Originally Posted by
RidingMatthew
To OP I disagree with Dannihilator: I have had a liner in my front tire for years. I had 2-3 flats in a row many years ago. I bought the liner years ago. I have looked at my tire and pulled thorns and even a thumb tack out of my tire and have kept riding with NO flats.
I know it seems weird that I don't have it in the rear, but I put the one in the front and must have moved but never found a need for a second one.
You've been lucky then. Seen a rash of "mystery" flats come into the shop, no thorns in the tires, not a pinch flat, and the valve cores were fine. A few of them were because of weak spots in the tube and few were cut where the tube protectors began and ended.