Originally Posted by
andrewclaus
Or don't worry about it. My wife's bike has had Presta tubes in Schrader rims for decades without an issue, with high pressure road tires.
This, unless one is really bad at attaching and removing the pump valve chuck on and off the valve. Then the added support of the valve stem might reduce a valve base issue which would be caused by the wagging or twisting that some do when dealing with a pump chuck. But once aired up the PV in a SV hole needs no added support during riding. Andy