So I haven't had a flat in a long while. In fact, the tube I'm using right now was installed (by me) when I purchased new tires about 6 months ago. I've probably put 1300+ miles on it since I installed both, riding every week. Anyway, I was riding yesterday and I noticed a slight repetitive bump in my rear tire. I pulled over, thinking I had something stuck to my tire. Nothing on it, but I did notice a slight deviation at one point in the rotation. I made a mental note to check it out when I got back from my ride. Anyway, about 5 miles later, I started to feel a much more noticeable bump, and then suddenly heard the rear brake rubbing. I quickly pulled over, bent down to inspect, and saw over the course of about 5 seconds: the tube grew out between the rim and tire, bulged, and then blew out like a shotgun! My ear was ringing for about 15 minutes.
So, I'm a little confused. I've never seen any flat like this before. If I had just installed the tube, I might be thinking it was an improper install ... but after 6 months? I checked the tire and it appears intact and the tire beads don't appear torn. In fact, that tire model has always been a real pain to get on/off, so it must have required a huge amount of force get between it and the rim. My memory says I inflated the tire to about 122psi ... the tire is recommended for 110psi, and 125psi max. I usually inflate to ~120psi. It was hot, about 92-95 degrees. Did I possibly over-inflate?
Any insight would be appreciated.