It's delamination aka the damn thing came apart. It should not have happened. I bet it may be a very old tire, run low on air at sometime, near flat. Happen on a '2006 FJR I brought in '2012 w/ only 1700 miles on the bike. It had stones (I think) & the front tire came apart from old age. On went the AVONs w/ beads. Bike was wicked fast. If my memory is correct, it was 1300cc w/ 144hp, right at 600#