I had a tire blowout on my 1997 F-250. The sidewall had a blowout on a straight level road about 55 mph. No obvious external damage to the tire. The tire was a Nokian Haka 10LT with about 19k miles on it. Image 1 shows the sidewall blowout. Another point of interest these tires have irregularities in the sidewall, as shown in second image. Here are the images… [IMG]http://ekangas.myphotoalbum.com/view_album.php?set_albumName=Nokian_tire [/IMG] Anyone else experience anything like this? The tire dealer said this failure had nothing to do with the sidewall irregularities. He indicated that it was due to a weakened tire. Thoughts?