I bought a new rear wheel for my singlespeed trek 400, 622x16, which should fit 700x25 tires just fine. I'm running the original front wheel on it, which hasn't been a problem at all. When installing tires on the new rear wheel, I've noticed it is very easy, a little too easy, almost effortless. I can take the tire on/off with no levers. When fully inflated, it cinches up well and all seems copacetic. I've replaced the tube twice now, and it has happened the same way both times... I replace/patch the tube, ride on it for most of the day, come down the next morning or a couple hours later and its flat! The holes seem to be in roughly the same place on the inside of the tube, but I can't find anything on the inside of the new rim that could be puncturing it. Now basically what I am asking is if you think this is an issue of my rear rim being too small/rear tire being too big.
Please help! Its driving me NUCKIN FUTS!