aero bikes

I have a Cervelo P4 (ala 2011 or so.) I need a new bottom bracket. I looked everywhere but cannot determine the exact replacement. Can anyone help me? I believe the length is 68/73 mm, but am not sure of that. There are so many options I find it all confusng. Thank you in advance.

I just built the Ultimate Road Bike Buyer's guide for a bike shop called The Racery in St. Paul, MN. If you are starting your search, this guide will make you feel ready to start looking for your next New or Used Road Bike. It is over 5100 words long, is really detailed and is hopefully super...