Nose is close to the ground trying to pick up the scent of a company that sells steel sprockets for the Busa. Just got off of the phone with Drive Systems in Huntington Beach California. Quick and short of it: "you are wasting your time trying to find a 530 pitch steel sprocket for the Busa"..He said guys who are running the BST don't want the gyroscopic effect of a rotating steel mass to counter the advantages of the carbon fiber wheels...period...end of sentence...and then like a gentleman whose knocked you down..extends his hand to help you back up..he says, what you want is an anodized alloy sprocket. He told me to stay away from the Vortex because they are too soft. He said good luck trying to find them though. Aarrgghh!!