Not looking for a specific final weight, but would like it to be under 20lbs. This is meant to be more of a learning experience in building up my first bike from scratch. So far, I've got SRAM Rival shifters/derailuers, Aksium wheels with 105 cassette (12-25), 105 compact crank, and an Ultegra chain. Keeping my eyes out for some Rival brakes

My main bike uses a standard double and my commuter/rain bike uses a compact triple, so for this build, I'm going to go with a compact double and use it for climbing really hilly roads with sections around 16-20%. I ride with a very fast group and even though I can climb pretty well, I sometimes find myself fading back trying to keep their high pace on the hills and feel like a bike with a compact might help me spin more and not blow up on those steep pitches. That's also why I was looking for aluminum; the stiffness will help more when climbing.