Regarding the question on losing the BB30 stiffness, not really. When you use an adapter, you lose a little bit of the rigidity of the BB30 cranks. A magazine did a study comparing two cranks, BB30 and not, same crank otherwise. They found the biggest difference was in the weight of the cranks - the BB30 version was lighter.

Having said that, I'm now convinced that trivial weight (say, 1-2 lbs, even 2-3 lbs) on the bike, except in the wheels, doesn't make much of a difference *if* the rider is carrying weight. I raced a much lighter bike in 2009 than in 2010, but in 2010 I'm much lighter myself. The net loss in weight is about 30 lbs, and my bike is anywhere from 2-4 lbs heavier. My race wheels weigh about the same for both years but my training wheels weigh a lot more for 2010.

So am I gram hunting on the bike? No, not really.

Having said all that, I like the BB30 philosophy. My back up bike will have BB30.

I use the Cannondale SI cranks because they allow me to switch crank length without losing my (SRM) spider. Takes about 5-10 minutes to change the arms.

(btw Cannondale created the BB30 standard, not that it means anything other than they created it.)

cdr