Originally Posted by timdoginc
no it's not normal, it didn't happen until i changed my tire the first time. and i'm not replacing them because of this, i'm replacing them because they've popped. not because of this, but they've popped.
and it doesn't happen to both tires, just the back one.
Really not difficult to find the problem. When flat take the tube out taking note on which direction the tube was in and keep the tire in its position without letting it turn. Find the leak in the tube, even if you have to submerge it under water. Once you find the small hole set it up next to the tire and rim inflated to find what area the rim or tire caused the small hole. If the hole is on the outside, it will be a tire issue. If the hole is on the inside it will be a rim issue. Pretty obvious. If it is a tire issue, it is possible to have a small object in the tire like a little piece of glass or something that when under certain pressure finds its way to the tube and puts a small hole in it. If it is a rim issue, it could be tape or something very small stuck in the tape.
Pretty elementary really.