You might save 20g over the whole bike. I had carbon lever blades when I had twin hopes on my Kot, they're were shite. Seriously weak, flexed loads and weren't as comfy as the old style mini lever blades. I went over the bars once with the on and crack one of the blades, and it wasn't like it landed on it hard! (Hope replaced it for free though when I sent a load of other stuff in on warrenty. ). I'd tell anyone just to stick to aluminium. Carbon fibre stuff is greatfor stem stacks, singlespeed spacers, top caps etc but I wouldn't trust it for stuff that takes a load of force.