Heel and toe wear!! Thank you very much! Now I know what I have. My ‘07 Ram only has about 13k on it,but it has low-profile 20″ Goodyears,and the outer edge of both front tires have a saw-tooth look from the side.

Jack, I don’t doubt your professionalism but you’re wrong.
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Underinflated tires do heat up but that heat can’t repressurize the tires because it dosen’t expand enough. Also, if it could the tire would be repressurized and the source of overheating would be diminished, meaning the temperature of the tire would level out. The problem is that the air may compress a little but at low pressures air leakage could start at the beads (where the tires meet rim edges), as well as the breach that caused the loss of pressure wherever that may be (bad valve stem, poor stem seat or cut in stem, nail or slash to the tire, etc.)
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I tried to be general about this but I guess I was too general.
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I, too know a bit about tires. They’re the most important part of the car and I’ve owned 26 of them.

Jack is a complete moron. An underinflated tire doesn’t gain enough pressure to cause a blowout, it blows out due to the friction and wear of the sidewalls from being low. As a tire proffesional you must not be very successful, but a great comedian because you had to be joking with info as stupid and wrong as that.

oh and its weird how this bulletin is brought to you by BFG but the tire on the picture is a Yokohama YK420

jack your comment makes no sence, i too am a tire professional, i work for discount tires. an underinflated tire does blow out yes, it weakens the side wall and eventually brakes it down to a fine powder, now an underinflated tire cannot gain more than 2-4 pounds of pressure. there is no way an underinflated tire can reach its mamimum pressure, its impossible. unless you drive with a compressor hooked up to it as your going down the road.

gtwildfire, added some relevant points but might be a bit off on his explanation.

Low pressure does cause extra flexing which leads to higher temperature. This higher temperature does two things: 1) it weakens the rubber compounds and 2) it increases the air pressure. So, an underinflated tire blows out because after the pressure increases the weakened rubber can’t resist the higher pressure.

In my opinion as a tire professional, I consider underpressure to be considerably more dangerous that overpressure unless the extra pressure is beyond the tire’s recommended maximum.

I’ve written more about this in an article on Inflation Pressure (www.tire-information-world.com/inflation-pressure.html), if you’re interested.

there’s also middle tire wear due to overinflation, outer edge wear (both sides) due to underinflation.
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Both conditions can be very dangerous. Overinflating means that when the tires warm up from use on the road, the air pressure gets even greater, further increasing the chance of structural failure. Underinflation causes more friction, the sidewalls to compress under the weight of the car more than normal and the steel reinforcement in the tires to stress, creating heat and if the pressure is low enough the tire can blow out also.

Does dimples on the tires from burning out/peeling off count as tire wear? mine has a grip due to that!