Originally Posted by
goldensprocket
...and aluminum axles, titanium saddle rails, carbon fork.
It's a matter of the right material for the job. Many bike parts can be built lighter, far more easily and at lower cost in aluminum. (I don't think I have ever owned an aluminum bike axle. To me, that is a place, like QR skewers, where steel is the right material for the job.) Seat rails - ti has more give in this crucial bike/body interface. I'm light and I ride ti railed seats. CF forks - lighter. (That said, I will never own one and and just stick to good steel forks I trust. I've owned a few with sweet rides.)
Ben