Originally Posted by
oldbobcat
The clue is in the quoted text. The valve section of the tube is getting pinched between the rim and the tire beads.
After seating the second tire bead in the rim, you need to push the valve stem into the tire before inflating. This will get rid of the bulge and seat the valve section of the tube inside the tire.
Think about it. If that was the case the holes would be on the two sides where the rim is. Thats not whats in the photo. The problem is much more likely to be being caused by the valve stem getting hung up and then being driven over continuously because its too close to the outside of the tire - which will eventually cut through the tube.