I don't know why we can feel a 5% difference in weight on the bike, but we can. So I think investing in lightening it can be worth it, even if your body isn't at its ideal weight. Of course, I don't invest much in it, because I'm a cheapskate. 23 pounds? I'm pretty sure I have nothing near that weight except for maybe my fixie. My two lightest road bikes, McLean and Surly Cross Check, are probably well over 23 pounds. 23 pounds sounds super light compared with what I'm used to. And it's not that I ride large bikes, either. My bikes range from 54 to 58 cm seat tubes.