i was just wondering, as i looked on the mercedes boards, an slk owner was asking others what they thought about 19's and 20's. and a lot said:

A) the ride would be like crap.
B) the car would be slower due to the extra mass of the tires.

so i think about it and i remember that the srt-4 actually downsized the stock tires for a lil extra acceleration. so would the crossfire be faster with say 17's and 18's? I was just wondering as i'm not real familiar with the specific topic of tires.