Originally Posted by
Rick Imby
I agree with your ---(like with a dead straight and free to move stem)--- line. It is just so very rare when a tube is truly defective. How come when installed by the bike shop tubes don't have the "defective" issue? I am certain that once in a blue moon you will find a defective tube but as I stated earlier---both Kenda and Duro pretest all tubes under pressure.
I also don't buy the idea that shop installed tubes don't have problems. I am far from the first to complain of tires coming unseated, bumps and dips, and flats by the time I got home. How would you know if the tube was defective or not? Pretesting outside of a tire is no guarantee. All those I suspected of defects were pretested.