My First Blowout

[trailbiker]

We just got back from weekend on Cape Cod. On the way out the curbside tire blew out. It happened on I495 about 5 miles from the Bourne Bridge. I am really glad it did not happen on the bridge. The tire was a Kumho 857 205R14C.
Load range D. Our trailer was not heavily loaded and tire pressure was 60 psi when we left. We traveling at about 65mph. The tires were purchased June of 2012, we only have about 12,000 miles on them. I did not get any warning before the blowout and have no idea what caused it.

We are have Good Sam Roadside assistance. After waiting for them for about an hour for Good Sam to get back to us we called them and were told they were still unable to find anyone to give us assistance. Fortunately i had a jack ,breaker bar and spare. Changing a tire on busy interstate is not something i enjoyed. I am going to add some Safety triangles to place on the highway in case i ever have another breakdown.

The date code showed the tires to less than 6months old when it got them. They were purchased June 2012. I wanted to buy Maxxis 15 tires, but there was no local dealer, I went contacted Maxis and was told the could not guarantee the tires they shipped would be less than a year old.

I would like to advise on wether to just replace the tire or go with new 15" tires.
Does anyone use a 14" tire for a spare after switching to 15" tires?