A question for the experts here. Is there a way to determine the cause of the flat by looking at the inner tube hole? I am always very carefully checking the inner tire walls and today again I didn't find anything that would have caused the flat. I was just riding down the street, and I thought pinch flats usually occur when you jump curbs or run pot holes (in other words, causing sudden stress on the inner tube).

Is the position (on the tube) or hole shape/size different for pinch flats vs flats caused by debris?

Thanks much.