Continental Supersonic Presta Tubes Continental's lightweight Supersonic Presta Tubes are an easy way to drop weight on your bike. Dropping rotating weight also has the advantage of improving acceleration. The Continental Supersonic Presta tube is offered in different valve length options and according to our Jenson USA scale weighs in at 55 grams. That 55 grams is for the 60mm valve and includes the nut and valve cover. Features36, 42 and 60mm valve Butyl Presta Valve Removable Core55g (60mm valve, nut and valve cover) | Continental | 700C Supersonic Presta Tube 700C X 18-25, 60Mm Valve