I built up my Prologue with a bunch of light Dura-Ace parts, first to match them all to the frame, and then most recently, to see how low a weight I could get things. I know the official Park Tool hang-type scale at a non-profit bike shop I volunteer at gives better numbers than my mail scale or mini hang-type scale (both of the latter of which are nearly in unison). Independently measuring the frameset and subsequent components, I was able to build my Prologue to just 41g over 19.0 lb (mixing measurement standards, FTW!). There was a slight compromise in weight vs aesthetics. Technically, I could have employed a 23g lighter saddle (though not quite as preferable to the Scratch Pro), a 16g lighter seat post (that is LeMond branded and black, compared to the cooler looking PRO carbon seat post), and a 19g lighter stem (Cannondale C2, but it is also 10-15mm shorter, thus adversely affecting fit) and been under 19 lb no sweat. So technically, on the 'real' or 'Debbie Downer' scales, I have a sub-19 lb bike on hand. Practically, it's, with this period-correct Paramount bottle cage and hardware, about 90-95g heavier than 19 lb. Whatever, it looks great, and the 6400 brake levers really fit the lithe, sinuous character of the frame. FYI I put these, well, a full 7900 Dura-Ace groupset and these wheels on my super light Trek Emonda ALR (aluminum w/full carbon fork) and arrived at 16.25 lb w/o bottle cages. Super light! The wheelset really worked with the frameset to deliver the best ride possible (racy but quite comfortable). The Prologue feels...a little heavier, but really, it's about how springy or energetic the frame feels that can offset a supposed weight penalty. I mean, I'm still going to like light bikes, and getting the wheels (rotational mass) down in weight helps considerably. That and having tires that like to play (supple, less than 250g, preferably 200-225g).