Well, its one of those things that you learn to deal with, but for some reason my tube gets hole on the underside, where it faces the rim, and it happened for the third time in a month... Each time I checked the rim and the tape that covers the spokes - it looks totally fine. Also, I find holes on the underside, but different location each time (relative to the nipple). What could this be? I am using the correctly sized tubes, the tube is 700 35/43, and my tires are 700x38. Maybe I should use different brand tubes?