Strabo wrote:
I use the high pressure rubber stems myself.
If those work for you, fine. They're rated 80 PSI if I recall, might be 100, just not sure.
Our coach had those when we bought it. Good Bridgestone tires, crappy (and I'll defend that word in a minute) "high pressure rubber" valves.
I found that if I as much as pressed a tire gauge onto the valve crooked, it would hiss, losing air at the hole in the rim. That alone was enough to point me to metal valves.
Later, I learned that while Extenders, Adapters, etc. were trouble enough on Metal Valves, adding them to Rubber Valves was a Recipe for Disaster. The Valve itself, by itself, may be OK. But NEVER with any additional weight more than a cap added! So, I say, Crappy!