The damage was done when the tire was under inflated and the flex of the sidewall and tread was occurring. Tires heated after over inflation are less likely to feel warm to the touch. They will let go with less warning. Here is a common procedure for finding the correct street pressure for your tires: Find and empty parking lot. Inflate your tires to the max pressure listed on the sidewall. Mark the tires across the tread with a piece of chalk or crayon whatever really. Drive straight forward several feet, be sure not to turn at all. Look at the mark across the tread and see which part of mark has worn off. If the mark has worn off at the center but not at the edges you have too much pressure (duh i already told you max pressure would be too much). Drop the pressure and repeat steps 2-5 until the desired pattern is achieved. Be careful too low of a pressure will rub the mark so always start with too much and work your way down. It your case with the outside tread gone, you have no real way to adjust the tire pressure to have the load evenly applied across the tread. The treadwear shown indicates that a damaging period of under inflation has occurred. The tires are compromised and suspect. Be careful. Eyes wide open.