I know this has been posted before, but I just wanted to clarify...

I picked up an origin 8 crankset, which says to use 107mm for the BB. From what I've read on some posts, this is a mistake? I should be using 103?

I'm fairly new to this, so I'm trying to make sure I get this stuff right. The guy sold me a 107 BB to fit the crankset, now I'm not so sure.