So far so good with my first test of these tubes. I've only ridden them a few hundred miles, but I can safely say that a smooth valve stem is a must. That's why I tried them on Super Bontrager headlights after 3 failures in a row, all of which failed in the valve stem area. I recommend based on past performance. They are not flat and hold air well (I run 110-120psi pressure).
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