Originally Posted by
maddog34
tube was pinched between the rim bead area and the tire bead... you inflated the tube and it got tighter... it then blew out.
next time. inflate the tube ever so slightly so that it takes on a rounded appearance, but is still fairly soft... it only takes a few pump strokes... then insert the tube into the tire....once the tire beads are inside the rims' lips, add a few more pump strokes.. then Grab the tire with Both Hands and Twist it Side-To-Side in 6 to ten places around the circumference of the Tire... this gives that pesky tube an opportunity to behave as it should!.. continue pumping until desired pressure is achieve, and check that the tire has fully seated into the rim lips.
i do this EVERY Time i mount a Bicycle tire up... and i dismount/mount up a Lot of tires here.... two just rolled out the door 15 minutes ago...
I don't always twist tires side to side when installing them, I will do that from now on, thanks. My method has been the same as you described, but only twisting if I see the witness line is not lined up with the rim after a bit of inflating. I have installed a lot of tires, it's strange this happened twice after having never encountered it before.