Originally Posted by LongIslandTom

To use BB30 bottom brackets and cranks, one needs a frame built with a BB30 bottom bracket shell. It will not work with a frame with English-threaded 68mm BB shell.

Those eBay items you linked to are actually three very different Bottom Bracket / Crank systems, and their components are not interchangeable / compatible with each other.

The Campy Veloce bottom bracket you linked to is an internal bottom bracket and intended for use with three-piece cranks. The bearings are inside the the BB's central housing that sits inside the bike frame's BB shell.

The SRAM GXP bottom bracket you linked to is an external-bearing bottom bracket, where the bearings are outside of the bike frame's BB shell. It will only work with SRAM/Truvative/Bontrager 2-piece stepped-spindle road cranksets.

The Campy Record 11 crankset you linked to is also an external-bearing 2-piece system I believe. It will only work with Campy external bottom bracket cups like these: http://www.amazon.com/gp/product/B00...M0EYG255WH89BV

So remember you are not only buying a bottom bracket-- You are buying into a particular BB / Crank system.