My husband recently bought a Schwinn Airdriver 1100 at the local K-Mart because my bike has presta valves, and this model appeared to accommodate both Schrader and Presta valves. What a piece of junk! My tires need 110 psi, and this thing pops off of the valve, even in the locked position, at about 60 psi. My husband took it apart trying to figure out how to get it to lock on more securely, and neither one of us can figure out how to reassemble it so that it looks like it looked originally, even though it didn't work then. Grr. This is a truly worthless product, and I already e-mailed Schwinn offering to send it back, but I still need to vent a little more. I won't be able to do any bike rides until I can get a decent pump. Does anybody have any recommedations for something that can accommodate a presta valve?