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.
I've been doing this for years, albeit inadvertently. Wore out a rim, rebuilt the wheel with a new one, and didn't notice the new rim was drilled for Shrader. If I'd noticed, I'd have put on a rubber bushing, or cut a hole in the middle of a 1" square of old inner tube. But it's working fine, so if it ain't broke, why fix it?