I don't know if it's the pump or the presta valve adapter. But every time I pump air into the tube, I have trouble pulling the plug from the valve. It doesn't seem like a lot of air escapes. But when I plug the pump into the valve once more, the gauge would read 60 psi (I pump it up to 80-90 psi). Why?


Also, My hand pump sucks. I can barely get 40 psi on that thing. any recommendations?