Stay away from cheap tyres, looks like they have disintegrated on you, i had same problem with cheap tyres on my focus st, tyres had only done a couple of thousand mile, only on the car for 6months, looked perfect until very close inspection of the sidewalls, they were literally falling apart, cracks around the sidewalls, very lucky i spotted it before they blew out. After doing some research i found out they were apparantly 'single ply' sidewalls, and apparntly thats not good, anyway, lesson learned, dont buy cheap tyres.