Yay, I must be tops! I changed from 17 to 18" whels on my Eclipse (granted the tires changed as well) and there was NO QUESTION a change had been made. In fact, just in the ride quality, I had to check my tire pressures again, it felt like they must have been up to 100psi or something (but were correct at about 30/25). Steering was way snappier too, again there was no question - the car didn't pitch a bit and then turn, it just did it right off. Both are probbly related to the stiffer sidewalls on the 18" tires, but either way, it was a huge change. And I remember so, because it felt like something might be wrong with the car at first, until I got used to it. I recently switched back to the 17" wheels and tires for the winter, and right away everything felt kind of squishy compared to before.