first change I made was putting on Schwalbe Rocket Rons, Specialized turbo tubes (light weight)<-- noticed biggest weight change with tubes and tires. Then: Race Face Dues seatpost, Selle Italia SLR ti seat, Ritchey Carbon bars, Ritchey WCS foam grips, KCNC stem. Some stuff I had in my garage. Not sure what was going on with my stock tubes but they were extremely heavy.