So I was pumping up my Specialized Armadillo 700x25 to the recommended pressure of 115-125psi. I accidentally pumped one tire to 130, so I unhooked the hose of my Blackburn Air Tower floor pump. A few minutes later I tried it again but the guage read 40psi. The tire felt pretty solid and I doubt that much air could have leaked in a few minutes.

How am I supposed to use the gauge? Every time I start the gauge reads pretty low. I don't want to burst an inner tube by over-pumping it.


By the way, they're schrader valves. I don't know if that makes a difference.