Presta valves are skinny (6mm in diameter) needle-like inner tube valves you’ll uncover on essentially all road bikes and more expensive mountain bikes. The Schrader is the normal valve you find on motor vehicle tires and many bicycle internal tubes. Some pumps, including this Silca Gravelero, aspect reversible chuck heads. https://bookmarkingdelta.com/story19696487/the-fact-about-prestashop-live-chat-support-that-no-one-is-suggesting