When I built up my Pinarello frame several months ago, I just hated the ride with the old D/A wheels and 23mm tires. I was almost to the point of stripping the bike and selling the frame. As a last try, I put on a set of 25mm tires that I had laying around that were going to be installed on the Madone, (but never got around to it because I went with different wheels on that bike). Boy, what a difference! I'm really liking the ride on the Pinarello now and am thinking about dumping the Madone or the Kestrel because I don't use them much anymore. Haven't noticed any difference in average speeds either.