The Micro Co2 inflator is light and perfect for when those flat get you down. However, if you're buying this you really ought to head over to our inserts or airless tires and give them a look. Those really work. If you're still insistent on having a backup plan then we applaud you. The scouting system really worked on you. Be prepared, and stay prepared. Works on Presta and Schrader valves.