Originally Posted by
JonathanGennick
Can one leave the valve open when using those simple adapters? I've never done so, but I recall reading once that it was possible.
I don't, but I suppose the valve could stay open, since that is how it is used to fill the inner tube. My only concern would be that vibration or loosening, tightening of the adapter sleeve could put pressure on the presta "plunger" and cause a slow escape of air.