Originally Posted by
bikerjp
Some of the new higher end cannondales are coming with PF30 BBs. Maybe a sign of things to come. If one had a BB30 is it possible to use PF30 bearings? As I understand it, a BB30 crank and PF30 crank are the same and only the bearings different. Or is the PF30 shell also different? I know about the FSA universal crank/bearings but was just wondering about "upgrading" a BB30 to PF30.
Bearings are the same for both BB30 and PF30. The '30' reference shared by both is the bearing I.D.
In the case of carbon fiber...the 'shell' of threaded BB, BB30 and PF30 can be 'identical' It is the ID of the shell that is different for each. For metal bikes, like steel, Ti and Al, shell diameter is normally different. This is because metal isn't molded like carbon...carbon promoting a ball shaped shell for all types of BB.
I covered all of this earlier in the thread including pictures.