Couple things, I have had many sets of tires, crappy tires premium tires name brand,Goodyear,Bridgestone,Firestone,and some others. These tires came pre-installed from factory on my car and the tires are already almost 50% worn.I have never once had a problem with a tire. With these tires I have achieved a bubble and 3 screws. I don't know what it is about these tires, but the amount of maintenance that these tires have needed is ridiculous. I understand that the screws and the bubble are an effect of the dumpy roads, but I have driven these same dumpy roads for many years with no problems. Maybe its my bad luck. I think its the tires. I had some Bridgestone Potenza RE760 Sport on my last car that were really great I'm thinking of going back to those. they were a little harsh ride but they griped great wet and dry better than all season tires.