Originally Posted by
xenologer
the Frame uses a BB30
adapters consist of a diameter reducing sleeve that fits into the BB30 bearing, so a crankset with a smaller axle (like the shimano) will fit.
the adapter does not change the fact that the bottom bracket itself remains a BB30, with any perceived creaking tendencies unchanged
you cannot change the frame to use a different type BB, the adapters only change Crankset compatibility, not Bottom Bracket compatibility
No, all frames Do Not have the same standardized BB shell
quit thinking about changing to a different type of BB, you're stuck with it.
I'm thinking the OP is more confused than before with this bit of info.
A bb shell is just that, only a shell. It is a bottom bracket if it includes bearings suitable for a specific crank spindle.
BB30 shells can be converted to "other" style bottom brackets with shell inserts like those sold by FSA and SRAM/Truvativ. Once installed in a BB30 "shell" they will accept a standard BSA outboard bearing bottom bracket.
I don't know this for sure but possible Kestrel is using something similar which would allow them build only one frame style, which would accept the BB30 standard bearings and crank spindle, or with the use of shell insert would utilize a BSA bottom bracket. It sounds like from their literature and component use, this is how it works.