Originally Posted by Nessism

With all due respect, I disagree with your estimation that the spindle does not flex. Back in my weight weenie days of mountain biking I replaced the steel square taper BB with a Ti one - 122.5 mm long. The new spindle was significantly lighter but a whole lot more flexible as evidenced by the increase in chain rub the bike experienced. I've experienced the same reduction in chain rub when upgrading a square taper Dura-Ace crank with an Octalink one (not as dramatic a difference as the mountain bike though). FYI, I weigh about 170 lbs and like to sprint over rolling hills instead of downshifting out of the big ring - this is a common situation when chain rub will occur.

Believe it or not, but the spindle does flex. I'm not saying this is a problem per say, just an annoyance for people like me that don't like hearing the noise.