I will be buying a dedicated set of rims for summer tires and keeping the stock Rado rims for winter/ice tires. Considering summer tires, I am looking at a rim--the Motegi Racing MR125--that is 7.5 x 17 and weighs about 6 lbs less per rim than the stock Rado rim. I wanted to go for something a bit wider for tires (215/40/17) and some tire options are the Yokohama ADVAN Neova AD08R or the Dunlop Direzza ZII, both of which are rated by Tire Rack as "Extreme Performance Summer Tires." This would seem like a no-brainer as both tires are well-rated and would have higher dry grip than the stock Bridgestone Potenza RE050A while having at least decent wet weather handling. However, then I read an article in a recent (April 2014?) issue of Road & Track comparing the Yokohama ADO8R (Extreme Performance) to the Michelin Pilot Super Sport ("just" a Max Performance Summer tire). The article concluded that the less aggressive Michelin retained the inherent handling of the E46 M3 test car whereas the Yokohama's enhanced grip hightened the M3's tendency to understeer, making the driving experience less enjoyable. (I tried posting the link to the R&T article but this website responded that my like to post ration was too low which I must say is the first time I have seen this requirement on an enthusiast website. But oh well.) Any thoughts on mounting a less aggressive tire to retain the Fiesta's inherent handling characteristics and overall fun factor as opposed to a supoer grippy tire that may undermine the balance and overall tossability of the car? One thought is that from all of the reviews, while the Fiesta does have slight understeer characteristics dialed in from the factory, the car is inherently "neutral" in terms of handling and turn-in characteristics. Thus, increasing the grip at all four wheels would not seem to alter the character of the car whic was neutral to begin with. Then again, what do I know? Your feedback is much appreciated. Thanks.