Originally Posted by DannoXYZ
Yeah, the presta uses an active force to shut the valve, whereas the shraeder only uses the spring-pressure. I've had a couple instances at Bonneville where the rotational inertia of the valve spinning around actually forces the schraeder innards open against the spring. Not fun losing tire-pressure at 185mph... The solution was to lock-tite on some steel valve-stem caps.
I have that problem on my bicycle once in a while too. That's a helpful tip, thanks.
