Originally Posted by
hamster
As for BB types, I don't know what crankset you have in your bike, but quite a few bikes with BB** bottom brackets ship with FSA SL-K Light BB30 crankset, which is something like 200 g lighter than the standard Shimano Ultegra crankset+bottom bracket combo. It's hard to beat that.
I have a Shimano Ultegra 6800 crankset and I'm perfectly satisfied with it. I'd rather spend the extra money on the frame than to buy a new crankset. Is there any easy to understand compatibility chart for bottom brackets? I'm totally lost.