Originally Posted by
neil0502
Also, if you haven't done this already, take a small round file and "clean up" the edge of the hole through which the valve stem protrudes. I think the other posters have the right idea about your /actual/ issue, but ... it's not a bad habit.
The other thing CAN be a bad batch of tubes that get tiny tears AROUND the valve from "bad" or "aggressive" pumping technique.
It starts with finding the leak on the tube, though.
I am as careful as can be and ripped 5 or 6 tubes this year. In fact I started oiling the valve and it still happened. I have finally put a nut on the inside and outside of my wheel to hold the valve in place rock solid. That has worked pretty well.
Yesterday i ordered the schwalbe Marathon Plus HS 348 so I am looking forward to 15,000 flat free miles!!!!