Presta valves are skinny (6mm in diameter) needle-like internal tube valves you’ll locate on basically all road bikes and more expensive mountain bikes. The Schrader is the standard valve you discover on auto tires and plenty of bicycle internal tubes. Some pumps, which include this Silca Gravelero, aspect reversible chuck https://bookmarkeasier.com/story19591124/how-much-you-need-to-expect-you-ll-pay-for-a-good-presta-addons