I switched the 32mm deep Reynolds carbon hoops on my Spesh Tarmac over to an aluminum box-shaped cross-section HED Ardennes SL with a 23mm wide brake track (versus 21mm) and changed tires from Conti GP4000s to Specialized Roubaix 23/25 ... basically a narrow 25mm tire ... and really like the smoother ride.
I'm 6-1 and 175... I was surprised enough at the difference in ride that I put the Reynolds back on to compare side-by-side again ... and yes. Smoother. And heavier. And I have some very anecdotal evidence that they may be a little slower (one pass down the big hill on my regular ride is the first time in a while I did not crack 50 MPH but it is hard to say at this point. I am sticking with the bigger tires over the summer and will follow up on this.
Anybody else got an opinion or experience on 25's or wider rim tracks?