I have a 2007 Jamis Aurora with Alex ACE19 rims. I inflate my tires once a week to 110lbs (yes it is printed on the tire sidewall), but every few months the valve stem goes pop while I'm pumping or removing the pump from the stem. I have padded the stem hole in the rim with some duct tape with no success. It went pop again this morning and I had to walk to work. Does anyone have a solution to this problem?