I seem to get flats from the base of the valve stem, basically, where the valve stem meets the tube, and I'm wondering if that's just basic wear or what.
Also, should I be tightening the ring nut on the valve stem onto the rim pretty hard, or leave a little play?
These are 700 X 23 and I usually go pretty high-pressure, around 120.
I live in Florida, so wondering if the heat is an issue. Bike is garage kept, no A/C, so it might just be time, wear, etc.
Hope you can help with suggestions.
Thanks!

S