Rode 24 miles on the weekly club ride. Luckily I looked at my rear tire just before we started and noticed that the outer casing was worn through and the inner casing was showing. Scary ... and I know better than to not check them before every ride. I live near the start point and went home for a quick swap for the Salsa. I could feel the extra 6 lbs and the fat 37mm tires, but had a good ride.
http://connect.garmin.com/activity/116153858