I just had flat tube #4. Enough is enough.
Please examine the photo of my rim and the valve stem hole. Is the rim tape too far off of the edge? I had inflated the tire with more air, per the first post's advice responses. It had been working fine for nearly a week now.
Suddenly, pssssss and it's a hole at the valve stem. AGAIN. Just like the last two times. So am I just not pumping it up enough -- but if so why did it last so long -- or is it the rim hole rubbing away at the valve entry area and eventually cutting into the rubber at the valve?
I don't mind pumping it up...I have to do it manually, and fear for overinflation and potential explosion...but I can certainly pump it to the proper volume, as I have been riding on this tube for several days now.