Quad Wheels Presta Stem Saver for Schraeder Rims, Black, (47817)Product DescriptionPresta valve saver for use in schraeder valve rim. Adapts presta valve tube to fit in schraeder-drilled rim. Helps prevent valve breakage.From the ManufacturerQuad Bicycle Brake Shoes V-Brake W/Hardware BlackFeatures of Quad Wheels Presta Stem Saver for Schraeder Rim..