said by MooJohn:It wasn't the tire pressure of 26 that caused the defects in the tires to show themselves. Those tires would have had tread separation at any pressure. You can read about it in my prior post.
If they are truly overinflated, yes. Just being higher than the auto manufacturer's recommendation does not necessarily qualify them as such. Ford Explorers in the Firestone tire fiasco specified 26 psi on tires that were rated for 35 (I'm guessing a 15-inch wheel). We see how well that worked out for