dtown

Ordered my convertible GT with the standard 17-inch bullitts but saw one in the same color last weekend with the 18-inch polished aluminum bullitts. Nice - real nice. Dealer says they can probably switch me out. However, one of the things I like about the GT convertible (I test drove one with standard 17-inch bullitts) was Ford's ride tuning - equally comfortable for cruising or firmed up for the twisties. Anyone know how much I'll lose in the way of ride/noise by switching to the 18 inchers? Not/barely/very noticeable? I'm in D.C. and roads around here definitely ain't so great. Thanks in advance.