6mm in diameter) needle-like inner tube valves you’ll find on virtually all road bikes and dearer mountain bikes. The Schrader is the traditional valve you discover on car tires and a lot of bicycle interior tubes. Some pumps, like this Silca Gravelero, attribute reversible chuck heads. https://mypresspage.com/story4804182/detailed-notes-on-addons-prestashop