Dont buy secondhand tyres, i know they are expensive and when you are buying more than one it is tempting, i did against it feeling right 2 as new, i checked them as well, after a week one had a split in the side wall covered in with the black polish they use after a couple of washes it showed up took them back, with all the rubbish apologies you hear and he would get me another, which he did and that was no good, he said he would get another and that had a repair in the side wall he was covering up, these people will sell you anything, i got my money back and would never touch them again. Your life and anyone else in the car is depending on them four bits of rubber. JUST THINK HARD IS IT WORTH IT !!!