I'm just curious and I've done a bit of searching and turned up nothing that is very descriptive. Some tyres (not all) seem to have an grip rating advertised with them. I haven't actually checked mine but a mates Achilles (Tread wear 400) tyres have an A++ Grip rating and recently while researching tyres (tread wear 240) I was looking at some that advertised a AA grip rating. So the question: What the hell is the grip rating? How do they determine the grip rating of a particular tyre? And what does it actually mean to us who purchase the tyres? Cheers,