Originally Posted by
PlatyPius
The forces acting upon the tube are completely different. One is force (from the air pressure) pushing against the tube and valve from the inside, where the force is spread over a much larger area whereas the other is a pulling force concentrated on a small area (the valve stem).
Tell me something, please.
If the problem here is caused by tearing the valvestem off with the pump, then why are you dickering over what stem length to use? What sort of stem length is immune from tearing off the valvestem with careless use of a pump? Wouldn't it make more sense to get the OP to bolster the other side of his frame pump with his other hand when he pumps? Should people
without Vitesse rims and short valves stop pumping up carefully?