In preperation for a ride up the Blue Ridge Parkway I checked the tires. Front tread OK pressure OK. Rear - tread OK (not great, but OK) pressure a little high. 48lbs.
End result - the guy behind me was looking for the man with an elephant gun. Blowout at 50 mph. Cord showing in three places and 2\32 tread inbetween. Bike was loaded but didn't feel any out of balance bounce.
Tire had 4500 miles on it. DO NOT overinflate Avons.