Originally Posted by Tireman9
IMO you suffered a "Run Low Flex Failure" based on the evidence I see in the picture of the condition and marks on the sidewall. This type of failure can happen in 4 to 10 miles at highway speed when the tire is actively leaking and has lost a majority of its proper inflation.
I have a number of autopsies with pictures showing this on my blog.
I certainly did drive on it for a while before I discovered it.
Here's the exact scenario:
-Morning before leaving I checked all tire pressures. They seemed fine.
-We stopped for lunch in Gunnison CO. At that time I walked around the truck and trailer and eyeballed the tires. Nothing stood out.
-We then drove over Monarch Pass. This is a nasty, steep, windy mountain road. Lots of elevation gain and then loss, windy, and steep. No guardrail, no breakdown lane, and a cliff if you go off the road. I drove conservatively.
-My 2015 F-150 has a tow/haul mode. It does a nice job of downshifting to help out when going downhill. I spent much of the downhill portion in second gear, so I didn't need to ride the truck and trailer brakes hard.
-We then stopped at a gas station in Buena Vista CO where we discovered the tire had been shredded.
I don't recall any impacts or hazards that might have damaged the tire.
I really don't know exactly where it went flat. Nor do I know whether it was sudden or gradual.