Quote Originally Posted by BleeckerSt_Girl View Post
OR you tightened the big nut that snugs the valve to the rim too tight
I don't even use those. I thought those were only needed if you wanted to put a Presta valve tube on a rim that was drilled for a Schraeder valve? And, what is the point of a valve cap on a Presta valve??

This topic was just discussed. It takes more than 10 PSI over to blow a tube. If it were overinflation that killed your tube, you'd know because it would have popped the tire off the rim. If the tire stays on the rim, the tube CAN'T blow because it can't overexpand!

Others have identified the usual suspects - a defect at the base of the valve caused by (1) abusing the tube in the rim, (2) an old dry rotted tube, or (3) least likely, a manufacturing defect. A pinch flat at the valve would be extremely unlikely, because the reinforcement around the valve prevents the tube from getting caught under the bead.

I inflate my road tires to the max. I've read that someone of my weight (122) really only needs about 80# in a road tire to prevent pinch flats, but I DEFINITELY notice the difference in rolling resistance when they're even 10 PSI under the max.