I have a Cervelo S2 and with my saddle all the way forward I am still not able to get knee over pedal....
Thanks for any help
Your frame has a 73 degree seat angle, and a seatpost with little rear offset, so you shouldn't need any extreme measures to get your knee over the pedal.
Unless there's something else going on, or you're not correctly measuring correctly you shouldn't even need to go to the most forward seat position which would make for a fairly steep effective seat angle. Have a knowledgeable friend observe your riding position and help you diagnose your problem. Or post a broadside photo of you on the bike.