Let us know what you find out when you get the front tire off. If there was no tire damage, you really didn't have a "blow - out" . Rather a sudden and rapid flat. I'd also suspect a tear around the valve stem. As a tip, I never install the top nut on the valve stem. If you run lower air pressure without rim locks, the tire will creep around on the rim. This is particularly true in the rear but it can happen in the front also. As the tire creeps around the rim, you will be able to see it because the valve stem angle will change. It starts out at 90 deg to the rim (if it's installed correctly). If the tire creeps the angle will become more acute. This tells you that (a) the tire is moving and (b) it's time to break the bead and shift everything back into place. IF The valve stem nut is NOT installed. If the nut IS tightened down, you will not realize the tire is creeping and the tube will eventually tear away from the stem. This causes a very rapid deflation. Also, I normally install a fresh tube with each tire change. Many guys are using 20 year old tubes on their bikes......they're asking for trouble. If you ride in the wet alot, a bit of silicone seal around the gap between the valve stem and the rim will keep most of the water out.