Originally Posted by Steev

What they're trying to you is that you select a bottom bracket to match the crankset you are using.
In the case of the Origin 8, you need a square taper bottom bracket with a 103mm spindle length (assuming you want 42mm chainline). Info taken from here.
http://harriscyclery.net/itemdetails.cfm?ID=2672
The only other thing is the bottom bracket shell width and threading, which is probably 68mm English threaded.