In just two years, each of the four tires gave out. One of them had a hernia, and the other three, one at a time, the cord emerged from the corner of the tire that was located between the sidewall and the functioning area. The rubber has been torn from the interior of the wheel, where it is not visible to the naked eye, for some unknown cause. It is discovered after the wheel has been removed and the organism has begun to poison. Because it is possible to drive on potentially hazardous wheels without being aware of the problem, I became aware of the fact that I was driving on two dead wheels when I switched from summer to winter tires. The protector can still be ridden and used, but it will eventually need to be discarded. There are no issues for the Japanese to deal with when they roll out to the slick. I had an unusually smooth ride on asphalt, which was perfect for my commute to and from work. Never again will I purchase tires from Cordiant. Even with brand new rubber, you can detect a seam and an unevenness in the spot where the internal components of the tire are joined together. This is the case even when the tire is brand new.