The butyl rubber compound that the Q-Tubes 650c x 18-23mm Presta Valve Tube is composed of is lightweight and offers protection from the elements. The threaded presta valve features a removable valve core making it easy to add sealant for even more protection while riding. The 650c tubes are available with a 32mm, 48mm, 60mm or 80mm valve length that will work with pretty much any wheel available. The tube weighs roughly 90 grams.
Q-Tubes 650c x 18-23mm Presta Valve Tube