Originally Posted by slothlike

As I get older, I recognize these diminishing returns. My Rival bike is as light as my Dura Ace and I prefer the ergonomics of Sram. I also own 6700 and yes it does shift better than 7900 because as you know, they rushed 7900 to market and refined 6700 before release. From you example above of grams savings, you can easily spend 1/3 less money on new bars, seatpost, skewers, saddle and even wheels to save the weight difference. All my bikes are in 16.5 lb range without fancy wheels.