Spec OSBB to BB30

lochindaal

I have a Venge 2014 that has the Spec OSBB. As I understand it I need to put in spacers or cups to make it work with my FSA BB30 (I don't want to change to Shimano via Praxis or it means changing my power meter crank as well).

I can't find anywhere what spacers/cups should be used? Any help appreciated.