Went for a ride this afternoon since one of last nice days for the year. Rear tire had a slow blowout. I bought the bike early this summer and PO said it had about 2K on it. I've put 3-4K on bike this summer. I keep a pretty close eye on my tires for abnormal wear. I've kept 42psi in this tire (hadn't checked it in a couple of weeks though), wasn't showing any weird signs. Admittedly I didn't specifically look at the tire as I went out to get on the bike but I would have noticed this anyway, pretty observant on the bike. I'm not an aggressive driver, don't make more left turns than right. But take a look at the tire. I was doing about 35-40 and slowing down to turn onto the on-ramp of an interstate (thank the Lord it didn't happen 60 seconds later), so only went maybe 75 yards or so to get over to the shoulder and get stopped. I can't figure out what might have happened to this tire. Thoughts?