Wheels Manufacturing Aluminum Presta Valve Saver, 11mm, 1 pair

This is a pair of Schrader valve rim adaptors.  They will allow you to use a  Presta valve inner tube on a rim intended for Schrader valve inner tubes.  

• Fills the space between Presta valve and Schrader rim hole
• Price is for two adapters

Founded in 1988 in Boulder, Colorado, Wheels Manufacturing is now one of the world’s largest suppliers of high-quality bicycle derailleur hangers, small parts, repair parts, and specialty tools.