OK chain spill it...what frame are you looking at? I think it unlikely that you can build a 2.7 lb frame into a 9-10 lb bike using SRAM Rival. Using any multi speed group actually will prevent you from building a bike that light. All that being said, don't sweat the weight weenie aspect and build yourself a nice strong bike that you will enjoy riding for years to come. I have two bikes right now one Ti and one Carbon neither of which weigh under 16 lbs. My Parlee will probably weigh just a hair under 16 when it's all built up. My thought provcess is such that I am at least 40 lbs overweight, why should I sweat my bike being just one or two.

I have a carbon post, carbon stem and carbon bars on my Lynskey (Ti Bike). Carbon all around on my BMC (carbon Bike) and will have an Akuminum post, carbon stem and bars on my parlee (carbon bike).

I'm more interested in ride quality than weight and think I have hit on the best combo's for each frame. Of course I won't know for sure until I puit a bunch of miles on the Parlee when I get it.

Cheers!