Originally Posted by WhyFi

That's just my guess - I don't have an appropriate scale and I'm not curious enough to buy one to find out. If if were rim braked, I would assume that it would in that 16lb range, so I pad that figure a bit to account for the hydro system. I will say that it does feel pretty damn light to me when I heft it without the GPS, tail light/radar, headlight/video camera, and water bottles, though.