Hey Bro Your going to have trouble passed the 60mm mark with arch rubbing depending what rims etc you have My car sits at just over 60mm at the moment I would say, I have 16s and it rubs slightly full lock the one way and when cornering hard the tyre catches the outer arch (it was like this on 15s aswell) I now have wider fenders so it shouldnt rub the outer arch now So if you want to go low you would need arch work I would say Im going to drop the back of mine a bit more soon should be about 80+ mm Also when I had 15s my car used to "see saw" on speed bumps, doesnt do it now I got 16s