/I tried to post this before but I'm new and probably put in the wrong place. I have a 2009 SI I bought used 1 owner, 100k, and in perfect condtion. Its a Sedan I believe that is FA5. Anyway the last person who owned seemed to want treadlife for his tires over anything else. Because he must have bought these Michelin tires with a 640 treadwear hoping he would get like 80-100k out of them. They still have plenty of tred and them and I'm not saying the car doesn't handle well but, I want better performing tires even if they still are all season but I'd go with a summer tire if I can. I live in GA and we get like 1 or 2 snow or ice storms a year. But somewhere I also read summer tires can't really be driven in cold temps and in the winter morning is can be down in the 20s sometimes and is often in the 30s can summer tires handle the cold temps? If not I could still buy a set off summer tires and just save the current tires and have them put on in the winter. I really just need a softer compound. I'm concerned with handling not road noise or really ride comfort(unless the ride is truely unbareable). I don't know as much about tires as I do engines. The car actually handles great with these awful tires on it but something with more flex and grip would make it awesome. I am I right in assuming that the lower the treadwear number the softer the tire? Will I get more grip from a 400 treadwear than a 640? Or is that not always the case. I know that the traction rating of A or AA or whatever has to do with stopping. So I guess I'm asking what tires should get for the car for superior grip. I will say I don't like Michelin(always had bad luck with them) and I tend to lean toward Toyo, Yokohama, Nitto, and I don't mind cheaper brands like Dunlop or Falken if it is generally a good tire. So i really need to know exactly what that treadwear rating implies and what good set of tires for stock 2009 SI rims would be. Also I was wondering, it has 215/45/17s on it could I put 225/45(or 40)/17s on it or will that cause any issues? My price range would be around 550 for all for not including installation or anything.