Originally Posted by
merlinextraligh
Like there were never any problems with Square taper cranks. Aluminum crank arms will fail over time where the arm attaches to the steel spindle, with the hole in the crank arm enlarging, particularly if the crank is ridden with the fixing bolt just a bit loose.
Old square taper internal BB's had an advantage with friction, over modern external sealed bearing bb's, but I don't think many people would maintain that square taper is a superior interface for attaching a crank arm to a bb spindle.
+1
Back on track. Agree with Merlin again.
Square taper in my opinion is pretty flawed. But BB30 which I believe you will see evolve toward PF30 with collet BB in the next five years...former is flawed as well. I believe sweet spot still is threaded BB with external bearing crank aka DuraAce or Campy Record UT. Pick one.