We tested all kinds or pressure with the same results. This issue was also common among some runners in the mid west. At first our thought was that some curb had a sharp edge because that’s the kind of tear it tends to look like but after more than one track it was obvious and the fact that MG replaced more than one set for free proved a factory issue. For us we will not risk tire failure, an instant flat at speed can put you on your head and we do not need that possibility. My brother and cousin both went off at over 100 in high load corners, no more MG for us.