Originally Posted by
adclark
Check your rim tape and the inside of the rim. Also, make sure that you are not twisting the tubes as you put them in. A twisted tube will often pinch flat itself. Check to ensure the tire is seated on the rim also before you pump it up or you could be pinching the tube between the tire and the rim.
I am trying to make sure. What I do is partially inflate the tube, place it inside the tire, and then mount the tire on the rim starting at the valve. Sometimes I have to deflate the tube when I am putting on the last portion of the tire on the tube, but once it's on, I don't think I can check for twists. I don't think I will have any major twists that would not realign themselves as I am inflating the tube. And yes, the tire sits perfectly on the rim (clinchers are utilized).
My rim tape is fine along with the rim. The failure occurred on the outside of the tube anyway. I'll check everything yet again when my new tubes and tires arrive.