Oh, and you don't need to buy a Dura Ace 7700 or 7710 bottom brackets to mate with your Dura Ace crank arms. They can get to be pricey. You can get lower tier Shimano Octalink BBs as well. I can't recall which tier it was ("105"?), but I bought one for like $25 once. So, they are (were) out there. Performed just fine. I think they may weigh a bit more (some small amount).