The Presta valve has an internal body, a valve cap, and an outer stem. In addition it has a lock nut which takes advantage of to safe the stem on the wheel rim. The air pumping process of this valve is a bit difficult because of the compact valve diameter. https://free-bookmarking.com/story19802399/how-much-you-need-to-expect-you-ll-pay-for-a-good-presta-addons