I'm currently riding/training on Mavic Cosmic Carbones, I don't enter races or do time trials now and have started to look for hills rather than shudder when I find them. I live in the Valleys of South Wales so I've got plenty to find. Although the Cosmic Carbones are pretty to look at I feel i'm not using them for what they were designed for. I'm thinking of selling them and buying Ksyrium SSC SLs. They are 460g lighter which is equivalent to a tin of beans so without doubt It will be a lighter ride and i'll get up hills quicker or am I just being a Weight Weenie?