I'm new in the area I'm in now. I got a bike that has presta valves, but the cheapest on Amazon are the Schrader tubes. I have a slight preference for them anyway, so I want to drill out the rims a bit to allow this. I'm in a slightly rural area and Amazon beats the only bike shop around.
I'm hoping that it's a standard bit size like about 5/16 inch. I realize I will need to be careful to smooth the edges of the hole after drilling. Are there any problems with doing this?