How do I know? I accompanied a friend to your so called backyard/garage (which is actually a shop), and you tried to sell us rotten and unroadworthy tyres, which you claim to be good. (Not everyone is ignorant about tyres ok) I don't know where you get your scrap and unroadworthy tyres from, and I don't like the way you try to flog your crap to the skyline community. Anyone who wants to buy anything from this guy, I advise you to careful.