I had something weird happen today or at least weird to me. I've been off the bike for a couple weeks (I got married and went on my honeymoon) and thought I would go out for an easy ride to get back in the swing of things. I get out to the garage and find my rear tire is flat....as a pancake. I checked the tire for any obvious causes like a nail or cut in the tire. The tire looked good so I got my hand pump out and started pumping up the tire. Immediately I hear a loud hissing noise so I stop pumping and pull the tube from wheel. I quickly find the hole in the tube. It's on the rim side of the tube exactly in the center of the tube. The rim liner is intact and I could find nothing obvious that would cause a puncture. My spokes all appear to be tight. The tire was fine after my last ride. This is not a slow leak so if it occurred while I was riding I definitely would have known. Could expansion and contraction due to high temperatures be the culprit? Outside temps have pretty much been 95 plus degrees for last several weeks and the garage is not air conditioned. This tube has less than 100 miles on it. All on paved roads or paved MUPs. I think I'm going to take the wheel and tire down to my LBS and let them see puncture and have them install the new tube for me just to be safe.