Originally Posted by timetogo
I've spent many hours on interstates with 80mph speed limits for all vehicles. Traffic moves smoothly and I don't recall any TT's on the side of the road with tire failures. Just lucky I guess.
Damage to the tire structure from high speed is seldom instantaneous, unless we are talking many, many mph above the tire limit (30 to 50 high)
BUT the tire is damaged non-the -less. This damage takes form initially as the loss of strength of the rubber compound around the belt edges. This loss along with the fracturing of the chemical bonds initially shows up as microscopic cracks. These cracks do not repair themselves but become stress concentrators. This leads to ever increasing crack growth and if run long enough to separation of the various tire components.
Ever wonder why some folk seem to have problems after only a couple years of service while others get 4 to 6 years with no problems?
Long term cumulative damage. So bottom line is that just because your tire didn't separate the moment you exceeded 65 that doesn't mean you haven't consumed part of its limited lifespan.